CaH4e3 page

Mostly Unpublished Game Boy Cheats ;)

generic cheats	-	342
unique cheats	-	324
buried secrets	-	288
fixed generic cheats	-	121
unverified games	-	18
games with secrets	-	665
games with no secrets found	-	417
overall progress	-	~98% done

2nd Space (Unlicensed, Sachen 4-in-1 Vol.6)

(UNI) Stage select (added 10.05.16):
At the title screen, when message "PUSH START" appears, press Down + A + B + Select. Now, and the Stage number screen press Left or Down to select any level.

(BUR) Game genie (added 10.05.16):

052‑A5F‑E66+B92‑A4F‑4CE

Re-enables the unused "Mega Duck" logo at the game boot.

3 Choume no Tama: Tama and Friends - 3 Choume Obake Panic!!

(GEN) Sound test:
After the boot up, before the initial copyright screen appears, hold Up + Start, then wait for the title screen.
Source: urawaza.in

4-in-1 Fun Pak

(UNI) Easter egg:
After the boot up, starting from the second screen after the license, the program start counting the Select pressings. Press it 60 times to see a mini-gallery from the developers. The counter is reset between different intro screens, the better time to enter this cheat is the title screen.

A-Force (Unlicensed, Sachen 4-in-1 Vol.6)

(BUR) Unused cheat:
At the title screen, press Select, A, A, B, B, Down, Up, Left, Right, Select. The new game is starting immediately. There are no other effects except a sound effect, which seems immediately overwries with the new game start sound.

(BUR) Game genie (added 11.05.16):

6E7‑608‑E6A+637‑5F8‑B34

Re-enables somehow the unused "Creatronic" logo instead of the stage screen. Due to lack of proper initialization code, it need more hacking to properly display without glitches during the game.

A-mazing Tater (USA), Puzzle Boy II (Japan)

Japanese version:

(FIX) Secret passwords (added 10.05.16):

MAR10W0RLD	-	SFX test. Press Up or Down to select, press Left or Right to play.
KAMEMASTER	-	BGM test. Press Up and Down to play throught the music tracks.
ARA1HELMET	-	Credits.
WVMP8UXNM9	-	Secret extra hard level.

Source: makainyumon.web.fc2.com

Adventure Island (USA), Takahashi Meijin no Bouken-jima II (Japan)

(GEN) Stage select:
At the title screen, after a while, press Right, Left, Right, Left, A, B, A, B.
Source: gamefaqs.com

(BUR) Game genie:

066‑9BF‑E66+E46‑9AF‑4CB	-	Replace Stage select cheat with Area select. You could start from any sublevel or enable invincibility.
076‑9BF‑E66+656‑9AF‑4CB	-	Replace Stage select cheat with Mode select. You may start any of 10 main game events, except 0A event, which is Stage select itself replaced already.

Adventure Island II: Aliens in Paradise (USA), Takahashi Meijin no Bouken-jima III (Japan)

(GEN) Secret passwords:

1984	-	All levels, 99 of everything.
0894	-	Get 99 of everything.
1231	-	Stage 1-1 Coastal Clash, 99 of Diamonds, 3 lives.
5915	-	Stage 1-1 Coastal Clash, 99 of Axes and Boomerangs, 3 lives.
7265	-	Stage 2-1 Bottomless Pit, 99 of Spades, 3 lives.
4416	-	Stage 4-3 The Desolation and 4-4 Pyramid Crypt, 4 of every item, 3 lives.

Source: gamefaqs.com

(BUR) Game genie:
There is a powerful debugging mode and menus to test various parts of the game left inside the game. Can be re-enabled by setting address 0xD430 to 8 and 0xD431 to 0 respectively. The two-digits number will appear next to the PASSWORD string. Enter a number and press Start to jump to the corresponding part of the game. Or press B to enable invincibility. The number FF will bring the Test menu. Unfortunately, the font encoding is different here from the rest of the game, so you can't see an actual text without additional hacking.
Source: tcrf.net

Adventures of Lolo (USA), Lolo no Daibouken (Japan)

All versions:

(UNI) Easter egg (added 27.08.18):
While ending credits is displayed, press A or B to increase or decrease the amount of fireworks on the backgrounds. Minimum is 1, maximum is 10.

(FIX) Stage solution:
During the game, do not press any buttons for 1 minute in the Japanese version or 1.5 minutes in the US version to get Lolo to fall asleep. Wait for another 30 minutes in the Japanese version or just 5 minutes in the US version and then the message window "WHAT AN IDEA!" will appear prompting you to "execute flash of idea". Agree and computer will show you how to solve current puzzle. To see this hint again you need to wait one more time.
Source: gamefaqs.com

Japanese version:

(GEN) Centryland cheats:
At the Centryland screen press one of the following sequences to get a corresponding effect.

Select, B	-	Sound test.
Select, Select, B	-	Stage select.

Source: gamefaqs.com

(BUR) Game genie (added 27.08.18):

010‑51B‑2A2

Re-enables debugging feature. Before the level starts, while program is waiting for pressing any button, with this code press Start a number of times corresponding to the desired effect then press any other button.

1 time	-	Play previously recorded replay data.
2 times	-	Begin the game with recording of replay data.
3 times	-	Play hardcoded replay data to completely solve current level.
4 or more times	-	Complete current stage instantly.

Adventures of Rocky and Bullwinkle, The

(UNI) Secret message:
In the first level, stand on top of one of the 6 "Frostbite falls" poles, then press Up + B + Select + Start to change the signs to one of the corresponding developers names: "KEVIN", "KATHY", "MARK", "GLEN", "DAN" and "TAK TAK TAK". The effect of this is permanent, even if you lose a life, all "Frostbite" tablets will display the last name you uncover.

Aerostar (USA), Aero Star (Japan)

(UNI) Super hard mode:
Complete the game on the Hard mode. At the screen with "THE END" hold Select and press Start. A message "CHALLENGE SUPER HARD MODE" will appear. This cheat is working in the Japanese version, but there are no text due to bug. However it can be fixed with the Game genie code 3CF‑808‑E6A.

(BUR) Game genie:

FAD‑C8E‑E65 (for the Japanese version)
FAD‑DDE‑E65 (for the US version)

Re-enables "STGAE SELECT" (yes, with wrong spelling) cheat. At the title screen, hold Select, then press Start.

After Burst

(GEN) Self destruct:
On pause, press A + B.

(UNI) Extra 255 lives in 1P VS mode:
At the title screen, put cursor to "PASSWORD", hold Down, then additionally hold Left + A + B.

(GEN) Secret passwords:

19640813

Stage select. The password is a clearly someone's birthday.

Source: urawaza.in, makainyumon.web.fc2.com

Akazukin Chacha

(FIX) Secret passwords (added 11.08.16):

あかいかみのまほうつかい	-	Easter cutscene with some character, then return to the title screen. Seems does nothing.
ちかにひみつのめいろあり	-	A Special Birthday Party dungeon. You'll start at the empty town, find a hole in Laboratory, play this special dungeon and find a birthday party room, following with the Staff roll.

Source: urawaza.in, makainyumon.web.fc2.com

Aladdin

(FIX) Level skip (added 04.05.16):
Pause the game, then press A, B, B, A, A, B, B, A. This is the only cheat in the Game Boy Version on pause, the same as in the NES version.
Source: gamefaqs.com

Alien vs Predator: The Last of His Clan (USA), Alien vs Predator (Japan)

(UNI) Level skip (added 05.05.16):
During the game, press Select to enter the Weapon menu, then press Up, Up, Down, Down, A, B, A, B. Press Select again to complete current level instantly. This only work up to level 6.

All-Star Baseball 1999

(UNI) Scores edit mode (added 06.05.16):
Choose any game mode, when the "Team Options" menu is displayed (no matter if you enter this menu before the game, or during the game by pressing Start), then press Up, Down, Left, Right, Up, Down, Left, Right plus any other button to complete the sequence. A sound will confirm correct code entry. Now, start a game in any mode, enter the "Team Options" menu by pressing Start and enter the "Scoreboard". By pressing Left or Right choose current inning, press Up to increase scores of upper team, or Down to increase scores of bottom team. Also, for the game modes "Playoff" or "Season", when you quit with the higher scores than your opponent, you'll instantly win a current game and the result will be saved in the password as well, as against the normal game without cheat, which is threated quitting as a loosing current game all the time, not mater what you current score is. Repeating this process you can win the entire game in no time.

Amazing Penguin (USA, Europe), Osawagase! Penguin Boy (Japan)

(FIX) Secret passwords (added 08.05.16):
To enable these secret passwords, at the title screen hold Left + A, then enter the Password entry screen.

A0A0A0 (for the Japanese version) 101010 (for the US version)	-	Enables invincibility.
F0F0F0 (for the Japanese version) 303030 (for the US version)	-	Stage select. There are two numbers appear right to the "START" option at the title screen. You can select any of 40 level.
B0B0B0 (for the Japanese version) 505050 (for the US version)	-	Sound test. Select between music and sfx by press B, use D-Pad to select sounds, press A to play.

Source: makainyumon.web.fc2.com

Amazing Spider-Man, The

(BUR) Game genie (added 09.05.16):

633‑6DF‑7F0+B53‑6CF‑6E9+CD3‑6BF‑5D4

Re-enables the Stage select after the title screen. Valid values are 0-7. Use Left or Right to select, press A to play.

America Oudan Ultra Quiz

(GEN) Easter egg (added 12.08.16):
At the title screen, press B + Select to make the animated plane's picture little bit smaller. The meaning of this is unknown, but there are no other effects of this.
Source: makainyumon.web.fc2.com

(GEN) Mini-game instant win (added 18.05.16):
After the qualify stage, when you play the Rock-Paper-Scissors mini-game in Narita Airport, hold Down + Select + Start before or immediately after A is pressed to instantly win the current round.
Source: makainyumon.web.fc2.com

America Oudan Ultra Quiz Part 2

(UNI) Qualify quiz hint (added 19.05.16):
Hold Down + Right + A + B + Select before the title screen appears, either at the game start-up of after the game over screen. Now, in the quailfy quiz event (during the flight from Norita airport to USA) you can hear if you answer correct or incorrect, as against the regular game mode with completely silent answering in this event.

(BUR) Game genie (added 19.05.16):

012‑9FF‑E6A

Enables a couple of debug features. First, this will skip the starting qualify events and jumps directly to the main game map. Also, in addition to extra variables display at some game events, it will add two more button combinations to hold before the title screen appears, the same way as for working cheat.
Hold Up + Left + B + Select + Start to see all the 3-answer questions after the game start.
Hold Up + Right + B + Select + Start to see all the yes/no-answer questions correspondingly.

America Oudan Ultra Quiz Part 3: Champion Taikai

(UNI) Secret passwords (added 20.05.16):
There are a special mode in this game: "Champion Taikai", which asking you a passwords to access it. It seems, they are released during some kind of competition in Japan and maybe well known there.

ジャストめっと	-	HAWAII event warp.
ジャストみっと	-	GAME event warp.
ジャストもっと	-	ROCKY event warp.
アメよこクイズ	-	"RAIN OF QUIZ" game.

(BUR) Debug passwords (added 20.05.16):
The password system mentioned above were also used for debugging purposes at the developement stage. The password list contains 28 passwords, only 4 are used in game, the rest is disabled. Using the Game genie code 01F‑FCC‑E6A you may re-enable them, so all following passwords will be available. It includes most of the ingame events as well as debug-only routines and sound test.

まるばつ	-	type 2 quiz debug
さんたく	-	type 3 quiz debug
じゆうのめがみ	-	type 1 quiz debug
なりた	-	NARITA event
グランド	-	GRAND CANYON event
じらい	-	GAME event FIELD RUN mini-game
サンフラン	-	SAN-FRANCISCO event
チキン	-	GRAN CANYON event RACING mini-game
ビス	-	BOSTON event
ヘルス	-	BOSTON event MOTO mini-game
マイ	-	MIAMI event
タコ	-	MIAMI event POT mini-game
ニュウ	-	NEW-YORK event
チュウンサン	-	HAWAII event FIELD mini-game
チュウンシ	-	HAWAII event TRIVIA mini-game
かない	-	ON THE PLANE event
サメ	-	SAN-FRANCISCO event FISH mini-game
スケエト	-	ROCKY event SKATE mini-tame
エンド	-	Ending
チャネ	-	Winning slideshow
おと	-	Sound test
ずる	-	Always win
アイキュウ	-	+ 48 iq (used to see all endings for IQ=0/40/80/120)
ドオム	-	DOME event

America Oudan Ultra Quiz Part 4

(GEN) Flight Quiz Hint (added 10.01.17):
At the beginning of the game, there is a qualify quiz during flight from the Norita airport to USA. You were asked 20 questions, but there are no buzzers for the answers results. But, if you notice, there a small character at the middle-top of the screen. When you answers, he raise its right hand if answer is correct and the left hand in other case, so you may know for sure if the answer correct or not.
Source: urawaza.in

(FIX) Debug passwords (added 10.01.17):
The password system consists of 2 rows of 3 characters, there are 6 different characters. Let's number them from 0 to 5:
0 - "rock"
1 - "scissors"
2 - "paper"
3 - "O"
4 - "X"
5 - "right arrow"
The default password on the password screen is:
0,1,2
3,4,5
If you press A, you will increase the character index, and decrease if press B.
Now, the regular passwords are depending on the name you entered before the game and difficulty setting, to restore the game with a password you must enter the correct name for it first and set the correct difficult.
There are a set of debug passwords for the "ULTRA QUIZ" mode only and not depending on the difficulty settings, which allows you to access every single event in the "ULTRA QUIZ" game, excluding maybe the ending. To use them you must enter the special player's name: "TOMY". If you enter this name at the beginning of the game, you'll get the same debug passwords, while moving to the next stage, but not all of them. The complete set of debug passwords is in the table below:

5,5,5 5,3,1	-	hawaii event
3,3,4 1,2,5	-	alligator battle
5,4,3 4,4,1	-	haunted houses
1,1,2 4,4,3	-	baseball second chance
5,5,2 2,2,2	-	crane machine
1,1,4 5,5,5	-	basketball
3,4,3 4,3,4	-	catch chicken
5,1,5 0,5,2	-	rock-paper-scissors
2,3,5 5,2,5	-	museum
5,3,0 3,3,3	-	skiing
0,5,4 0,5,0	-	balloon fight
1,2,5 1,2,5	-	shooting range
2,3,4 3,4,2	-	tv-show
3,3,3 3,3,3	-	flight quiz Source: urawaza.in
0,0,2 2,2,5	-	title screen (hanging the game)
5,2,2 1,1,3	-	continue screen

Amida

(UNI) Debug menu:
Hold A + B + Select then reset the console. At the white screen press Right, Left, Up, Down.

Animal Breeder

(BUR) Game genie (added 26.05.16):

0C1‑1BE‑E6A

Re-enables the Message debug mode at boot up.

Animal Breeder 2

(UNI) Any creature select (added 28.05.16):
At the title screen, press Right + B. A sound will confirm correcct code entry. Now, start a new game and you'll be able to select any creature to grow instead of 8 predefined characters.

(UNI) Full creature library (added 28.05.16):
At the title screen, press Left + B + Select. A sound will confirm correcct code entry. Now, during the game you'll be able to see any character's info in the library.

Animaniacs

(GEN) Secret passwords (added 31.05.16):
A numbers represents one of the characters: 0 - empty, 1 - Yakko, 2 - Wakko and 3 - Dot

0,1,2 3,3,3 0,1,1	-	Level Skip. Pause the game, then press Select.
0,0,3 3,3,2 1,1,1	-	Unlimited Lives.
0,1,3 1,3,3 1,3,1	-	Unlimited Energy.
0,1,3 2,3,3 1,0,1	-	Unlimited Time.
0,3,3 3,3,1 1,1,1	-	"Negativ Cheat". Makes two midbosses of the Stage 2 very difficult, increasing its projectiles throw rate half of the minimum threshold.

Source: Factor 5

Another Bible

(BUR) Game genie (added 01.06.16):

C8A‑D28‑C4D

Re-ebanles a debug cheat. At the title screen, first select one of the debug modes described below by pressing Select.
A number of pressings corresponds to the desired function and wrapped around 8, but actally different modes are 5.
When done, press Up, Down, Left, Right, B, B, Up, Down. A sound will confirm correct code enrty. Now during the game use selected options to debug various parts of the game.
All debug modes uses different set of debug flag bits, but the bit 7 is set for all modes:

Function 0	-	Bit 7 is set (default).
Function 1	-	Bits 7 and 2 are set.
Function 2	-	Bits 7, 2 and 0 are set.
Function 3	-	Bits 7, 2, 1 and 0 are set.
Functions 4-7	-	Bits 7, 3, 2, 1 and 0 are set.

The following list describes the meaning of each bit:

Bit 7

Commong debug features in all game modes:

In Map mode	-	Start - switch to Town mode. Select - next map. Down + Select - previous map.
In Town mode	-	Start - switch to Map mode. Select - next town. Down + Select - previous town.
In Battle mode	-	Start - skips the battle Select - next location background.

Bit 3

All items in any shop.

Bit 2

Skip enemy move in Map mode.

Bit 1

Extra 68000 gold at the beginning of the new game.

Bit 0

All characters at the biginning of the new game.

Ant Soldiers (Unlicensed, Sachen 4-in-1 Vol.7)

(UNI) Ending (added 13.05.16):
At the title screen, hold A, press and release B twice, release A, hold B, press and release A twice, release B, finally press Start.

(UNI) Level skip (added 14.05.16):
During the game, press Start to pause then hold A, press and release B twice, release A, hold B, press and release A twice, release B.

(BUR) Hidden text (added 13.05.16):
There is a hidden version number string at the beginning of the ROM:

93/06/03VER:002

Source: tcrf.net

Aoki Densetsu Shoot!

(FIX) Secret passwords (added 02.06.16):
Every character in the password has an index. The first character Kenji has index 0, the last character Kazumi has index 12. The default state of password is 00,00,00,00. To enter these passwords, you need to set it to default state and press Up a corresponding number of times to set the particular character in corresponding position.

00,09,08,02	-	Secret team match (Level 5)
12,12,12,12	-	Slideshow of the Kazumi character's cutscenes. Source: urawaza.in

(BUR) Game genie (added 02.06.16):
The password system has 5 more "Slideshow" passwords for diferent characters, but they are disabled by setting the incorrect values to the password list. By restoring them using following Game genie codes you may see rather unfinished or maybe boring thus disabled slideshows.

093‑E8B‑6E7	-	Use password "09,09,09,12".
003‑ECB‑6E7	-	Use password "00,00,00,12".
083‑F0B‑6E7	-	Use password "08,08,08,12".
0B3‑F4B‑6E7	-	Use password "11,11,11,12".
003‑FCB‑6E7	-	Use password "00,09,08,12".

(BUR) Game genie (added 02.06.16):

05F‑DCE‑E66+05F‑F0E‑E66

Re-enables two hidden menu items at the title menu. One is for Cutscenes debug menu (using the same text as for Settings menu). Another is for Field viewer, but with incorrect CHR data setting.

Aretha II

(GEN) Easter egg (added 28.02.17):
At the title screen with the bubbles floating, hold either Left or Right to control the direction of the bubbles flow.
Source: urawaza.in

Aretha III

(GEN) Sound test (added 04.02.17):
One of items that can be found in this game called "Aretha CD" and when used enables a Sound test. Investigate, where is to buy this particular item.

Asmik-kun World 2

(GEN) Secret passwords:

RDEST???	-	Even if the passwords for Stage 4 is written by the game, they aren't work by itself, only available with this additional password, but other passwords are disabled instead, when it is used, with one exception (see below).
EVE?????	-	Event viewer.
MAP?????	-	Debug menu. The only password available when using an extra password RDEST??? as well.
SOUND???	-	Sound test.

Source: tcrf.net

Asterix

(GEN) Cheat menu (added 03.06.16):
During the game press Start to pause it. Then enter following code Up, Up, Up, Up, Up, Up, Up, Up, Down, Down, Down, Down, Left, Left, A, B, Right, Right, Right, Right, Right, Right, Right, Right, Left, Left, Left, Left, Up, Up, B, A. A sound will confirm correct code entry, then press Start and game will return to the title screen with extra "cheat" menu item.
Source: gamefaqs.com

(UNI) Invincibility (added 03.06.16):
Input the Cheat menu code as described above, but before pressing Start to return to the main menu, hold Up + Right + A + B + Select. Start a new game with any cheats as you wish and press Start to pause it again. Enter the Cheat menu code one more time. A sound will confirm correct code entry. Press Start to unpause the game. From this point you will be fully invulnerable.

Asterix & Obelix

(GEN) Stage select (added 03.06.16):
At the title screen, press Left, Left, Left, Left, Right, Up, Up, Down, Select, Right, Right and listen for a sound. A Stage select will now be added to the Options menu.
Source: gamefaqs.com

Asteroids, (Single game cart, Arcade Classic No. 1)

(GEN) Invincibility (added 04.06.16):
At the game mode selection screen, press B, A, A, B, A, B, B, A, B, B, A, B, B. This cheat also work on Arcade Classic version.
Source: gamefaqs.com

Atomic Punk (USA), Bomber Boy (Japan), Dynablaster (Europe)

(UNI) Sound test (added 05.06.16):
In the GAME A (BOMBER BOY for the Japanese version) mode, at the Stage select screen, enter MY TOWN with Right + A + B + Select held. Note: when you press Right, the selection on the map is changing, so you can either press Right first and hold it when stop on MY TOWN and then hold the rest of the buttons, or just put cursor to the previous position to MY TOWN before holding all the buttons.
Source: tcrf.net

Attack of the Killer Tomatoes

US version:

(GEN) Credits (added 06.06.16):
At the title screen, press B to see a credits. There is no such function in the Japanese version.

(UNI) Cheat mode (added 06.06.16):
At the title screen, hold Up + Select, then press B, B, A. A title music should stop as well as the tomato face animation. Now, press A a number of times corresponding to desired level number, the title music will restart every time you press a button. Or press B once (hear a sound) to enable invincibility (flashing mode). Press B one more time (hear another sound), to additionally get an infinite lives and all items at start. Althought this is not disables invincibility, this will disable flashing. Press Start to begin a game with a selected cheat options at the desired level.

Japanese version:

(BUR) Cheat mode (added 06.06.16):
The Japanese version seems simply is an early version of this game, so they just didn't coded the cheat input at all. But, there are the same variables controlling the cheat states already coded and working. Set the RAM address $C677 to non-zero value to enable invincibility, additionally set $C676 to non-zero value to enable infinite lives and get all items as well.

Avenging Spirit (USA, Europe), Phantasm (Japan)

(GEN) Expert mode (added 07.06.16):
This code is unlockable in the Japanese version. If you beat the regular game, there will be a screen with instructions how to enable an Expert mode. If you beat the game on the Expert mode there will be additional ending screen. Both screens were removed in the US version, but the Expert mode still can be enabled the same way: at the title screen, press Up + A + B. A sound will confirm correct code entry in both regional versions. Additionally in the Japanese version, a message "EXPERT" will appear at the bottom-left corner of the title screen.
Source: gamefaqs.com, unlockable

(GEN) Bad ending (added 07.06.16):
At the title screen, press Down + B + Select. A bad ending happens if you beat the game as a regular haunted character.
Source: gamefaqs.com

(UNI) Good ending (added 07.06.16):
At the title screen, press Down + A + Select. To get a good ending normally you must find three keys hidden in various levels and open the door near the end of the last stage where your girlfriend is imprisoned.

(UNI) Easter egg (added 07.06.16):
During the intro cutscene, hold Up before the 4th screen with a screaming guy appears. The text line "ガチョーン" will appear on the screen in both the USA and the Japanese versions, which means this is just a leftover from the Japanese version not removed in the US version. The text line is an obsolete Japanese word to express shock (gaccho~n).

Babel no Tou (Namco Gallery Vol.3)

(FIX) Pro babel (added 18.12.21):
At the title screen, press Up, Up, Up, Up, Up, Up, Up, Down, Down, Down, Down, Down, Down, Right, Right, Right, Right, Right. The title color will change. Now you will play another set of harder pussles. This is unlockable code given after completing the regular mode game (you must reveal and input the final password as well).
Source: gamefaqs.com

(FIX) Unlock final passwords (added 18.12.21):
Every 8th stage in this game is a special stage. There are no regular puzzles nor prizes but there is something different. In these stages you must solve a puzzle involving some button pressing or holding or positioning the ladders to obtain one of the 8 symbols. Using these symbols after completing the 64 stage as a password you will get the real ending. Not sure anybody can do it by yourself just via trial and errors approach. Here is the complete list of the password revealing methods for all special stages made by reverse engineering instead. After completing the regular mode with this pass, you'll get the PRO mode cheat code for the title screen. After completing the PRO mode with this pass, you'll get the real ending. Need to mention, all these codes are exactly the same as in NES version of this game.

Stage	\|	Activation Method	\|	Picture
Regular 8	\|	At the beginning of the room, press and hold Up + Right. When reach 3rd statue the picture will appear.	\|	Valkyrie
Regular 16	\|	Press and hold Right and wait.	\|	Ship
Regular 24	\|	Get a stair and walk to the right wall, continue holding Right against the wall until the picture appears.	\|	Pac-Man
Regular 32	\|	Go left while holding Down button. Continue holding Left + Down and walk against the left wall until picture revealed.	\|	Triangle
Regular 40	\|	Go to the left wall, press and hold Left + Up against it and wait until picture revealed.	\|	Scoprion
Regular 48	\|	Go left, move both stairs against the wall to the left to form one high ladder, climb it and touch the wall at the upper point.	\|	Worm
Regular 56	\|	Get the stair and in any place just hold Down and wait.	\|	Lucky Cat
Regular 64	\|	Get rightmost stair and put it against the right wall, climb and touch that wall. Return stair to the middle of the screen, get to the left side using upper stair. Now get leftmost stait and put it against the wall above the exit door. Climb up and touch the left wall at the upper point of stair.	\|	Aircraft
Pro 8	\|	Go right to the 4th figure on the background, stand against it and press Up. Go left and do the same at the very first figure, then return back to the 4th one and press Up again.	\|	Pac-Man
Pro 16	\|	Just go left and hold Left against the wall until picture appears.	\|	Triangle
Pro 24	\|	Get stair and at any position press Up 10 times.	\|	Ship
Pro 32	\|	At any point just hold Up and wait.	\|	Valkyrie
Pro 40	\|	Get three stairs and put them in a ladder that ends above the exit door, then climb on top of it.	\|	Aitcraft
Pro 48	\|	Go right, get the rightmost stair and put it against the right wall. Climb and touch the wall. Do the same with another stair but against the left wall.	\|	Lucky Cat
Pro 56	\|	Just hold any button except Select and Start for about 10-20 seconds.	\|	Worm
Pro 64	\|	At this point you must have only 1 live. In this case, press B 28 times to reveal the last picture.	\|	Scoprion

Bakenou TV '94

(UNI) Race cheat (added 15.06.16):
At the title screen, press Up, Up, Up, Up, Up, Up, Down, Down, Up, Up. Start a new game and you'll hear a different sound if cheat is enabled. Don't know exactly, what it's doing, but every race results will be slightly different from the regular ones (higher values in the results lists, etc.). Need investigation.

Bakenou V3

(UNI) Race cheat (added 15.06.16):
At the title screen, press Up, Up, Up, Up, Up, Up, Down, Down, Up, Up. Start a new game and you'll hear a different sound if cheat is enabled. Don't know exactly, what it's doing, but every race results will be slightly different from the regular ones (higher values in the results lists, etc.). Need investigation.

Bakuchou Retrieve Master

(BUR) Game genie (added 15.06.16):

201‑71F‑91E

Re-enables the complex debug menu at game boot.

Source: tcrf.net

Bakuchou Retsuden Shou: Hyper Fishing

(GEN) Cart RAM clear (added 23.02.18):
Before power the console on, hold Up + Left + B.

(GEN) Ending (added 23.02.18):
At the data load screen, choose the "LOAD" option, while choosing a data slot hold Up + Right + Start and press A.
Source: urawaza.in

(UNI) Catch screen cheats (added 26.02.18):
All these test are enabled the same way. During the game, select any empty map tile, press A and choose a second option in the menu "ちょうか" ("A catch"), then select an option "かこのきろく" ("Previous records"). Press Start a number of times particular to desired effect (see the table below) and press A.

5 times	-	Sound test. Source: urawaza.in
8 times	-	"Live well" viewer. View fish pictures and info in the "ライブウェル" ("Live Well") list if any. Note, scenarios for Stages 5, 8, 9 and 10 does not have such events, so you'll see a corresponding warning message instead.
9 times	-	Previous Records viewer. View fish pictures and info in the "かこのきろく" ("Previous records") list if any.

(UNI) Debug mode (added 23.02.18):
At the Star-Fish logo, quickly press Select, Up, Down, A, Left, Start. Similar Debug modes can be found in some other games by the same developer (Starfish). When the screen fades out, a message "DEBUG MODE / DEVELOPMENT STUFF ONLY" will be displayed. At this screen, hold Select and wait until the "DEBUG MENU" screen appears. You can access this menu during the game by holding Select at the beginning of some events or while in transition between game screens. This also enables the debug info display in the Fishing mode after you leave "DEBUG MENU". In "DEBUG MENU" you can to access a Sound test, characters/battle/land editors, begin the game from any stage, clear CRAM data, view all game messages, or level up any character.
Other debug features (incomplete list):
Any time during the game, hold Select and press Start to pause it, press Start again to unpause.
At the Stage name screen, hold Start + Down before the screen fades out to skip the cut-scene.
At the action select menu, before selectin the "MOVE" option hold Select to be able to move any available zone on the current map.
During the NPC turns, hold Select to speed-up the process.
During Casting mode, hold Start before either throw, bait display or fish catch to instantly catch a Bass. Note, even with this debug trick you couldn't catch anything with wrong equipment, bait or low experience.
At the Casting techniques selection, put cursor to the desired option with Down and hold it, then press Start. Use Left/Right to choose technique level up to max possible.
During Reeling mode, press Start either with one of D-Pad buttons held or not to begin one out of 5 incidents which usually occurs randomly depending on the environment settings.At the game field, hold Select, then press one of the following buttons to get the corresponding effect.

A	-	If character is selected, the unit's general and private indexes will be displayed. If ground tile is selected, display rivals overall statistics.
B	-	Displays a current event name.
Up	-	Enter the Catch lists editor. Choose a fish to be catched. Set its max weight up to 5,1K with Left/Right. Press A to silently update the Recent records entry for this fish or press Start to display a regular Catch screen with information about fish and experience update. The first two positions in the list are Basses, so they will go to "Live Well" list also. The second to last option is for clear all catch lists and the second one is for clear only Prevoius Records list.
Right	-	Show some kind of timers list depending on Bass catches.
Down	-	If player's character is selected, resets its "End of Turn" state.

Banishing Racer

(GEN) Invincibility (added 15.06.16):
During the game, on pause, hold Up + Select, then press A + B. A "PAUSED" string will change to one of the messages: "Run^2" or "Jun^2", as well as the sound will be heard. This cheat works only for current level and you still may be hurt by the spikes or by the bosses.
Source: makainyumon.web.fc2.com

(GEN) Stage select (added 15.06.16):
At the title screen, hold Down, then press A + B a number of time corresponding to desired level number, for every press will hear a sound. Press Start to play. More than 15 pressings shows the ending.
Source: urawaza.in

Batman

(GEN) Sound test (added 19.06.16):
At the title screen, hold Up + Right, then press Start.
Source: gamefaqs.com

(FIX) Level and weapon select (added 19.06.16):
Beat the game once, then at the title screen press Start to begin a new game, but before the title screen disappear, hold Select. Additionally, when the final message of the credits roll "THE END" appears, hold Select and wait for the title screen. This will also enable a Weapon select mode. During the game press Select to cycle between all possible weapons.
Source: urawaza.in, unlockable

(UNI) Batwing shot rate select (added 19.06.16):
During the Batwing stages (3-1, 3-2), press Start to pause the game, then press B, Up, Select, A. Now, you need to input a 4-button sequence, which will be treated as 4-bit binary number, which is representing a desired shoot rate when you hold A during the game. Any buttons except A means binary 0, the A button means binary 1. Lets use for the binary 0 the B button, then we can write down all possible valid codes in the table below. So, the best complete button code of this pause cheat for fastest shot rate is B, Up, Select, A, B, B, A, A. Now, just unpause the game.

B, B, B, B	-	Invalid value, set to shot rate 15 (slowest) instead 0.
B, B, B, A B, B, A, B	-	Invalid values, set to shot rate 10 (default, used by the game) instead 1 and 2 correspondingly.
B, B, A, A B, A, B, B B, A, B, A B, A, A, B B, A, A, A A, B, B, B A, B, B, A A, B, A, B A, B, A, A A, A, B, B A, A, B, A A, A, A, B A, A, A, A	-	All valid values from 3 (fastest) to 15 (slowest) correspondingly.

Batman: Return of the Joker

(UNI) Secret bonus (added 18.06.16):
At the title screen, press Left + B + Select. The game will immediately start with a different starting sound, rather than a regular bat wings sound. Now on every boss stage, when the player's health drops below the 3 points, but the boss still has more than 16 health points, the friendly support character will fly over the screen dropping up to 4 heart bonuses. Hovewer, this bonus may be triggered only once for each boss.

Batman: The Animated Series

(GEN) Stage select (added 21.06.16):
This cheat is unlockable after a completing the game. Then just press Select at the title screen to enter the regular options menu.
Source: gamefaqs.com, unlockable

Batman Forever

(GEN) Cheat menu (added 22.06.16):
At the difficulty selection screen, press Up, Right, Down, Left, Up, Left, Down, Right. You'll be able to enable all ammo, no damage modes and select any stage to begin the game.
Source: gamefaqs.com

(FIX) Credits (added 22.06.16):
At the difficulty selection screen, press Up, Up, Up, Up, Down, Down, Down, Down.
Source: gamefaqs.com

Battle Arena Toshinden (USA, Europe), Nettou Toshinden (Japan)

(FIX) Special cheats (added 24.06.16):
All cheats are entered at one of the three screens: the Takara logo, the Ellis opening and the title screen. Some cheats may be used only in Super Game Boy mode. When cheat is entered correctly, an unique sound for every cheat will be heard.

Where to input?	\|	Cheat sequence	\|	Effect	\|	SGB only	\|	Is it unlockable?
At the opening screen with Ellis.	\|	Right, Left, A, B	\|	Gaia and Sho unlocked.	\|	No	\|	Yes. For beating Easy mode.
At the Takara logo.	\|	Select, Select, Select	\|	Scorcher mode. A couple of new special attacks may be used now.	\|	No	\|	Yes. For beating Normal mode.
At the title screen.	\|	Up, Up, Select, A, Down, Down, Select, B	\|	Jet mode. Fastest movement speed for all players.	\|	Yes	\|	Yes. For beating Normal mode.
At the opening screen with Ellis.	\|	Up, Down, A, B, Right, Left, A, B	\|	Gaia, Sho, Gaia2 and Uranus unlocked.	\|	No	\|	Yes. For beating Hard mode.
At the Takara logo.	\|	B, A, Left, Right, B, A, Down, Up, B, A	\|	Text mode. View all text messages for the game.	\|	No	\|	Yes. For beating Expert mode.
At the title screen.	\|	Up, Down, Left, Right, Select, A, Select, B	\|	Both players are now CPU controlled in all modes.	\|	Yes	\|	No. Secret cheat.
At the Takara logo.	\|	B, Select, A, Select, Right, Left, Down, Up	\|	Skip tournament and instantly show the ending for any character.	\|	Yes	\|	No. Secret cheat.

Source: gamefaqs.com

Battle Bull

(BUR) Game genie (added 28.06.16):

209‑10D‑E6A+0F9‑11D‑E6A

Re-enables the debug mode. Gives an extra 99999999 gold, invincibility, and enables the Stage select at the beginning of the game.

Battle City (Namco, Namco Gallery Vol.1)

(BUR) Game genie (added 09.12.18):
There are a couple of debug leftovers disabled in the release version. Both working in "FIX MODE" only, "NORMAL MODE" does not have any debug leftovers.

CA2‑B0B‑E65	-	Press B to instantly exit current stage and return to the stage select screen.
CA2‑D3B‑E65	-	Press Select to force the random item to appear on the field.

Battle City (Nova, Single game cart)

(GEN) Stage select (added 28.06.16):
At the Stage number screen, press Up or Down to choose a level up to 32 by default. When you beat any games above, you'll be able to select it as well. Beat the game to unlock all levels.
Source: gamefaqs.com

(FIX) Cheat sequences (added 28.06.16):
All cheats are entered at the title screen. A sound will confirm correct code entry. Any number of cheats may be entered, all effects are combined.

Left, Left, B, A, Up, Down, A, Right	-	Start with 9 lives.
Down, Up, Up, Down, Left, Right, A, B	-	Unlock all stages in Stage select mode.
B, A, B, B, A, B, A, A	-	Start with level 3 tank.
Down, Left, Up, A, Right, Right, B, Up	-	Options menu. Allows you to select game speed, lives and extend mode, which determines one of two score tables for obtaining a new life.
Right, Up, A, Down, B, Left, A, B	-	Increase number of enemies after Stage 5 on the field at the same time up to 6 (default is 4).
Up, Up, Down, Up, Left, Right, Right, Left	-	Shovel power-up will use a random block.
Up, B, Left, A, Right, B, Down, A	-	Enables an auto-fire.
A, Down, A, Up, A, Right, B, Left	-	Credits, but without unlocking all stages.

Source: tcrf.net

Battle Crusher

(FIX) Special team (added 01.07.16):
At the title screen, when the "PUSH START" message is displayed, press Left, Left, Left, B, A. This cheat also work for a second player in 2-player game either via link cable or with SGB controllers.
Source: gamefaqs.com

Battle of Kingdom

(GEN) Stage select (added 03.07.16):
After the game is boot up, within first 5 seconds while the title screen is displayed, press Down + A + B + Select. During the game, on the map screen press A or B to skip to the next stage. Also this additionally gives to you an extra 9000 gold. Don't forget to buy come cards before entering any fight, or it will ended up with a game over.
Source: urawaza.in

Battle of Olympus, The

(UNI) Cheat mode (added 04.07.16):
During the game, press A, B, B, A, Up, Down, Left, Left, B, A. Now press B + Select to enable the free walk mode. While in this mode, press A to skip to the next location, or Start to exit this mode.

(BUR) Hidden text (added 04.07.16):
At 0x127B5 in the ROM an unused text string can be found:

BOBMAResetLEY%%

Judging from the place, where it located and its format, this may be either a default names for the Hero and Heroine or a secret names.

Battle Pingpong

(GEN) Secret passwords (added 01.07.16):

1199	-	Stop watch minigame. This is unlockable password, given to you after beating the final game with Panda.
4989	-	"NEVER GIVE UP" screen display.

Source: gamefaqs.com

Battle Unit Zeoth, Jet Pack (Prototype)

(FIX) Training mode (added 04.07.16):
At the title screen, hold Down, then press A + B a number of times corresponding to the desired stage from 1 to 5. You will start a new game from the selected level with 240 hit-points instead of 8, so technically you will be invulnerable for some time. But you can't advance to the next stage playing this mode, you can play only the selected level again and again. If you press A + B at the title screen 6 times, you'll be able to see the ending. But the staff roll will be different from one you should see if you beat the game normally, containing additional programmer's message. Also, if using this cheat you'll start a new game after the staff roll with only 1 hit-point and no weapon as against the normal ending, which starting a new game with max power lazer and 8 hit-points.
Source: gamefaqs.com

Beavis and Butt-head

(BUR) Game genie (added 07.07.16):

080‑A2D‑E6E

Re-enables an unused Stage select screen. You'll be able to select any level, including the Mini-game. The last unnamed option in this menu isn't working.

Source: tcrf.net

Beethoven

(UNI) Stage select (added 07.07.16):
During the game, stand still, then press Up, Down, Up, Down, A, A, Up, Down, Down, B. A small number will appear in the middle of game's HUD. Select desired level and press B. Note, that stage indexes are inverted, 0 means the last level, 5 means the first level. The number 6 means the ending screen.

Beetlejuice

(GEN) Stage select (added 07.07.16):
At the title screen, quickly press Left, Right, Up, Up, Down, Down. If you hit the wrong button or pause between two presses more than 1/4 of second, the cheat won't work until you reset the console.
Source: genhoaxer

Best of the Best: Championship Karate (USA), Kick Boxing, The (Japan)

(UNI) Credits (added 11.07.16):
At the main game menu, hold Select, then press Up. The same credits screen is shown when you beat the game.

(UNI) Secret passwords (added 09.07.16):

KUKUM000	-	Weaken the enemy to lowest HP.
TONY0000	-	Invincibility for player.

Bikkuri Nekketsu Shin Kiroku!: Dokodemo Kin Medal

(GEN) Secret team (added 28.02.17):
At the Team selection screen, choose any team, hold Select then press A or Start. The secret 4th team (Oklahoma) will be selected.
Source: urawaza.in

(UNI) Tournament skip (added 11.07.16):
During the game, if you loose one of the first two rounds of any tournament-type competitions, the game for the 1st place will be played by CPU controlled characters. In this case you can skip this unnecessary round, just pause the game, and press Down + A + Select.

(BUR) Unused obj viewer (added 11.07.16):
During the game, pause the emulation and change $C000 and $C001 RAM addresses to $A and $0 correspondingly. This will switch the game in simple debug viewer for currently selected sprites list. This mode does not load an actual CHR data, so you can see only the sprites, loaded by the game previously. So if you enable it during one of the competitions, you may see the complete set of its sprites.

Bill & Ted's Excellent Game Boy Adventure

(GEN) Cheat sequences (added 11.07.16):
All cheats are entered at the title screen, a sound will confirm correct code entry. Cheats can be combined.

Up, Up, B, Down, Right, A	-	Infinite lives.
Left, Right, Left, Right, Up, A	-	Infinite time.

Source: gamefaqs.com

(BUR) Game genie (added 11.07.16):

9A1‑3AD‑E61+6B1‑3BD‑7F3

Re-enables an unused memory viewer function, used at the developement stage for verifying the demo recording data. The demo recording code still present in the game too, but need more effort to re-enable it back.

Bionic Commando

(GEN) Return to map (added 13.07.16):
To return back to the map screen any time during the game, press A + B + Start.
Source: gamefaqs.com

Bishoujo Senshi Sailor Moon

(BUR) Game genie (added 13.07.16):

071‑93F‑F72

Replaces the soft-reset function with a Stage select. Numbers from 1 to 4 are select levels, number 5 should select additional cheat flag, maybe invincibility, but it is never used. Note, that due to hacky method of enabling the Stage select may cause glitches when used.

Black Bass: Lure Fishing (USA), Hyper Black Bass (Japan), Hyper Black Bass '95 Black Label (Japan Rerelease)

(UNI) Sonar mode (added 14.07.16):
At the title menu, put cursor either to the start or to the continue menu options, then press B + Select. A game will start instantly. Now, during catching seqeunces, the DEPTH/LINE parameters will display the fish position near the lure, rather than actual lure depth and line lenght. The values are in range 0.0-5.0. A higher values means that fish is closer.

Black Forest Tale (Unlicensed, Sachen 4-in-1 Vol.6)

(UNI) Credits (added 11.05.16):
At the title screen, Hold A, press and release B twice, release A, hold B, press and release A twice, release B.

(UNI) Restore lives, money and items (added 11.05.16):
During the game, face the character in northern direction, press Start, then press Up + A + B + Select. An extra 9 lives, 111 coins and all powerups will be refilled.

(BUR) Game genie (added 11.05.16):

420‑1AB‑E66+050‑19B‑6EB

Re-enables the unused "Mega Duck" logo at the game boot.

Blades of Steel (USA, Europe), Konamic Ice Hockey (Japan)

(GEN) Sound test (added 15.07.16):
At the license screen in the US version, or at the Konami logo screen in the Japanese version, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A.
Source: urawaza.in

(UNI) Secret message (added 15.07.16):
There are a few of secret messages hidden inside the ending's staff screens. Each message assigned to its own staff screen and has unique method of revealing. Here is the complete list:

Where to find	\|	How to enable	\|	Effects
The "co-programmer" screen	\|	Press Up, A, Right, A, Down, A, Left, A, then A one more time.	\|	First, the code will show the message "HELLO!! I LOVE ??? FROM .....". Then, if A additionally is pressed before the message disappears, there will be an ASCII heart displayed.
The "character designer" screen	\|	Hold B, then press A.	\|	The message "NEVER GIVE UP" will be displayed.
The second "special thanks" screen	\|	Press A once to display the first message, then A two more times for every next message.	\|	The additional 6 "special thanks" names will be displayed: "H.HATANAKA", "H.UEDA", "T.HAGIHARA", "N.KODAMA", "M.ITO", "R.GOTOU". And the final string will be "AND YOU!!".

Blaster Master Boy (USA), Blaster Master Jr. (Europe), Bomber King: Scenario 2 (Japan)

(GEN) Stage select (added 16.07.16):
At the title screen, hold A and press Start.
Source: gamefaqs.com

Block Kuzushi GB

(UNI) Stage skip (added 17.07.16):
At the title screen, press Up, Left, Down, Right, A. A sound will confirm correct code entry. During the game hold Up/Down and press Select to skip to the next/previous stage correspondingly. Also, on pause press A to manually advance to the next frame.

Blues Brothers, The: Jukebox Adventure

(UNI) Stage select (added 17.07.16):
At the Titus logo screen, hold B, then press Right, Left, Up. Release all buttons, then press Select 7 times. Now, at the Stage number screen press Select to change the current level up to 17, after 17th pressing there will be the ending screen.

Bomb Jack

(UNI) Infinite lives (added 23.07.16):
During the game, on pause, press Up, Up, Up, Up, Up, Up, Up, Up, Right, Right, Right, Right, Up, Up, A.

Bomberman GB (USA), Bomberman GB 2 (Japan)

(FIX) Secret passwords (added 26.07.16):

2145	-	Sound test
5656	-	The Battle mode
4622	-	Start the game fully powered

Source: gamefaqs.com

Bomberman GB 3

(GEN) Secret passwords (added 26.07.16):

DEB1F7F

Boss rush mode.

Source: gamefaqs.com

Bonk's Adventure (USA), B.C. Kid (Europe), GB Genjin (Japan)

(BUR) Game genie (added 10.06.16):

009‑23E‑5D5 (for the Japanese version)	-	Re-enables the Stage select cheat. During the game, press B + Select. The same code present in the US version at 01:U24, but since there are no more proper caller for this routine, it won't work correctly all the time.
010‑03F‑E6A (for the US version) 000‑03F‑E6E (for the European version)	-	Switches the title to different region settings for corresponding versions.

Bonk's Revenge (USA), B.C. Kid 2 (Europe), GB Genjin 2 (Japan)

Japanese version:

(GEN) Stage select (added 14.06.16):
At the title screen, press Down + A + B + Start.
Source: urawaza.in

English versions:

(BUR) Game genie (added 14.06.16):

01A‑CAB‑E6A

In all English versions the Stage select mode were were disabled, but can be reenabled somehow with this code.

Booby Boys

(UNI) Ending (added 27.07.16):
Complete any of the game Worlds, after beating a boss there is a screen with some congratulation message instead of the Stage complete screen. This screen will stay untill you press Start to continue. Press Up + Right + Select to jump directly to the Ending screen. Note, in this case your progress will be lost.

Boomer's Adventure in ASMIK World (USA), Teke Teke! Asmik-kun World (Japan)

(FIX) Secret passwords (added 27.07.16):
All passwords here except the last one are not secret, but this is exactly full set of passwords and its destinations.

AXOLOTL	-	Level 8 (1st Boss)
BLUTEN	-	Level 9 (2nd World)
CHIMERA	-	Level 16 (2nd Boss)
DEWLAP	-	Level 17 (3rd World)
ELYTRON	-	Level 24 (3rd Boss)
GILA	-	Level 25 (4th World)
HYDRA	-	Level 32 (4th Boss)
IBEX	-	Level 33 (5th World)
JEDOCH	-	Top of the Tower
KURZER	-	Level 24 (Descent)
MINORCA	-	Level 23 (Descent)
PANGOLIN	-	Level 16 (Descent)
REMORA	-	Level 15 (Descent)
TROKEN	-	Level 09 (Descent)
SCARAB	-	Level 08 (Descent)
ZAHNBELA	-	Final Boss
ANCIENT	-	Stage Select

Source: gamefaqs.com

Boxxle (USA), Soukoban (Japan)

(FIX) Credits (added 28.07.16):
At the title screen, press Up + A + B + Select.
Source: urawaza.in, gamefaqs.com

(FIX) Special passwords (added 28.07.16):

Q♠MY (for the US version) さみくち (for the Japanese version)	-	Special hidden level 1.
Q♠X4 (for the US version) さみたの (for the Japanese version)	-	Special hidden level 2.

(GEN) Secret passwords (added 28.07.16):

YLM? (for the US version) かわらふ (for the Japanese version)	-	View all cutscenes in row and then the credits.
3947 (for the US version) とみさわ (for the Japanese version)	-	Music test.

Source: urawaza.in

Boxxle II (USA), Soukoban 2 (Japan)

(GEN) Secret passwords (added 28.07.16):

JYBD (for the US version) おちあい (for the Japanese version)	-	View all cutscenes in row and then the credits.
XK5R (for the US version) たかはし (for the Japanese version)	-	Music test.
?♠Q? (for the US version) とみさわ (for the Japanese version)	-	Credits.

Bram Stoker's Dracula

(UNI) Stage skip (added 30.07.16):
At the Stage number screen, before the game start, start to press B as fast as you can. If one of the pressings occurs right in time, when to Stage number screen is about to disappear, then the current level will be skipped instantly. If you skip the last level, you'll start from the beginning again. The reason why this doesn't work all the time even with autofire option in emulator is because the button pressing trigger lasts just one frame. If button is held for more than one frame, this trigger is resetting. The game checking exactly the pressings trigger, not the helds one. Probably this is just a debug leftover, but maybe just a reward cheat for fastest fingers. ;) To make this cheat reasonable, use Game genie code 9E4‑29F‑914. With this, the skip button should be held instead and will work all the time.

BreakThru!

(UNI) Stage skip (added 30.07.16):
Choose "Options" from the title menu and enter "CREDITS" there. Now press B, A, A, B, B, A. Every single press skips to the next credits screen, and at the "SPECIAL THANKS TO" (6th screen) you'll hear a sound. Now, start a new game. Any time, hold Start and press B/A to skip to the next/previous level accordingly. This also pauses the game, so you must unpause it before continue. On the emulator you can hold auto-fire B/A buttons and then shortly press Start to avoid unnecessary pausing.

Bubble Bobble

(UNI) Password generator (added 01.08.16):
There are two types of passwords can be accepted by the game. The regular passwords generated by the game itself set the maximum level number, flags for collected items and an Expert mode flag. Also, there is a secret password type, uses a different generation method and doesn't affect the level number. Instead it set the power-up flags which is used for enabling a regular in-game power-ups before starting a new level. As against the power-ups picked up during the game, the effect of these passwords is permanent even after continue. Enable "Power-up" checkbox to generate a special password. When entered, a message "POWER UP!" will be displayed with a different sound, but no return to the title screen. You need to exit the password screen first and then start a new game to enable selected power-ups. Also, with one of the special flags you can start with 9 lives instead of 3. Note, that you can't have all power-ups and 9 lives at the same time, instead if all flags are set, when exit form the password screen you'll get the Sound test mode. Also, the special pass should have at least one flag raised, if all flags are clear, the password is invalid.

Bubble Bobble Part 2 (USA), Bubble Bobble Jr. (Japan)

(BUR) Game genie (added 02.08.16):

019‑D0D‑E6A (for the US version)
019‑C6D‑E6A (for the Japanese version)

Re-enables the debug Stage select and Sound tests screens. During the game, press Select, then Start to enter this mode. A number in the middle of the screen represents the stage index as well as music index. To play music, press A, to start from the selected level press Start. Note, that so-called "Stage select" password for this game known before actually is a regular password with stage number above the valid game limits. Any valid game password threated by the game as a Stage select from 1 to level number encoded in the password itself.

Bubsy II

(GEN) Invincibility (added 02.08.16):
Pause the game, then press Up, Up, Down, Select, A, A, B, B.
Source: gamefaqs.com

Burai Fighter Deluxe

(UNI) Easter egg (added 03.08.16):
Beat the game either on Ace or Ultimate difficulty to get a graphics ending. Press A to make the character to turn face to the screen.

(FIX) Secret passwords (added 03.08.16):
All secret passwords are staring from Stage 1 on Eagle (Easy) difficulty. The Japanese version passwords are most likely the developer's names, but in the western versions due to removal of letters turns gibberish.

HGDM (for the US version) HIDE (for the Japanese version)	-	99 Lives.
KHDC (for the US version) KADO (for the Japanese version)	-	All weapons.

Source: gamefaqs.com

(BUR) Game genie (added 03.08.16):

015‑52E‑E6A (for the US version)
01D‑95F‑E6A (for the Japanese version)

Re-enables the Invincibility cheat. At the Stage number screen hold Up + Left + B before press A or Start.

Bust-A-Move 2: Arcade Edition (USA), Puzzle Bobble GB (Japan)

(GEN) Extra puzzles (added 05.08.16):
At the title screen, press A, Up, B, Down. A small character will appear at the bottom-right corner of the screen. This cheat is unlockable after completing the regular puzzle mode of the game.
Source: unlockable

(UNI) Extra continues (added 05.08.16):
Enter Options menu, put cursor to the Credits option, then press Left, Right, B, A, A, B, Right, Left. A small countdown timer will appear at the top-right corner of the screen. Now press A as fast as you can. Every 10 pressings will give you one extra continues up to 29 maximum. You have only 29 seconds.

Bust-A-Move 3 DX

(GEN) Extra puzzles (added 05.08.16):
At the title screen, press A, Up, B, Down, Up, Left, B, Right. A small character will appear at the bottom-right corner of the screen. This cheat is unlockable after completing the regular puzzle mode of the game.
Source: unlockable

(UNI) Extra continues (added 05.08.16):
Enter Options menu, put cursor to the Credits option, then press Left, Right, Left, Right, B, A, A, B, Right, Left, Right, Left. A small countdown timer will appear at the top-right corner of the screen. Now press A as fast as you can. Every 10 pressings will give you one extra continues up to 29 maximum. You have only 29 seconds.

Cadillac II

(UNI) Pre-defined card stack (added 08.08.16):
In a single-player game, at the cards shuffling screen, quickly hold Up + A + Start before the shuffling animation is started, and release all the buttons after it started. This makes the cards stack be the same for any level.

Captain Tsubasa J: Zenkoku Seiha e no Chousen

(GEN) Secret passwords (added 10.08.16):

HIDE

Hidden UFO mini-game.

Source: makainyumon.web.fc2.com

(BUR) Game genie (added 10.08.16):

622‑08F‑6EF	-	Debug mode enable. After boot up, you'll see a number representing one of the internal game handlers. Some of the game handlers are for debugging and can't be accessed during the game: 2 - Character expressions veiwer 9 - CHR data/tilemaps viewer (note, that only leftmost index used here, actual index should consist of two parts: tile data index and bg map index in one hex value, this screen however displays only decimal indexes so if idexes doesn't match, you will see rather garbage instead of an actual picture) 18 - Sound test 19 - Animations viewer Press A to enter the selected game handler or press Start to return to the normal game.
642‑0EF‑6E7	-	Prototype mode enable. In this mode after playing one round in any mode the game will show you an advertise screen, then return to the title screen.

Captain Tsubasa VS

(GEN) Secret passwords (added 16.08.16):
The only way to play VS CPU game is to write down one of two predefined passwords. The game itself doesn't have an option to show the password in this mode, so this is most likely were some kind of competition passwords available only in Japan.

もりさきもつかつてね	-	VS CPU mode regular team select.
すりいもでるのよ	-	VS CPU mode junior league team select.

Source: urawaza.in

Card Game

(FIX) Game select menu cheats (added 13.01.17):
All cheats must be entered at the game select menu in 1P mode. Hold Select, then enter Right, Down, Left, Up, Down (the common part of all cheats). Do not release Select, then complete the code with one of the sequences from the table below. Each cheat upon copleting the D-Pad buttons input will point to the corresponding game, so you automatically will start a corresponding game, which affects the code in question. Note, that cheats may be combined and will work until you reset the console.

Right, Start	-	Ending Source: urawaza.in.
Right, Up, Left, Start	-	In a Poker game, now you can do discarding of your cards up to 5 times in row per turn instead of only one discard. Hold Select before completing the discard process to skip to the next turn instantly.
Right, Up, Start	-	In a Black Jack game doubles any pay-out even if you has a draw.
Start	-	In a "U.S.A" game, when players hand has only one card, code prevents from "skip", so you will have one card always during the CPUs turns.

Castelian (USA, Europe), Kyoro-chan Land (Japan)

European version:

(UNI) Infinite timer (added 17.08.16):
Before powering the console, hold Down + B. At the title screen, release all buttons and hold Up + Right + A, then press Start. This cheat didn't present in other game versions.

Japanese version:

(GEN) Secret passwords (added 17.08.16):
At the title screen, press B to enter the password screen, now input one of these passwords to access the desired level. The passwords are given to you after completing the corresponding stage, so they aren't secret actually, but there is no password systems in any other versions of the game.

TRF	-	Stage 2
GZB	-	Stage 3
PKW	-	Stage 4
HQJ	-	Stage 5
BLV	-	Stage 6
WPT	-	Stage 7
RPR	-	Stage 8

Castle Quest

(FIX) Secret words (added 18.08.16):
Use one of these words as a player name in the Quest mode.

URAMEN	-	Secret quest mode Castle 26.
HODRACH	-	Ending.

Source: tcrf.net

Castlevania II: Belmont's Revenge (USA), Dracula Densetsu II (Japan)

(FIX) Secret passwords (added 19.08.16):
There are three secret passwords in this game: for Last Boss battle, for Sound test and for Extra lives. The rest are provided by the game when selecting the password option on the continue screen, including two parts of the Dracula's castle. When you beat game once, the hard mode flag is raised and the second quest will be started automatically. While playing the second quest, only the hard mode password will be displayed for any stage. Note, that 0 means "Empty" slot, 1 - "Orb", 2 - "Candle" and 3 - "Heart".

0,2,3,3	-	No Castles Completed
1,2,3,2	-	Plant Castle Completed
2,3,3,1	-	Crystal Castle Completed
3,3,3,0	-	Plant, Crystal Castles Completed
0,0,0,3	-	Cloud Castle Beaten
1,0,0,2	-	Plant, Cloud Castles Completed
2,1,0,1	-	Crystal, Cloud Castles Completed
3,1,0,0	-	Plant, Crystal, Cloud Castles Completed
0,2,1,3	-	Rock Castle Completed
1,2,1,2	-	Rock, Plant Castle Completed
2,3,1,1	-	Rock, Crystal Castles Completed
3,3,1,0	-	Rock, Plant, Crystal Castles Completed
0,0,2,3	-	Rock, Cloud Castles Completed
1,0,2,2	-	Rock, Cloud, Plant Castles Completed
2,1,2,1	-	Rock, Cloud, Crystal Castles Completed
3,1,2,0	-	Dracula Castle Part One (Rock, Cloud, Crystal, Plant, Castles Completed)
3,2,1,1	-	Dracula Castle Part Two
0,1,0,1	-	Hard Mode
1,3,2,1	-	Last Boss
3,3,3,3	-	Sound Test
2,2,3,3	-	Extra 10 Lives

Source: gamefaqs.com

(BUR) Game genie (added 20.08.16):

00A‑30F‑C4D	-	Re-enables the debug cheat. During the game, on pause, press Down to restore full health bar instantly.
0B6‑15A‑C42 (for the Japanese version) 0B6‑24A‑C42 (for the US version)	-	Add additional music track to the sound test, disabled in the final versions for some unknown reason.

Castlevania Legends (USA), Akumajou Dracula: Shikkoku Taru Zensoukyoku - Dark Night Prelude (Japan)

(BUR) Sound test (added 30.04.16):
An unused Sound test can be acessed by setting the RAM variables $C520 and $C521 to $0B and $00 respectively.
Source: tcrf.net

Catrap (USA), Pitman (Japan)

(GEN) Sound test (added 20.08.16):
Immediately after the console's boot up, before the title screen appears, hold Down + Left + A + B + Select. This will add an "BGM" option to the pause menu, which allows you to select the backround music.
Source: makainyumon.web.fc2.com

(FIX) Level skip (added 20.08.16):
Any time during the game, hold Start, then press Select. Release all buttons, unpause the game and just wait for a few seconds to stage being completed. If you do this cheat being in the pause mode, there is no need to unpause then.
Source: gamefaqs.com

Cave Noire

(GEN) Results tables (added 22.08.16):
At the title menu, hold Left + Start, then press B. The tables displays a maximum numbers of goals completed and enemies killed for every level in every quest.
Source: urawaza.in

Chachamaru Boukenki 3: Abyss no Tou

(GEN) Ending (added 23.08.16):
At the title screen, press B, Select, Up, Up, Select, Down, Down, A.
Source: makainyumon.web.fc2.com

(FIX) Ingame cheat sequences (added 23.08.16):
During the game, press Select to open the floor number information window, then enter one of these codes. All codes may be combined and can be used multiple times.

Up, Down, Start, Right, Start, Right, Left, A	-	Monster viewer.
Up, Start, Right, Down, Left, Start, Down, A	-	Sound test.
Up, Down, Left, Right, Start, Right, Down, A	-	Max level, 34000 exp.
Up, Right, Right, Left, Start, Start, Left, A	-	Super quipment.
Up, Left, Down, Start, Left, Start, Right, A	-	Unlimited food.

Source: makainyumon.web.fc2.com

(BUR) Game genie (added 23.08.16):

3D4‑DAE‑F73

Replaces the ingame cheat for Unlimited food with the Free walk mode toggle. Enter corresponding cheat once to enable it, then one more time to disable.

Chachamaru Panic

(FIX) Cheat sequences (added 22.08.16):
All sequences should be entered at the title screen, to activate, press Start.

Down, Up, Left, A, B, Select	-	Round select.
Select, Select, Select, Select, Select	-	Play Bonus game, then exit to the title screen.
A, A, A, A, A, B, B, B, B, B, Up, Up, Up, Up, Up	-	Extra 9 lives.
A, B, A, B, A, B, A, B, A, B	-	Speed-up at the beginning.

Source: makainyumon.web.fc2.com

Chalvo 55: Super Puzzle Action

(UNI) Sound test (added 23.08.16):
Start a new game, at the last scene of the intro with mechanic and its robot, press Up, Up, Right, Right, Down, Down, Left, Left.

(GEN) Secret passwords (added 23.08.16):

SPCLST	-	Start a Special Stage 9 with 50 lives.
JSSJSS	-	Start with 50 lives

Source: gamefaqs.com

Championship Pool

(GEN) Secret warp (added 24.08.16):
To skip the Regional Qualify and warp directly to the World Chapmionship, score 140 or lower seconds at the first round of the Speed Pool Challenge game, then start the Tournament. This cheat is unlockable and will be given to you when you complete the Regional Qualify.
Source: gamefaqs.com

(BUR) Game genie (added 24.08.16):

C81‑27C‑E68+6C1‑2CC‑5D3

Access to unused or maybe unfinished "cheat" menu. Only the resources for the display are present, there is no code to call it properly and do anything.

Chessmaster, The (USA, Japan), New Chessmaster, The (USA, Europe, Japan Rereleases)

(BUR) Hidden text (added 28.08.16):
There is an unused copyright scring at 0x008000 in all versions of the game's ROMs:

(c)1985Kittinger

Also, the US version of the New Chessmaster has an additional credits at the end of the ROM:

PROGRAMMED
BY CRAIG B.
SEASTROM
LAST MOD.
10/11/90

for Ver 1.0, and

PROGRAMMED
BY CRAIG B.
SEASTROM
LAST MOD.
07/24/91

for Ver 1.1.
Source: tcrf.net

Chibi Maruko-chan 2: Deluxe Maruko World

(UNI) Secret passwords (added 29.08.16):

らんらんらららん

Sound test.

Chibi Maruko-chan 3: Mezase! Game Taishou no Maki

(GEN) Sound test (added 30.08.16):
At the title screen, open the Mini-games selection menu (third option), then just press Start.
Source: urawaza.in

Chiki Chiki Machine Mou Race

(UNI) Stage select (added 30.08.16):
Hold Down + Right before the stage and position info screen appears either after starting a new game or selecting the continue option, a Stage select screen will appears instead.

(GEN) Easter egg (added 30.08.16):
Start a new game, at the car selection screen press Up, Up, Down, Down, Left, Right, Left, Right, B, A to make all cars spinning instead of standing still.
Source: urawaza.in

Chikyuu Kaihou Gun ZAS

(GEN) Extra 6 continues (added 31.08.16):
At the title screen, hold A + B, then press Select 60 times. A sound will confirm code triggering. From now you'll have 6 continues instead of 3.
Source: makainyumon.web.fc2.com

(UNI) Easter egg (added 31.08.16):
Press Left/Right during the staff roll sequense after beating the game to change the rotation direction of the background stars.

Choplifter III

(UNI) Secret passwords (added 01.09.16):
When one of these passwords is accepted, the game returns to the game selection menu. Now you can either start a new game or enter the password screen again and input any regular password. You can input another secret password as well, but effects aren't combined, however it's permanent.

ZZZZZZB	-	Extra 6 lives.
RTDFKLN	-	Extra 8 lives.
LTSFBMB	-	Unlimited instant Rescue rope ("R") item.

Chou Mashin Eiyuu Den Wataru: Mazekko Monster 2

(UNI) Cheat sequenses (added 23.11.16):
All these cheat sequenses should be entered right after the main game title being positioned in the middle of the screen during the starting the title screen animation, but before the "PUSH START" message appears. You'll hear a sound for every 3-button nibble. Also note, that you can enable this cheat if there is a valid save data present in the battery backed RAM, so first you should play this game and save it at least once.

A, Select, Select	-	Unlock all food and items information in your pocket library.
A, Select, Select, A, Select, Select	-	Previous effect and additional unlock all field locations.
A, Select, Select, A, Select, Select, A, Select, Select	-	Both previous effects and additionally unlock all monsters information and raise flag for both endings.

(UNI) Secret words (added 23.11.16):
Enter one of the following words as a player name.

ひろいおうじ	-	Start a new game with 8th storage bottle filled with "タマプー" creatures.
みえるんです	-	During the game in the field mode (where the creatures are living), press Select to see statistics on all creatures on current field. Also, you can reset the console and return back to the title screen, then press Select to enter the Creatures Viewer, allowing you to see all the creatures and all its animations.
Ａ・ユニット	-	Start a new game with 8th storage bottle filled with "ドラカイザー", "ドランドー", "ユノドーラ", "ドラビューン" and "パルドラピ" creatures, 2 of a kind.
みやび	-	Start with all 16 items, 10 of a kind.

(BUR) Game genie (added 22.11.16):

130‑9EB‑E62

Enter the Routine Test mode after the Banpresto Logo. Use the D-Pad buttons to select any of the game main handlers and run it with Start.

Chousoku Spinner (Yo for It)

(BUR) Hidden text (added 27.02.18):
The Cart RAM initialization routine uses two following strings as a signatures for data:

CHOUSOKUSPINNER

and

YO+FOR+ITVer0.5

Chuck Rock

(BUR) Hidden text (added 01.09.16):
There is a hidden copyright string at 0x000150 in the ROM:

COPYRIGHT SPIDERSOFT 1992

Cliffhanger

(BUR) Hidden text (added 01.09.16):
There is a hidden copyright string at 0x000150 in the ROM:

COPYRIGHT SPIDERSOFT 1993

Collection Pocket

(UNI) Shot-em-up stage skip (added 02.09.16):
Start to play any shot-em-up style game, when message "STAGE XX" is appear on the screen, hold A + Select and wait until it changes to "STAGE XX CLEAR".

(BUR) Hidden text (added 02.09.16):
The random number generator in this game initializing with an ASCII string: "STAR".

College Slam

(UNI) Secret teams (added 03.09.16):
Both cheats should be entered at the title screen. A sound will confirm correct code entry. Each cheat will disable another one when triggered, so you can have only one enabled at once.

Hold B, wait for 5 seconds, then press A	-	Two extra teams: Acclaim (White Team) and Torus (Cavemen).
Hold A, wait for 5 seconds, then press B	-	Seven extra Fraternity teams.

(UNI) Max team points (added 03.09.16):
At the main menu, enter "GAME OPTIONS", then "EDIT TEAM". Select any team, then at the "EDIT STATS" screen put cursor to the "Exit" option and press B, A, Down, Right, A, Down, Up, A, Down. This will temporarily set MAX points for all members of currently selected team to 60. When you re-enter this screen once again all MAX values will be restored, but all points assigned to any team member previously will be saved.

(UNI) Tonight's match-up screen cheats (added 03.09.16):
All these cheats can be entered at the Tonight's Match-up screen in any regular game mode except "PRACTICE" (which is haven't it). All of them affects only the current match and used for adjusting game-play mechanics (similar to all other ports of this game to many platforms). You can input only one cheat at once and have no retries, so if you make a mistake, you can try again only the next round. Upon entering the sequence, press Start to accept it and begin a game. A sound will confirm correct code entry. Additionally, at the beginning of the round a small message will appear at the bottom of the screen with a short name of used cheat (except two, see below).

Down, B, Up, Up, Down	-	Shot percentage display at the bottom of the screen. The only correct cheat for this game from the gamefaqs.com. The rest are just trash.
A, Right, Left, Left, Left, Left	-	Quick hand
B, Right, Right, Right, Left, Right, B	-	Max power
Down, Up, Right, Up, Down, Right	-	Goaltend
A, Left, Down, Right, Right, B	-	Always on Fire
Up, Left, B, B, B, A, Down, Down	-	Turbo
Up, Down, A, B, Up, A, B	-	Offence
Down, Up, Up, Down, Left, Right, Left	-	Always do 3-pts shots
B, A, Left, Right, A, B	-	Ultra jam
Right, Down, Down, Right, A, B, A	-	Unknown (displays only "Push")
A, A, Up, Up, Up, Up, Left, Left, Left, Left	-	Unknown (displays only "Push")
A, B, Up, Up, Up, Up, Left, Left, Left, Left	-	Unknown (displays only "Push")
Right, Right, A, A, A, A, A, Right, Right, Right	-	Unknown (displays nothing)
A, Down, Up, Down, Up, Down, Right, Up, A, A, A	-	Unknown (displays nothing)
Right, A, Down, B, A, Left, Left	-	Show time

Contra (Japan Single game card, Konami GB Collection Vol.1), Operation C (USA), Probotector (Europe)

(FIX) Cheat sequenses (added 24.11.16):
All cheat sequenses should be entered at the title screen, when title animation is over.

Up, Down, Left, Right, Start	-	Sound test (all versions)
Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A, Start	-	Stage select (the US and the European versions), Extra 9 lives (the Japanese version, the Stage select is enabled here by default)
Up, Up, Up, Up, Down, Down, Down, Down, Left, Left, Left, Left, Start	-	Extra 9 lives (the US and the European versions only)

Source: gamefaqs.com

(BUR) Game genie (added 24.11.16):

00A‑EBF‑C4D

Re-enables the simple sprite viewer. Just press Start during the game and press A/B to cycle through all possible ingame sprites at the player's position.

Contra: The Alien Wars (USA), Contra Spirits (Japan), Probotector 2 (Europe)

(FIX) Secret passwords (added 24.11.16):
When enter one of the secret password you'll hear a special sound and return back to the Konami logo automatically. The effects can be combined, just enther the "PASSWORD" option again and input another password.

B32R	-	Infinite lives. Source: gamefaqs.com
P3LS	-	At the title screen, start a new game to see an Ending.
H2F2	-	Press Start during the game to complete current level instantly. Source: gamefaqs.com
M1LZ	-	Allows you to play past Level 3 on Easy mode.
K4RN	-	Reverse the D-Pad buttons during the game.

(BUR) Invincibility (added 25.11.16):
The secret passwords in this game uses RAM variable $C1E4 to store its flags. Bits 0-4 of this variable corresponds to the secret passwords in the same order as in the table above. But the game uses additional bit 5 as invincibility flag, which is can't be set during the game and seems just a leftover from the developement stage or were planned to be enabled with additional sixth secret password as well. You can set it manually using the cheat codes, just write L to $C1E4. Note, the only enemy able to damage you is the flying enemies in Level 3 which grabs you and fly out of the screen.

Cool Spot

(GEN) Stage select (added 28.11.16):
At the title screen, press Right, Right, Right, Left, Left, Left, Right, Left. During the game, press Start then hold Select and press Start again.
Source: gamefaqs.com

Cool World

(UNI) Cheat mode (added 28.11.16):
At the title screen, hold Up, then press A + B 8 times. A sound will confirm cheat triggering. Input this code one more time to switch this cheat off. When enabled, at the title screen, hold Down + A and press B to select the starting level. Also this code grants you the infinite lives during the game.

Cosmo Tank

(FIX) Sound test (added 11.11.16):
During the quest mode game, press Start to pause it, then hold Down + A + B and press Start again.
Source: urawaza.in

Crayon Shin-chan: Ora to Shiro wa Otomodachi Da yo

(BUR) Game genie (added 28.11.16):

6C1‑54E‑A2B+111‑55E‑E6E

Any time during the game, use the regular soft-reset code (A + B + Select + Start) to enter the debug menu. You can select the starting level, enabe the invincibility, increase the lives counter up to 63, as well as listen to the game music and the sounds. The "てき" flag never used in game, so does nothing. Exit this menu to the title screen and begin a new game to apply changes.

Crayon Shin-chan 2: Ora to Wanpaku Gokko Dazo

(BUR) Game genie (added 30.11.16):

A8E‑90F‑A2B+0EE‑90F‑E6E

Any time during the game, use the regular soft-reset code (A + B + Select + Start) to enter the debug menu mostly exactly the same as in Part 1. You can select the starting level, enabe the invincibility, increase the lives counter up to 63, as well as listen to the game music and the sounds. Instead of unused "てき" flag, here is "サブ" can be enabled and havily used during the game (investigate).

Crayon Shin-chan 3: Ora no Gokigen Athletic

(GEN) Extra mini-game (added 03.11.16):
At the title screen, press Up, B, Right, B, Down, B, Left, B. A sound confirm correct code input. This will add an extra 10th mini-game "ACTIONMASK VS SHINCHAN" to the mini-games menu. Normally this mini-game can be unlocked after the final credits if all 9 mini-games are beaten.
Source: urawaza.in

Crayon Shin-chan 4: Ora no Itazura Daihenshin, Super Mario Land 4 (Pirate)

(UNI) Secret passwords (added 14.12.16):

かみしばい

Test mode screen. Allows you to see all conversations, level intros, both endings and play minigames between stages.

(BUR) Game genie (added 14.12.16):

003‑57B‑F7A

At the title screen, start a new game to enter the Debug menu instead. Allows you to play any level from the beginning or from the midpoint, select amount of lives, items to carry, as well as to enable invincibility. Also you can listen to all music and game sounds. Note, there are no numbers displayed because of lack of the proper font in the title screen CHR data, however they are selectable by pressing Left/Right anyway.

Crazy Burger (Unlicensed, Sachen 4-in-1 Vol.9)

(GEN) Ending (added 17.05.16):
At the title screen, press B, A, B, B, A, A, B, B, Select, then start a new game.
Source: gamefaqs.com

Crystal Quest

(UNI) Secret options (added 21.12.16):
There a few secret options that can be accessed via the secret button codes listed in the table below. All must be entered at the title screen. You could have only one option at a time before the game. But enabled options are kept permanently even after the game over.

Up, Up, Up, Down, Down, Down, Left, Right	-	Starting Wave select (up to 40).
Left, Right, Left, Right, Up, Down	-	Shot mode select.
Down, Down, Down, Up, Up, Up, Left, Right	-	Ship speed select.

(UNI) Continue (added 21.12.16):
When the game over message is displayed, press Down + Select + Start.

Cutthroat Island

(BUR) Game genie (added 12.01.17):

511‑9BF‑196

Replaces the title screen with the Demo Mode screen, where you can select any level to play and enable some debugging display during the game.

Source: tcrf.net

Cyraid (USA), Bakuretsu Senshi Warrior (Japan)

(GEN) Suicide:
Any time during the game, except the bonus stages, hold B, then press Select.

(GEN) Secret passwords:
Enter one of the following words as a password.

THEEND	-	Harder mode (unlockable after beating the game once).
MUTEKI	-	Invincibility.
EPOSAS	-	Level skip. Hold A and press Select during the game.

Source: gamefaqs.com

Daedalian Opus (USA), Bouken! Puzzle Road (Japan)

All versions:

(GEN) Secret passwords (added 17.01.17):

ZEAL

Stage select

Source: gamefaqs.com

US version:

(BUR) Game genie (added 17.01.17):

621‑5FF‑3B3+081‑60F‑2A2

With this code, at the title screen, enter the PASSWORD option to run some kind of very simple drawing program instead. The background is filled with a brick wall tiles by default. Hold A, then use the D-Pad buttons to draw with black tile, hold B and also use the D-Pad buttons to erase black tiles. There is no such code in the Japanese version at all.

Daffy Duck: The Marvin Missions

(GEN) Super stage (added 17.01.17):
Step on the cart right at the beginning of the first level. This makes Daffy acquire a lot of speed as long as he doesn't touch the ground. If you manage to reach the end of the room at high speed, instead of loading the next room, the game will show a black screen with the text "Super stage" and you can play through a new set of levels.
Source: gamefaqs.com

(FIX) Pause cheats (added 17.01.17):
Pause the game, then enter one of the following button sequences to get the corresponding effect. Note, every cheat costs you 10 points, which is given during the game for defeating enemies. However, the jetpack refill cheat will only work if you have at least 20 points. To restore to the default weapon and reset all cheat counters, also on pause, press Select.

Code	\|	Effect	\|	At bosses?	\|	Mode
Up, Up	\|	Laser weapon	\|	No	\|	Any
Left, Left	\|	Bounce weapon	\|	No	\|	Any
Right, Right	\|	Autofire weapon.	\|	No	\|	Any
Down, Down	\|	Wall break weapon.	\|	No	\|	Any
B, B	\|	Refill health bar.	\|	Yes	\|	Any
A, A	\|	Refill jetpack.	\|	Yes	\|	Super stage only

Source: gamefaqs.com

(FIX) Secret passwords (added 17.01.17):
This is not quite a secret passwords list. The passwords system in this game is very lame. Although the game gives always the same passwords, you can use any other numbers with just one condition: the sum of the numbers in password should match the particular stage requirement. The complete list of sums you can see in the table below. For example, the stage 3 sum is 11, the default password is 04070 (4+7=11), but you can use any of these: 13070, 12161, 90002, etc...

Sum = 20	-	Stage 1
Sum = 17	-	Stage 2
Sum = 11	-	Stage 3
Sum = 22	-	Stage 4

Source: gamefaqs.com

Daiku no Gen-san: Robot Teikoku no Yabou

(UNI) Cheat mode (added 22.04.17):
To enable the cheat mode, at the title screen, press Up, A, Down, B, Left, Right, Left, Right, B, A. A sound will confirm correct code entry. There are several options available now.
At the title screen, press and hold Start. While holding it, wait for the "PUSH START" message stops to fade in and out, then press B button a number of times corresponding to the Stage or substage number including bosses, up to 13. Every time you press the B you'll hear a sound. Release, Start to begin the game from the selected Stage.
During the game, press and hold Start. While holding it, wait for the pause jingle is over, then enter one of the sequences from the table below to get the corresponding effect. Every time you press the correct button, you'll hear the same sound effect as on the title screen when cheat is activated.
Also, you can use now Select to freeze the game as an alternative to the pause mode.

Right, Left, Right, Left, Down, Down, Up, Up, A, B	-	Refill lives.
Up, Down, Up, Down	-	Instant Game over.

(BUR) Hidden text (added 22.04.17):
There is a version string at the beginning of the sound engine in the very first bank of the ROM:

** Ver 6.04 **

Dan Laser (Unlicensed, Sachen 4-in-1 Vol.7)

(GEN) Stage select (added 16.05.16):
At the title screen, press A + B + Select + Start. Numbers from 1 to 7 is a regular levels, number 8 is an ending, number 9 is a special credits screen, never seen an any other way in this game. Cheat itself is unlockable and is given to you by the game if you finish it once.

(UNI) Maximum powerups and restore lives (added 16.05.16):
During the game, press Start to pause it then hold A, press and release B twice, release A, hold B, press and release A twice, release B. Press Start to unpause the game, and you'll obtain full weapons, powerups and restore lives to 9.

(BUR) Hidden text (added 16.05.16):
There is a hidden build date string at the beginning of the ROM:

SHOOT ! 93/07/19

Source: tcrf.net

Darkwing Duck

(BUR) Game genie (added 19.01.17):

C88‑B68‑F79

Re-enables the Stage select screen. To access it, just press Start at the title screen. The Stage select screen meant to be accessed via button sequence code Up, Down, Right, Left, A, B, Select at the title screen. The sequence check routine still present in the ROM at 07:78D1, but there are no script commands to call it, as well as there are no references to the unused portion of the title screen script, which selects the Stage select mode.

Days of Thunder

(BUR) Game genie (added 20.01.17):

00A‑04F‑E6E

Start a new game and select any game mode to get to players number selection screen, which is presumable should be started before the main menu selection. The code doesn't allow you to play the 1-player mode from there, but you still can run rather unfinished 2-player mode if use the link cable with two Game Boys. There are a lot of issues with this mode, some wrong positioned texts on the screen, you can't change the car color or player name. You able to select the course and play it somehow, but it mostly playable. The 4-player mode need some device, but even if you have it, you can't play this mode. It's quite in a basic state and working only as the 4-player hardware checking and players ready status display. The rest of the code doesn't connected even to this code at all, and has no any texts or screen layouts.

Dead Heat Scramble

(GEN) Stage select (added 21.01.17):
At the title screen, put cursor to the "1 PLAYER" option, press B 8 times, then A 8 times. Now, press B to cycle between levels 1 to 10. Press Start to begin a new game from the selected level.
Source: gamefaqs.com

Deep: Final Mission (Unlicensed, Sachen 4-in-1 Vol.9)

(BUR) Game genie (added 17.05.16):

4B2‑13F‑A2B+052‑14F‑C4E

Re-enable an unused Mega Duck logo at game boot. Unfortunately, this code does not allow you play the game.

Defender (Arcade Classic No. 4)

(UNI) Skip to hi-score (added 29.06.16):
At the title screen, hold Left, then press Select to skip to the hi-score display immediately without need to wait.

(UNI) Continue (added 29.06.16):
Enter the Options menu, put cursor to the "EXIT" option and press Left 40 times until you hear a sound. Now, instead of game over during the game you'll get to the Continue menu. Continues are unlimited.

Dennis the Menace (USA), Dennis (Europe)

(BUR) Hidden text (added 23.01.17):
There is a hidden version string in the ROMs of both regional versions at $0063 offset:

Version 1.0
Time 12:46:27
Date 09.20.93

for the US version, and

Version 1.0
Time 12:47:19
Date 09.20.93

for the European version.
Source: tcrf.net

(BUR) Game genie (added 23.01.17):

011‑58F‑E6A

Re-enables the Stage select screen right before the game starts.

Source: tcrf.net

Desert Strike: Return to the Gulf

(GEN) Secret passwords (added 23.01.17):

BQQBZH

A message "HELLO, LITTLE OLD LADY" will appear. This will give an extra 10 lives instead of 3 at the game start.

Source: tcrf.net

(BUR) Hidden text (added 23.01.17):
There is an unused string at $45A5 in ROM:

GO FOR SOUND

which is most probably the only leftover from planned or removed Sound test mode.

Dexterity (USA), Funny Field (Japan)

(UNI) Stage select (added 24.01.17):
Start a new game, select the game type and BGM music, before pressing Start, hold one of the following combinations to start from the corresponding stage.

Up + Left + B	-	Round 11 (Single mode), Round 1 (Multi mode)
Up + Right + B	-	Round 21 (Single mode), Round 2 (Multi mode)
Down + Right + B	-	Round 29 (Single mode), Round 3 (Multi mode)

Dick Tracy

(GEN) Secret passwords (added 24.01.17):

47214

Enables the Debug mode. There is no any indication when you enter this pass correctly. But now, during the game:
Press Up + Select + Start to toggle invincibility.
Press A + Select + Start to skip to the next stage.
Press B + Select + Start to deduce one continue without any indication as well.
Also you can see the player's coordinates at the bottom-left corner of the pause screen.

Source: tcrf.net

Dino Breeder, Jurassic Park 3 (Pirate)

(GEN) Easter egg (added 11.05.18):
At the save file selection menu before the game, enter the "てきキャラずかん" ("Enemy picture book") option. Scroll pages while holding Select to change all enemy regular pictures to those as if they get hit.
Source: urawaza.in

Dino Breeder 2

(BUR) Game genie (added 26.01.17):

FA2‑AAF‑E65	-	Re-enables the Stage select at the beginning of the game. Hold Select before the main game field appears either after the creating the new game or continuing the saved one. The screen will stay white and will wait for some input. Press B to cycle between 20 available starting stages, press Left + B to set the maximum stage number. Press Start to begin the game. Any time you press a buttou you'll hear a corresponding sound.
FA3‑BCE‑E65	-	During the game, press Up + Left + Select to grow the Dino up to the next level.
FA1‑ABD‑E65	-	Pause the game with Start, then press Select. The effect is exactly the same as for the previous code.
FA2‑DFB‑E65	-	At the save game selection screen, hold B + Select and enter the Enemies library to open all records.
FA6‑349‑E65	-	The same as previous with the same button code, but for the New creatures library.
FA6‑F09‑E65	-	Additionally for the New creatures library select any entry, press Up + Select or Down + Select to fill or erase corresponding creature record.

Disney's Mulan

(BUR) Game genie (added 27.01.17):

041‑F2B‑E66+042‑00B‑E66

Allows to select an extra 4th option in the Options menu, which happens to be glitched and seems unfinished Sound test mode.Press Left/Right to select the sound effects, there is no music selection in this code.
Press B to play it.
Effects can't be stopped, which may cause the problems and more glitches. There is no text for menu option, but the ROM contains a table with set of text resources for displaying numbers from 0 to 39, which is a number of possible selectable sound effects in working code.

Dodge Boy

(UNI) Secret passwords (added 28.01.17):

NIKNO	-	Ending.
MAKYU	-	A special match. Your team is Australia and you already beat the China, now is the match against USA. This cheat uses the regular pass "ET9RG" for setup the game, but raises the special flag, which meaning isn't checked carefully, but seems it enables all power throws during the match.

Donkey Kong

(GEN) Data all clear (added 01.02.17):
At the Select File screen, press B + Select + Start + Left to enable the "DATA ALL CLEAR" menu which allows you to erase all saved files at once.

Donkey Kong Land (USA), Super Donkey Kong GB (Japan)

(BUR) Hidden text (added 01.02.17):
There are a lot of unused hidden copyright sctings spreaded through the ROM:

* By Paul Machacek / RARE LTD *

and

*By  Paul Machacek*

in both regional versions, and

PAULMACHACEK

only in the US version.
Source: tcrf.net

Donkey Kong Land 2 (USA), Donkey Kong Land (Japan)

All versions:

(FIX) Stage quit (added 02.02.17):
To exit from already completed stages any time, pause the game then press Select.
Source: gamefaqs.com

US version:

(GEN) Save screen cheats (added 02.02.17):
At the Save game selection screen, hold Left or Right, then enter one of the following button sequences. The codes may be combined. A sound will confirm correct code entry. Although the Japanese version has this cheat disabled, the code and flags are still working there. While at the Save game selection screen, set the lower three bits of RAM variable $FFF9 to raise corresponding flags, then start a game.

A, A, B, B	-	Extra 50 lives
B, B, A, A	-	Extra 40 Banana Coins
A, B, A, B	-	Extra 47 Kremkoins

Source: gamefaqs.com

Donkey Kong Land III

(GEN) Title screen cheats (added 03.02.17):
All cheats are for the title screen. Enter one of the sequences from the table below, then press Right to finish the code input, a sound will confirm correct code entry. Codes can be combined.

Up, Up, Down, Left	-	Matching Card Game
Down, Down, Up, Left	-	Extra 50 Lives
Up, Down, Left, Left, Down, Up	-	Unlock all levels

Source: gamefaqs.com

Doraemon: Taiketsu Himitsu Dougu!!

(FIX) Secret passwords (added 03.02.17):

むてき	-	Invincibility. However, you still can die at some obstacles, like pits. Source: imasaragame.com
へいき	-	Weapon select. Press Select any time during the game. Note, in the overworld mode the same button shows the map as well, so you need to press Select twice in row.
さかた	-	Weapon select and Stage skip. To skip the stage, pause the game then press Select for the overworld stages or A for other game events.
ももこ	-	Invincibility, Weapon select and Stage select. Additionally all cutscene messages are skipped automatically. You only be able to press A to exit from the cutscene mode. Source: imasaragame.com

Doraemon 2: Animal Planet Densetsu

(GEN) Sound test (added 04.02.17):
One of the items that hidden in the River stage of the game called "MINI KARAOKE SET" and when used start a Sound test mode.
Thanks Yamada+Arthur for info.
Source: imasaragame.com

(GEN) Secret passwords (added 04.02.17):

むてきになります

Invincibility. Note, the game need 10 letters in password, so you must fill last two positions with any letters. A sound will confirm correct code entry.

Source: makainyumon.web.fc2.com

Doraemon Kart

(GEN) Cart RAM clear (added 06.02.17):
Hold A + B + Down, then power on the console. A sound will confirm correct code entry. Your current saved game will be earased.

(FIX) unlockables (added 06.02.17):

Complete the Story mode once with any character	-	Unlock Extra sixth character Dorami-chan as well as Extra three Momoko's courses.
Complete the Story mode twice with any character	-	Unlock a Free course mode. Now all character's courses of all levels are available to play at once and you may select any character before playing any course. This also unlocks an Extra Doraemon-shaped course.

Source: gamefaqs.com

(GEN) Ending cheats (added 06.02.17):
Unlock Free course mode as described above. Now, complete all the courses including the Momoko's courses and the Doraemon-shaped course (19 in total). If done right, there are two cheats will be enabled at the title screen. Hold one of the following combinations to get the corresponding effect.

Down + Left + B	-	See Ending 1
Up + Left + B	-	See Ending 2

Source: urawaza.in

Doraemon no Study Boy 5: Shou 2 Sansuu Keisan

(UNI) Debug leftovers (added 07.02.17):
There is a debugging feature left in the release version of this education program. To enable it, hold A or B or both, then power the console on. This feature should work mostly as auto solver for exercises upon pressing A. However, it seems they just forgot to remove it at some point of developement, then made some changes incompatible with the old debugging code. As a result, when used in the release version, it causes a lot of problems like garbled graphics and even hanging the console.

Double Dragon

(BUR) Game genie (added 08.02.17):

043‑76F‑E6A

Re-enables simple Stage skip feature. During the game press Select to instantly complete current stage.

Double Dragon II (USA), Nekketsu Kouha Kunio-kun: Bangai Rantou Hen (Japan)

(BUR) Game genie (added 08.02.17):

00A‑92F‑E66 (for the US version only)	-	The US version of this game has two intro cutscene frames with blood and killing, obviously removed due to censorship. Both still sitting in ROM and can be accessed with this code. Source: tcrf.net
30B‑769‑E6A (for the US version) 30A‑509‑E6A (for the Japanese version)	-	Re-enables additional finishing move after foot-kick from the close range (the B button). In the release version there is no difference whether you hold Left or Right during the kick or not. This code adding the difference to kicks with Left/Right held. It will do grip and throwing move instead of high jump with kick.

Double Yakuman

(GEN) Credits (added 10.02.17):
At the title screen, hold either Left or Right, then press B.
Source: urawaza.in

(UNI) Tile fetch editor (added 11.02.17):
At the title screen, enter the Credits screen as described in section above exactly 3 times, then start a "1-PLAYER" game. During the game, before the tile is fetched, press Start to enter the Tile fetch editor. There are 16 numbers will be displayed on the screen. Use D-Pad button to select any of them, and A/B button to increase/decrease them. The numbers represents the custom tiles queue, which will be used first to select the next tile. Note, you can't see the other player's hand, so you may choose tiles already fetched, they won't be tossed to you obviously, the regular tile fetching procedure will be used instead. To be able to use the same cheat in "SIMPLE MODE", you must enter the Credits screen 254 times instead.

(UNI) Tile fetch cheat for 2-players mode (added 11.02.17):
At the title screen, enter the Credits screen as described in section above exactly 255 times, then start a "2-PLAYERS" game. It somehow will adjust the tile fetching as well, but need to investigate what exactly it does.

(UNI) Secret pictures (added 10.02.17):
Play the "MAHJONG HOUSE" mode of the "1-PLAYER" game. Select either Maririn or Inajima Oryuu as opponent. Finish match with positive points. At the match results screen enter Up, Down, Left, Right, B. The default message of the opponent will change and the face animation of the character will stop. Now, press any button to advance to the secret pictures of particular girl.

(BUR) Special secret picture (added 10.02.17):
There is one more much complicated cheat sequence exists in this game (Up, Down, Left, Right, Up, Up + A, Down, Down + A, Left, Left + A, Right, Right + A, B, A + B, Right, Right + A, Right + A + Select, Left, Left + A, Left + A + Select, Down, Down + A, Down + A + Select, Up, Up + A, Up + A + Select, B, A + B, A + B + Select). It should be entered at the Inajima Oryuu's secret picture. If done right, the breasts area of the girl will be replaced with some patch, but the patch data exactly the same as used in the original picture, so nothing is changes. Most probably, they planned to add some nudity or the original pictire were different, but currently there is no point to use this code at all. The only indication that this sequence is working, that the face animation of the girl will stop as well.

(BUR) Game genie (added 10.02.17):

FEF‑FFC‑E6A	-	Re-enables the Debug features. Most noticeable ones are: The opponents tiles are now can be seen during the game. The Tile fetch editor overwriting with more powerful memory viewer/editor. The corersponding cheat at the title screen also disabled, memory view now availableany time by pressing Start. The tile fetching procedure becomes trivial. The game will just select the tiles in its order in a stack. Adds a new shortcut for "2-PLAYERS" cheat, described above. Instead of entering the Credits screen 255 times, you just need to enter it 4 times at the title screen, then start the "2-PLAYERS" mode.
000‑00B‑C4D	-	Additionally to the code above, this one adds some debugging display during the game match at the top-right corned of the screen, under the opponent's tiles. There is not clear what it means, but holding Up, then pressing Left or Right during the game sometimes will reveal some changing values there.

Double Yakuman II

(GEN) Credits (added 10.02.17):
At the title screen, hold either Left or Right, then press B.
Source: urawaza.in

(GEN) Alt game field type (added 10.02.17):
At the title screen, hold either Left or Right, then press A or Start to begin the game. This will start the game with a different field type. Also, you can switch between two different field types during the game if hold Up, then press Start.

(UNI) Tile fetch editor (added 11.02.17):
At the title screen, enter the Credits screen as described in section above exactly 11 times, then choose the "OPTION START" mode. During the game, before the tile is fetched, hold Down, then press Start to enter the Tile fetch editor, exactly the same as in the first part of this game (see above). To be able to use the same cheat in "QUICK START" mode, you must enter the Credits screen 254 times instead.

(UNI) Tile fetch cheat for 2-players mode (added 11.02.17):
At the title screen, enter the Credits screen as described in section above exactly 255 times, then start a "2-PLAYERS" game. It somehow will adjust the tile fetching as well, but need to investigate what exactly it does.

(BUR) Game genie (added 10.02.17):

FEF‑FFC‑E6A

Re-enables the Debug features. Most noticeable ones are:
The opponents tiles are now can be seen during the game if the side-by-side field type is selected.
The Tile fetch editor overwriting with more powerful memory viewer/editor. The corersponding cheat at the title screen also disabled, memory view now available any time if you hold Down, then press Start.
The tile fetching procedure becomes trivial. The game will just select the tiles in its order in a stack.
Adds a new shortcut for "2-PLAYERS" cheat, described above. Instead of entering the Credits screen 255 times, you just need to enter it 4 times at the title screen, then start the "2-PLAYERS" mode.

Double Yakuman Jr.

(BUR) Game genie (added 10.02.17):

FEF‑FFC‑E6A	-	Re-enables the Debug features, exactly the same as in the non-junior version, but with the exception that the Tile fetch editor disabled here at all, although the code for enabling it still there.
041‑A0D‑E62	-	Also, the Junior version has the cheats for secret girl picture displaying removed. However, the picture and displaying code is still there exactly the same. Use this GG code, then play any match with Maririn to see its picture instead of the match results screen, or play any other opponent to see the Inajima Oryuu's picture as well.

Downtown Special: Kunio-kun no Jidaigeki dayo Zenin Shuugou!

(GEN) Secret words (added 11.09.17):
Start a new game, press Start, Start to enter the in-game menu. Open rightmost option at the bottom ("なまえ", "Name"), then enter following word as a first character's name ("くにまさ"). Note, the nigori symbol at the end must be entered separately after "し".

いいかんじ

Extra 999999 money and unlock all special moves for both players.

Source: urawaza.in

Dracula's Castle (2019, Habit Soft)

(UNI) Sound test (added 03.12.19):
At the "Habit Soft" logo screen, press Up + A.

(UNI) Language change (added 03.12.19):
At the title screen, hold Up and press Select to toggle between Japanese and English languages. All Japanese text fully translated in English mode.

(UNI) Extra 10 continues (added 03.12.19):
At the title screen, hold Up and press A, A, A, A, release Up. Hold Down, press B, B, B, B. A sound confirm correct code entry. Then start a new game.

(UNI) Stage select (added 03.12.19):
At the title screen, hold Up and press A, A, A, A, release Up. Hold Down, press B, B, B, release Down. Hold Left, press A, A, release Left. And finally, hold Right, press B, Start.

(BUR) Hidden text (added 25.12.19):
There is a hidden version and copyright message inside the ROM at 0x18002:

VER.1.0.4 DATE:2019/03/13 PROGRAMMED BY NICK.D.G

Dragon Ball Z: Gokuu Gekitouden

(FIX) Mini-games (added 16.02.17):
Right before the title screen, while the opening text is scrolling up, enter Up, Down, Left, Right, Down, Up, Right, Left, then press any button to advance to the title screen, then one more button to skip to the title menu. An additional item "MINIGAME" will appear. There are 4 mini-games available, as well as "learning" room.
Source: urawaza.in, gamefaqs.com

(FIX) Secret passwords (added 16.02.17):
The password system here is available only for the "2P BATTLE" game in the SGB mode. It is used for some character parameters generation: AP/DP/SP/CP/BE and EE. There are two types of passwords, generated ones (you can obtain one after completing the game after the staff roll, which saves your current character's parameters), and a secret ones. Here is the list of the secret passwords.

FEDCBA9876543210	-	AP 99/DP 99/SP 99/CP 63/BE 42/EE 15 Source: urawaza.in, gamefaqs.com
1111111111111111	-	AP 00/DP 00/SP 00/CP 00/BE 00/EE 00
0123456789ABCDEF	-	AP 30/DP 30/SP 30/CP168/BE 97/EE 00

(UNI) Extra characters in tournament (added 17.02.17):
Select either the "1P TOURNAMENT" or "2P BATTLE" game mode, chose "NEW GAME" option, setup the game, then finally press A to begin the actual game. While the screen is white, quickly hold Up + A + Start and wait for the introduction. If done right, you can choose any character from the list, not only three main characters of the game.

(UNI) Exhibition menu (added 17.02.17):
During the game, on the way to Guru's, if you take a detour and head to the Namekian Village that's in ruins, you can play a Pushing Rock minigame there. It's not really important for the completing of the game itself, but serves another purpose. Beat all 8 stages of this minigame ("ド", "ラ", "ゴ", "ン", "バ", "ー", "ル" and "Ｚ"), return back to the game, then hold Up + A and press Start to access the ingame menu. If done right, the menu will have one extra item ("てんらんかい" or "Exhibition") giving you the access to menu where you can view all battle and conversation pictures for all characters and listen to the music and sounds.

Dragon Slayer I

(GEN) Phase 2 warp (added 18.02.17):
At the title screen, press Up, Down, Left, Right, A. This code is unlockable and given to you after you clear PHASE 1.
Source: gamefaqs.com

Dragon Slayer: Nemuri no Oukan

(FIX) Secret names (added 20.02.17):

ほろぼろ	-	Change the main character appearance to Chicken-like bird "Horoboro". Source: urawaza.in
あんデド	-	Extra 65535 of money at the beginning of the game.

(BUR) Hidden text (added 20.02.17):
The game uses string

ARGENT91

as SRAM initi signature.

Dropzone

(FIX) Cheat sequences (added 21.02.17):
All cheats should be entered at the title screen, after "DROPZONE ADVERSARIES" has been displayed. If entered correctly, the game will start immediately, so you couldn't use more than one cheat at once.

Up, Down, Right, Right, Left, Left, Up, Down	-	The Cloak timer 4 times slower.
Right, Left, Left, Right, Down, Left, Up, Right	-	Extra 25 lives and bombs.
Down, Left, Up, Down, Up, Down, Up, Left	-	Start on Wave 5. Source: gamefaqs.com
Left, Left, Right, Down, Up, Left, Right, Down	-	Start on Wave 10.

Duck Tales 2

(BUR) Game genie (added 27.02.17):

0F7‑6FB‑C46

Re-enables the Stage select, exactly the same as in Darkwing Duck game. Both games shares the same scripting engine as well as the same unused disabled Stage select cheat routine and scripts.

Dungeon Land

(BUR) Hidden text (added 01.03.17):
There is a hidden copyright scring inside the ROM:

(C) 1991 RANDOMHOUSE

Also, the SRAM init routine in this game uses following string as a signature:

RH-EX008

DX Bakenou Z

(UNI) Secret message (added 01.03.17):
Any time during the game, press and hold A + B + Select + Start (the Soft Reset code), while holding these buttons, press and hold Left for about a half of the second then release all buttons at once. Now, after the game boot up, in the main menu, enter 5th option ("SYSTEM"), then 4th ("SOUND TEST"). The developers logo will appear at the top-left corner of the screen.

(UNI) Credits (added 01.03.17):
Any time during the game, press and hold A + B + Select + Start as described above, but press and hold Right for a half of second. Release all the buttons and at exactly the same moment press Select. This may be tricky, keep trying. If done right, the credits scroll will follow immediately.

(BUR) Hidden text (added 01.03.17):
The SRAM initialization routine in this game uses as a signature string:

lovelymilk

Escape 2042 (Orion Soft)

(GEN) Ending (added 03.01.20):
At the title screen, press Select + B, then press Start. This is unlockable cheat displayed after you beating this game once.
Source: Unlockable

Explosive Brick (Unlicensed, Sachen 4-in-1 Vol.8)

(GEN) Extra stage 33 (added 17.05.16):
At the title screen, press Left, Left, A, Right, Right, B.
Source: gamefaqs.com

(GEN) Extra stage 34 (added 17.05.16):
At the title screen, press Right, Right, A, Left, Left, B.
Source: gamefaqs.com

(GEN) Credits (added 17.05.16):
At the title screen, press Left, Right, A, Right, Left, B.
Source: gamefaqs.com

F-1 Race

(GEN) Demo speed control (added 29.03.17):
During the demo sequence, press either A or B to increase or decrease the car speed correspondingly. Note: there is no proper indication of changed speed in this case on the game's HUD.
Source: urawaza.in, gamefaqs.com

Faceball 2000

(FIX) Secret names (added 30.03.17):
Go to options, then change the player's name to one of the following to get a corresponding effect.

SOUNDTEST	-	Sound test.
PHOTOPAUSE	-	Disable the splash message on pause.
CONFIG+SYS	-	Level select and additional parameters of the player setup. Source: tcrf.net, gamefaqs.com
SHOWENDING	-	Show the ending.
EXTRALIVES	-	Extra 5 lives at the game start.

Family Jockey 2: Meiba no Kettou

(UNI) Extra money (added 31.03.17):
At the title screen, press Left, B, Right, Left, Left, Right, Right, B, then choose a new game to start with 100000 money.

(BUR) Debug flags (added 31.03.17):
The Extra money cheat uses variable at address $A8C1 in Cart RAM area to store its flag. But the same variable contains two more debug flags, never raised by the game, but tested at some points.
Set bit 0 of this variable to enable the debug race skip. Instead of the race you'll jump directly to the results list with all zeroes.
Set bit 1 of this variable to enable the Barcode scan skip cheat. At any "ENTER BARCODE" screen, hold Select, then press A to set predefined Barcode data ("999999999") to use it in the game without need of the Barcodes.

Famista 2

(GEN) Ball speed mini-game (added 01.04.17):
At the title screen, hold B then press Start. Adjust throwing parameters, then pitch and catch the ball, the speed will be recorded.
Source: urawaza.in, gamefaqs.com

Famista 3

(BUR) Hidden text (added 01.04.17):
There are various copyright strings used for initializing the RAM partitions in this game:

   copyright 1993 yukihiko yagi

Used as common Cart RAM signature.

TAKA FUKAWA

Used as regular game save slots initializer.

TAKASHI FUKAWA

Used as the special team data signature.

Felix the Cat

(UNI) Weapon and stage select (added 05.04.17):
At the title screen intro animation before the "PUSH START BUTTON" message appears, press Right, A, Down, B, A, B, Down, A. A sound will confirm correct code entry. Now, during the game press Select to power up to the next weapon instantly, or on pause press A or B to select any stages, including the boss rooms.

Ferrari Grand Prix Challenge

Japanese version:

(BUR) Hidden text (added 05.04.17):
Among other unused text resources shared in both regional versions of this game, there is an odd string at the end of BANK 2 in the Japanese version:

SEARCH - NEM - NEWLAND

This string isn't present in the US version.

Fidgetts, The

All versions:

(GEN) Restart or quit stage (added 06.04.17):
Any time during the game, press Start + Up to open the Restart or quit stage menu.

(UNI) Staff roll (added 06.04.17):
At the title screen, press Select + B + Right. In the Japanese version the credits roll much shorter than in the US version.

(BUR) Game genie (added 06.04.17):

002‑CCA‑C4D (for the Japanese version)
002‑ED3‑C4D (for the US version)

Re-enables the Extra lives cheat. At the title screen press Start + A + B + Up. A screen will flash for a short time. Now you'll have extra 10 lives at the beginning of the game.

Japanese version:

(UNI) Secret message (added 06.04.17):
At the title screen, press B + Up once, then wait until the current copyrights message loop is over. The secret greetings from programmer will appear in place of the copyrights text. Due to completely lack of the copyright messages on the title screen in the US version, there is no similar secret message as well.

FIFA: The Road to the World Cup '98 (USA), World Cup '98 (Europe)

(FIX) Secret passwords (added 10.04.17):
All passwords are unlockable and given to you randomly after beating the Tournament mode of this game. All effects are exactly the same as in previous part (97) made by the same developers.

100PY	-	During the game, kicking the ball results in its crazy behaviour. It's moving without any physics, constantly changing direction.
M#NWTD	-	Max out player's team parameters instantly during the game (all are higher than the best team "T*HQ Tornados").
W#11*D	-	Slow down the ball speed for the rival team.
B11ND	-	No fouls for the player's team (if enabled in the Options).

Source: gamefaqs.com

FIFA International Soccer

(BUR) Hidden text (added 07.04.17):
There is the hidden version string at the beginning of the rom:

17 Dec 1994 14:17:55

Also, there is a common Probe software copyright string at the beginning of the sound engine:

(C)Probe

Source: tcrf.net

FIFA Soccer '96

(BUR) Hidden text (added 07.04.17):
There is the hidden version string at the beginning of the rom:

29 Sep 1995 19:25:56

Also, there is a common Probe software copyright string at the beginning of the sound engine:

(C)Probe

Source: tcrf.net

FIFA Soccer '97

(FIX) Secret passwords (added 10.04.17):
All passwords are unlockable and given to you randomly after beating the Tournament mode of this game.

K00KY	-	During the game, kicking the ball results in its crazy behaviour. It's moving without any physics, constantly changing direction.
B+T#*M	-	Max out player's team parameters instantly during the game (all are higher than the best team "T*HQ Tornados").
BR1CK#D	-	Slow down the ball speed for the rival team.
#*G+#	-	No fouls for the player's team (if enabled in the Options).

Source: gamefaqs.com

Final Fantasy Legend, The (USA), Makai Toushi Sa-Ga (Japan)

(GEN) Sound test (added 11.04.17):
At the title screen, hold Down + Select (for the US version) or Left + Select (for the Japanese version), and then additionally hold B, then wait for about 4-5 seconds and release all buttons. If done right, the Sound test will replace the title screen menu.
Source: gamefaqs.com, tcrf.net

Final Fantasy Legend II (USA), Sa-Ga 2: Hihou Densetsu (Japan)

(GEN) Sound test (added 11.04.17):
At the title screen, hold Start + Select, then press B.
Source: gamefaqs.com

Fire Dragon (Unlicensed)

(BUR) Hidden text (added 12.04.17):
There is a hidden copyrights string at the beginning of the ROM:

GOWIN FIRE DRAGON 199404

There may be more Shift-JIS encoded text near, investigate.

Fire Fighter

(FIX) Secret passwords (added 12.04.17):

00PRJ00	-	Level select and infinite lives. Press A + B + Select during the game to instantly complete the level.
PLQQ23J	-	Level 10 (game does not give password for this level)
JK22GVV	-	Level 11 (ending)
VXV55ZS	-	Level select. Press A + B + Select during the game to instantly complete the level.

Source: tcrf.net

Fish Dude (USA), Uoozu (Japan)

All versions:

(BUR) Hidden text (added 12.04.17):
There are hidden copyright string at the beginning of the ROM:

1990  SALIO & ANex

Source: tcrf.net

Japanese version:

(GEN) Secret passwords (added 12.04.17):
At the Stage number screen, select any stage greather than 1 using A. Press Start to start a password input mode. Enter one of the following words then hold Down and press Start to enable the secret feature.

STAF	-	Staff roll.
MSIC	-	Sound test.
FONT	-	Toggle between default small font and a larger one.
MODE	-	Options menu. You can select difficult, number of lives and toggle to inverted palette.
MAPS	-	Stage select.
XENA	-	Unlock levels A-C. Note, this is only enables these levels at the Stage number screen, but you still need to know a valid passwords to play them.

Source: makainyumon.web.fc2.com

US version:

(BUR) Game genie (added 12.04.17):
Due to passwords system changes in the US version, the secret passwords were disabled. But all code still sitting in the ROM unreferenced. There is no simple proper way to re-enable them, but you can try to access some of features somehow using the following Game genie codes. To enter the corresponding function, go to the password input screen and just press Start. Also as a result of hacky method of accessing you couldn't use some features, like selecting the levels or unlocking the A-C levels.

03F‑6FF‑5DF+32F‑70F‑A2A	-	Staff roll.
76F‑6FF‑5DF+33F‑70F‑A2A	-	Sound test.
9EF‑6FF‑5DF	-	Toggle font. Due to hacky method of accessing, it will garbled.
C9F‑6FF‑5DF+35F‑70F‑A2A	-	Options menu. You actually can make use of it.
38F‑6FF‑5DF+37F‑70F‑A2A	-	Stage select. Due to hacky method of accessing, won't go anywhere.

Fist of the North Star (USA), Hokuto no Ken: Seizetsu Juuban Shoubu (Japan)

(GEN) Parameters display (added 13.04.17):
At the mode selection menu, press Select + A to get to the parameters display menu. There are not only the level of characters will be displayed, but its experience points and attack/defence parameters. This code is described in the game's official manual.

(UNI) Password generator (added 14.04.17):
Note, that the game's password system uses the data's checksum to perform password permutation at the generation stage, but at the decoding stage there is no check against the real checksum. It's just permuting password back using the stored value. This password generator will generate actual game passwords, unless you use the "Checksum hack" option, where you can use your own checksum value to encode the password. Most of internet passwords for this game exploiting this feature somehow.

Flash, The

(GEN) Credits (added 17.04.17):
Normally, the Credits can be seen when the demo loop is over. But if you press B at the title screen, you can see the Credits instantly.

(GEN) Pause (added 17.04.17):
During the game, press Select + Start.

(FIX) Passwords (added 17.04.17):
To enter the password, at the title screen, press Select. Althought the password in this game is 10 characters long, only the first 7 are checked by the program. Here is the full list of acceptable street names with not important parts in braces:

"23 DELA"(NEY)	-	Level 2
"DENIM B"(LVD)	-	Level 3
"TRACK 2"(9)	-	Level 4
"99 PICA"(SSO)	-	Level 5
"INGOT L"(ANE)	-	Level 6
"7TH MAR"(KET)	-	Level 7
"TRACK 1"(2)	-	Level 8
"RUE LE "(DAY)	-	Level 9
"TIN ALL"(EY)	-	Level 10
"GORBY W"(AY)	-	Level 11
"TRACK 6"(6)	-	Level 12
"FUN HOU"(SE)	-	Level 13

(BUR) Hidden text (added 17.04.17):
There is no password or street name display for the first one Level of this game. But actually, its name is stored in the passwords list with index 0 and even checked by the password system, but can't be accepted, since the valid stage index should be non-zero. The street name is:

143 FIFTH

Also, there is an unused cutscene message

-(MORE: PRESS A)-

intended to be used when a special code is inserted in the cutscene line. But In the final release there are no such codes in any cutscene texts.
Source: tcrf.net

Fleet Commander VS

(GEN) Cease fire (added 17.04.17):
During the game, in the main game menu, enter "がいこう" ("Diplomacy") option, then select "メッセージにゅうりょく" ("Input message") option. Enter word "コウフクシマス" ("Surrender"). Return back to the main game menu and choose "END" option to instantly end the battle, following with the "CEASE FIRE" cutscene.

(UNI) Disable fog of war (added 17.04.17):
At the title screen menu, hold Select + B + Left. The cursor will jumping constantly on the menu items. Press A exactly that moment, when the cursor is pointing on the first option "1P. GAME", this little bit tricky. Another method to trigger this cheat is to set the cursor position to "LOAD GAME" option, press Select + B + Left at the same time and immediately after it (when cursor is changing its position), additionally press A (do not release previous buttons!). If done right, the game will start, from now all enemy units will be visible on the map permanently.

Flintstones, The

(GEN) Stage select (added 17.04.17):
Enter the "OPTIONS" menu, now select the "FX TEST" option and play the sounds: 25, 01, 02, 02, 01, 04, 01, 02, 02, 01, 04, 15. Now play any sound one more time to enable the cheat. Return to the title screen, the message "CHEAT ON!" will appear at the upper-right corner of the screen. Start a new game, the level/mini game select screen will appear. You can select and play any mini-game, watch the ending sequence, other game sequences and play from any act as well. Also this cheats enables the stage skip feature for most of the stages. During the game just press Select to advance to the next stage. Note, if one converts the numbers of the sounds needed to be played to their corresponding letter (e.g. 01 = A, 02 = B, etc.), it spells out "YABBA DABBA DO", Fred's catchphrase.
Source: tcrf.net

Flintstones, The: King Rock Treasure Island

(FIX) Title screen cheats (added 18.04.17):
All cheats should be entered at the title screen. If done right, a sound will confirm correct code entry.

Down, Down, Down, Down, Up, Up, Up, Up	-	Invert screen colors permanently.
Select, B, A, A, B, Select, B, A	-	Hidden mini-game after the game start.

Source: gamefaqs.com, tcrf.net

Football International (USA, Europe), Soccer (Japan)

(UNI) Secret mode (added 18.04.17):
At the title screen, put cursor to "2 PLAYERS" menu option, then hold Up + B and press A or Start to begin the game. This will force the "WORDL CUP" mode to begin and starts from the "TEAM SELECT" screen instantly, but instead it will be called "SECRET MODE". Here you'll be able to select the starting round of the tournament by selecting a corresponding team to play against.

(UNI) Always penalty kick (added 18.04.17):
Enter the "Secret mode" cheat as described above. At the team selection screen, select your team, then choose the team you want to play against, hold Select and press A. If done right, you'll jump directly to the round results screen with obviously 0-0 score, so this will force the penalty kick mode to begin.

(UNI) Ending (added 18.04.17):
Enter the "Secret mode" cheat as described above. At the team selection screen, press Up, Up, Up, Left, Left, Select.

(BUR) Hidden text (added 18.04.17):
There is a hidden string near the end of bank 3 repeated 10 times:

PC-8001 FOREVER

Fortified Zone (USA), Ikari no Yousai (Japan)

(GEN) Players switch (added 19.04.17):
During the game, hold Up, then press Select + Start to instantly switch between players without need to go to the options menu.

(UNI) Secret message (added 19.04.17):
At the "GAME MODE SELECT" screen, enter "SOUND BOY" mode. Choose "PROGRAM PLAY" mode and set any sequence of the music tracks to play. Start to play the program either in "THROUGH" or "REPEAT" modes, no matter. There is a piglet character walking on the screen all the time the music is playing. At some point, this piglet will stop and make a bow to the player for a very short time. Press A + Start at exactly that moment. This may be tricky, but if done right the message "BU !" will appear above the piglet. Need to mention, "SOUND BOY" actually was written for another game: "Hero Shuugou!! Pinball Party". The piglet and fire heads are characters from that game.

(FIX) Secret passwords (added 19.04.17):
Note, that there are no infinite lives/ammo passwords, only large amount of it at start. Also note, the second portion of passwords has a dupes with exactly the same effects but different names. Also all these passwords causes a HUD glitch if simple players switch button (Start) is used for the very first players switch on the level. All secret cheats as well as chibi female mode were totally scrapped from the US version.

Regular passwords for all versions Always start as male, default parameters.
CCCC (for the Japanese version) 1111 (for the US version)	-	Stage 1
TANK (for the Japanese version) 3375 (for the US version)	-	Stage 2
DRAG (for the Japanese version) 1681 (for the US version)	-	Stage 3
COMP (for the Japanese version) 1122 (for the US version)	-	Stage 4
For the Japanese version only Extra 240 medkits/bullets, max lives/bullets, flame thrower weapon.
AAAA (Male) BBBB (Female)	-	Stage 1
GUN? (Male) JEEP (Female)	-	Stage 2
CANO (Male) BIO! (Female)	-	Stage 3
BOMB (Male) ROBO (Female)	-	Stage 4
Always start as male, chibi female mode, default parameters. Simple players switch button code enabled: Start. Stage skip cheat enabled: hold Down, then press Select + Start.
YURI	-	Stage 1
KEI!	-	Stage 2
AMI!	-	Stage 3
RIE!	-	Stage 4
Chibi female mode. Extra 240 medkits/bullets, max lives/bullets, flame thrower weapon. Simple players switch button code enabled: Start. Stage skip cheat enabled: hold Down, then press Select + Start.
MINT or YOKO or MIA! (Male) MOMO or MAMI (Female)	-	Stage 1
ELI! or RISA or GAMI (Male) EMI! or JUN! (Female)	-	Stage 2
REI! or KAYO or RIKA (Male) MAI! or TAE! (Female)	-	Stage 3
SAKI or RUMI or ERI! (Male) YUU! or NAMI (Female)	-	Stage 4

Source: tcrf.net, gamefaqs.com

Frank Thomas Big Hurt Baseball

(UNI) Instant win (added 06.05.16):
Choose any game mode with scoring, start the game with "Play ball" option. Now, exit to the "Team Options" menu by pressing Start any time during the game and press Up, Down, Left, Right, Up, Down, Left, Right plus any other button to complete the sequence. A sound will confirm correct code entry. This will set the highest score to your team. Continue the game with "Play ball" option again to instantly win current round and skip to the next depending on the game mode you've played. Similar cheat can be found in other Baseball game from the same developers: "All-Star Baseball '99".

Frisky Tom

(BUR) Game genie (added 20.04.17):

C0C‑02C‑E6A+07C‑01C5DE6A+FAC‑00C‑C4D	-	Re-enables the Debug menu. Hold Select + Start once Frisky walks onto a stage, then press Up once and Down once in any order.
06D‑AAC‑F7E	-	Additionally to the previous codes use this one to enable the 6th unused line of the debug menu "BG PAL".

Source: tcrf.net

From TV Animation Slam Dunk: Gakeppuchi no Kesshou League

(BUR) Game genie (added 13.08.16):

620‑12F‑6EF

Re-enables the debug mode. Press B at the title screen. There are 7 options available from 1 to 7 correspondingly: Face test, Message test, Cutscenes test, Dunk Animations test, Offence/Defence test, Sound test, Game moves test. Presss A to enter any of tests, press Start to return back to the game.

Source: tcrf.net

From TV Animation Slam Dunk 2: Zenkoku e no Tip Off

(UNI) Field warping (added 15.08.16):
Either at the intro or at the title screen, hold Up + Left, then press Start to skip to the next screen (to the title screen if you press when the intro is played or to the main menu if pressed at the title screen). During the game, any time on the main field screen (except the initial ball toss), press Up, Up, Down, Down to warp current player forward to about 1/5 of the game field, but not further than the beginning of the 2-point zone. This works even if your currently controlled player has no ball in hands.

(UNI) Secret passwords (added 15.08.16):

WJUMP

Enables a Special game mode option at the title menu, which allows you to play any of 6 story mode stages as a single training stage. After this stage is over, you'll se only the game results, then return to the main menu. However, all intermission cutscenes will be displayed.

(BUR) Game genie (added 15.08.16):

622‑08F‑6EF

Re-enables the debug mode. Hold B and reset the console, you'll see a number representing one of the internal game handlers. Some of the game handlers are for debugging and can't be accessed during the game: 2 - SGB test screen (note, that garbage it displayed is because it uses the game's code instead of an actual graphics data), 4 - Hidden unused UFO mini-game, used in "Captain Tsubasa J", 5 - Attack/Defence test, 13 - Sound test, 15 - Animations test, 21 - Halftime test, 22 - Face expressions test. Press A to enter one of the selected handlers, press Start to return back to the game.

Source: tcrf.net

Fushigi no Dungeon: Fuurai no Shiren GB - Tsukikage Mura no Kaibutsu

(GEN) Cart RAM clear (added 21.04.17):
At the title screen, press Up, Left, Down, Up, Left, Right, Down, B, A, B, A, Select. A sound will confirm correct code entry. This should reinitialize the Cart RAM and reset all previous saves and settings. Most probably this cheat were described in the game's manual.

Galaga (Arcade Classic No. 3, Namco Gallery Vol.1)

(UNI) Free dual ship (added 29.06.16):
During any Challenging Stage after Stage 32, any time pause the game, then quickly press Down, Up, A, Left ("DUAL") to get an instant dual mode ship. The pause between keypress must be less than 1/4 second.

Game & Watch Gallery (USA, Europe), Game Boy Gallery (Japan), Game Boy Gallery 2 (Australia)

(GEN) Cart RAM clear (added 22.04.17):
At the title screen, press Up, Up, Down, Down, Left, Left, Right, Right.
Source: gamefaqs.com

Game & Watch Gallery 2 (USA), Game Boy Gallery 2 (Japan), Game Boy Gallery 3 (Australia)

(GEN) Pause frame pattern change (added 22.04.17):
During the game, when the CONTINUE/RETRY/EXIT menu is displayed, you can cycle throught a large amount of different animated patterns with the B button.
Source: urawaza.in

(GEN) Cart RAM clear (added 22.04.17):
At the title screen, press Up, Up, Down, Down, Left, Left, Right, Right. A sound will confirm correct code entry. In case there are an Interrup saved games from the previous play, this code will erase only the other games statistic, and additionally begin the title demo sequence instantly.
Source: urawaza.in

(BUR) Game genie (added 24.04.17):

201‑EEF‑B3A (for the US version)
201‑DBF‑B3A (for the Japanese version)

Re-enables a complex set of the Debug menu which allows you to debug a lot of games parameters.

Source: tcrf.net

Game Boy Gallery (USA)

(UNI) Cheat mode (added 25.04.17):
To trigger this cheat on, for any game selected, at the game menu, put cursor to "START" option, hold Select + B + Up and press A to Start. If done right, the starting jingle will be different. From now you'll be able to manipulate the game's scores. Each game has its own unique score edition inputs and effects, all described in the table below. Note, the TOP scores are disabled in cheat mode, so you couldn't keep your "records".

Ball	-	Press Up to set the lowest digits of the scores to 99. So you can only "skip" to the next 100 points every time you get a point in the game.
Vermin	-	Press Up or Down to increase your scores to 100 or 10 points respectively.
Flagman	-	Press A or B to increase your scores to 1 to 10 points respectively during the Flagman show time. When there is the time to answer, the correct number will be hinted at the top-left side of the screen.
Manhole	-	Press B, same as in the "Ball" game.
Factory	-	Press Up or Down, same as in the "Vermin" game.

Game Boy Wars (Japan), Game Boy Wars Turbo (Japan Rerelease), Game Boy Wars Turbo: Famitsu Version (Japan Rerelease)

(GEN) Cart RAM clear (added 25.04.17):
At the main game menu, hold A + B, then press Left, Left, Right, Start.

Game de Hakken!! Tamagotchi 2

(GEN) Cart RAM clear (added 08.05.18):
During the game, open "Memory book" in Mika-chu's room. Hold Up + Select and press A. Release all buttons, game will reset with all data clear.

(GEN) Sound test (added 10.05.18):
Win any contest. During the game go to the stereo player in Mika-chu's room and press A.
Source: gamefaqs.com

(GEN) Picture book (added 10.05.18):
Win all contests (not sure how exactly). During the game go to the bookshelves with bunny in Mika-chu's room and press A.
Source: urawaza.in

(BUR) Unused cheat (added 10.05.18):
There is a chear leftover similar to "Extra status indicators" cheat in the first part of this game. There are no code associated for it, it seems it was completely removed but the control variable and main code still there. Modify RAM address $D455 to any non-zero value to enable an extra info displaying at the "STATUS" screen during the game.

Game de Hakken!! Tamagotchi: Osutchi to Mesutchi

(GEN) Cart RAM clear (added 10.11.19):
At the game start menu, press Right + Select + B. A sound will confirm correct code entry.

(BUR) Game genie (added 10.11.19):

1C4‑E6B‑E62

Re-enables some unknown simple editor screen. At the title screen, press Select.

Game genie V1.17 BIOS (Unlicensed)

(FIX) Cheat sequences (added 29.09.16):
At the main GG entry screen, enter one of the following button sequences to get the corresponding effect.

Up, Down, Left, Right	-	Secret message 1.
B, A, Left, Right, Select	-	Secret message 2.
Up, Up, A, B, A, Down, Down	-	Secret message 3.
Right, Up, Down, Up, Left, Up, Down, Up	-	Secret message 4.
B, A, B, Right, Left, Down, Up	-	Secret message 5.
A, A, A, A, B, B, B, Start	-	Secret message 6.
Right, Left, Right, Left, Down, Down, Up, Up	-	Secret message 7.
Down, Up, Down, Down, Left, Right, Left, Start	-	Secret message 8.
A, B, A, B, B, A, A, Select	-	Secret message 9.
A, Left, Left, A, B, Right, Right, B	-	Toggles the large fonts upside-down flip.
B, Down, Down, A, B, Up, Up, A	-	Toggles the small fonts upside-down flip.

Source: tcrf.net

(GEN) Secret words (added 29.09.16):
At the main GG entry screen, input one of the following words as Code 3, then press A on the first space of Code 1. Note, that "-" means that this character is erased with B button.

DEAD-----	-	Toggle vertical screen shake.
ABACADABA	-	Toggle horizontal screen shake. Both codes may be combined.
F154-----	-	Toggle the main selection cursor into the fish and back into the hand.
FACE-----	-	Toggle the GG cursor into the face and back into the cross.
1984-----	-	"Explode" secret message.
BAC4-----	-	Toggle inversion of D-Pad buttons.
1CE‑---‑-	-	Never release D-Pad buttons.
414E5----	-	Horizontal screen wave effect.
6EE6-----	-	Vertical screen wave effect

Source: RFredW

Game of Harmony, The

(UNI) Stage skip (added 24.04.17):
During the game, point the player's arrow straight up and press Up once, press B to point the arrow in opposite direction, then press Down. If done right, you'll hear the sound every time you press the direction button, from now, press Select to skip to the next level up to the last one.

Ganbare Goemon: Sarawareta Ebisumaru

(GEN) Sound test (added 27.04.17):
After the game over screen, at the continue menu, press Up, Up, Down, Down, Left, Right, Left, Right, B, A.
Source: gamefaqs.com

(UNI) Password generator (added 27.04.17):
There are icons instead of letters in this password system. In this password generator icons are numbered left to right in the top row as 1,2,3,4 and as 5,6,7 in the bottom row.

(BUR) Game genie (added 27.04.17):

2FC‑86F‑7FE

Re-enables the quite simple and partially non-functioning Debug screen. The values are uninitialized at start with this code. First two values represents the stage index and location respectively. Invisible option correspond to the sound player music index, but there are no code to start the music from there. The last visible options changes some game var, but it reinitialized when the game starting, so does not effect at all here.

Ganso!! Yancha Maru

(BUR) Game genie (added 12.05.18):

200‑DFB‑80A

Re-enables the debug cheat functionality. To use it, hold A + B + Select + Up + Right and power on the console. At the title screen, hold Left and press Start. Also, you can hold either A or B or both in addition to Left before hitting Start. Indication that the debug mode is enabled is there no "PAUSE" text on the pause screen.
For any combinations of buttons, during the game, press Select to instantly complete any level except 4-3.
If A were held, the timer is stopped.
If B were held, invincibility enabled.

Garms: Operation Gundam

(GEN) SD Picture Book cheats (added 07.05.18):
At the Title menu, shoose "ＳＤダイズカン" ("SD Picture Book"), then "Ｇ・アームズ　グン" ("G-Arms Group"), now finally open "コマンドガンダム" ("Commander Gundam"). Wait for the message on the screen to fully appear. Now, press one of the following buttons to get the corresponding effect:

Left	-	Sound test
Down	-	Stage select

Source: tcrf.net, urawazagame.com

(BUR) Hidden text (added 07.05.18):
There is some ddevelopers copyright and build date text at the beginning of the ROM:

****************
*COMMAND GUNDAM*
*    G-ARMS    *
*  1991/02/13  *
****************

   Written by
Yoshitaka Ohsawa

Source: tcrf.net

GB Genjin Land: Viva! Chikkun Oukoku

(GEN) Ending (added 03.05.17):
Start a new game, buy a ticket and walk into the Theme park. Go to the exit way (middle-bottom), when asked to accept or cancel, press and hold A + B + Select instead. This is little bit tricky, because two of these buttons are used for either the exit from this menu or for the accept the selection. If done right, the ending sequence will start instead of the outro cutscene.
Source: urawaza.in

(GEN) CRT test screen (added 03.05.17):
Start a new game, buy a ticket and walk into the Theme park. Go to the exit way (middle-bottom), when asked to accept or cancel, select to accept the exit. Now, when the screen with Genjin on the log in the middle of the sea appears, press and hold A + B + Select and wait until the CRT test pattern appears on the screen.
Source: urawaza.in

(GEN) Title screen cheats (added 03.05.17):
At the title screen, put cursor to the second menu option ("Warming up exercises"), hold one of the button combinations from the table below, then press A or Start.

Left + Select	-	Sound test.
Right + Select	-	Play any mini-game with any level of difficulty.

Source: urawaza.in

GB Pachi-Slot Hisshouhou! Jr.

(BUR) Hidden text (added 03.05.17):
The CRAM initialization routine in this game uses as a signature the following string:

Yamazaki1hiroshi

GBKiss Mini Games

(UNI) Secret passwords (added 12.05.17):
This is a special cartridge with the GB KISS menu only (the other games with GB KISS support has it as the additional option inside the game, however, the menu code exactly the same for all games and cartridges). There are several games and additional files contains in this particular cartridge, but most of them are locked by passwords for some unknown reason. Also not known (at least by me), where they should've been publish those secret passwords and whether any of it is available in public now. So, consider all these password as a secret now, until someone told me it's not true. Following table contains the complete list of the files on this cartridge and how to unlock it. All games are separated by 6 categories, only the first one is unlocked from the beginning. To input password, at the main GB KISS menu, press B, then select "PASSWORD INPUT" option. If done right, the corresponding menu option will appear in the list. To transfer the game to the CRAM, choose any category, then press Start on selected game. Note, there are several data files tha need the main program in order to work properly, so you must put them in CRAM together. Every file takes up to 8Kb of the CRAM, from 32Kb in total, so you can't load all the files at once in CRAM.

Category	\|	Unlock password	\|	List of games/files	\|	Notes
キャラバンバージョン　５ゲーム ("Caravan version 5 games")	\|	-	\|	モグってナンボ ("Mogutte Nanbo") ＳＡＭＥＧＡＭＥ　ＫＩＳＳジャカジャカジャンプでポン ("Jaka-Jaka-Jump") がんばれマグネッシＭＡＩＮ ("Drive" main file) がんばれマグネッシＤＡＴＡ ("Drive" data file) ＳＨＯＯＴＩＮＧ　ＭＡＳＴＥＲ	\|	Both "Drive" files should be in CRAM at the same time in order to work properly.
キスモン＆バケちゅリレーほか４ ("Kissmon&Bucket Relay and 4more")	\|	KISSMON	\|	ＫＩＳＳ　ＭＯＮＳＴＥＲストップウォッチ＆タイムー ("Stop Watch") かんい　でんたく ("Calculator") バイオリズム ("Biorhythm") サウンド　ルーム ("Sound test") バケちゅリレー("Bucket Relay")	\|	"KISS MONSTER" is an earlier version of the same tool, included in Japanese "Pocket Bomberman" (the only available mini-game there by default).
１５パズル＆キャノン　ほか４こ ("Puzzle 15&Cannon and 4 more")	\|	CANNON	\|	アイコンデータしゅう ("Icons data") アイコン　エヂィター ("Icons editor") １５パズル＆パネル ("Puzzle 15") スロット　マシン ("Slot machine") キャノンボール ("Cannon Ball") ポーカー ("Pocker")	\|	-
バイナリーランド＆ＢＪはか２こ ("Binary Land&BJ and 2 more")	\|	BINARY	\|	ＷＯＲＭバイナリーランド ("Binary land") ルーレット ("Rulette") ブラックジャック ("Black jack")	\|	-
ミニゲームがぞういれかえデータ ("Mini games picture replacement data")	\|	GAMEDATA	\|	１５パズル　データ１ ("Puzzle 15" data 1) １５パスル　データ２ ("Puzzle 15" data 2) １５パズル　データ３ ("Puzzle 15" data 3) モグってナンボ　データ ("Mogutte nanbo" data) スコップウォッチすうじデータ ("Stop watch" data)	\|	Expansion packs for the previous mini-games.
ＧＢ　ＫＩＳＳ　ＴＯＯＬＳ	\|	KISSTOOL	\|	ＳＲＡＭ　ＧＥＴ＆ＣＬＲＦＩＬＥ　ＡＬＬ　ＤＥＬＥＴＥＣＨＡＲ　ＤＵＭＰ	\|	Sends the CRAM or CHR data via IR port to PC or just wipe all CRAM data (keep settings and unlocked passwords).

Gear Works

(UNI) Secret passwords (added 15.05.17):
At the Code entry screen first enter "0105" as a password and press B. Start a new game, press A + B to commit suicide three times to lose all lives and return back to the title screen. Now, at the Code screen, enter password "1967" and start a new game again. From now, the A + B combination will skip current stage instead of restarting it with losing a life. Also, you'll get extra 9 lives and 99 of every items. The password numbers are clearly the someone's birth date.

Gekitou Power Modeller

(UNI) Title screen cheats (added 12.06.18):
At the Capcom logo, press Up, Up, Right, Right, Down, Down, Left, Left, a sound confirm correct code entry. This cheat is enabled permanently and cheat flag stored in Cart RAM. From now, at the title menu several extra options are available. To choose one of them, put cursor on the corresponding option, hold particular button and then press either A or Start. The option/button combinations described in table below.

Menu option	\|	Button	\|	Effect
"START"	\|	Right or Left	\|	Free battle mode. Choose any robot character, then fight with every other robots.
"CONTINUE"	\|	Left	\|	The same as previous, but you can choose robots available in a players roster for currently saved game.
"CONTINUE"	\|	Right	\|	Sound test in a play list mode. Similar to the "OPTIONS" menu Sound test but you couldn't select music tracks, only repeat currently played one with B. There is no "MESSAGE SPEED" option here. Also this Sound test starts with a Capcom logo jingle otherwise unavalilable in a regular Sound test.
"VS"	\|	Right	\|	Battle watch mode. Random CPU controlled robots will fight each other.

Additionally, this cheat enables a manual music control at the battle mode. Pause the Battle, then use Left/Right to choose background music, press A to play it. Press B to fade music out or press Up to stop music immediately. There are also several features available in multiplayer and SGB modes, need to investigate.

Gem Gem

(GEN) Secret names (added 16.05.17):
Enter one of these words as a player's name.

たまやま

Sound test.

Source: makainyumon.web.fc2.com

(BUR) Game genie (added 16.05.17):
There are a lot more Secret names were planned, or was removed in the release version. This is unknown what names exactly they used before, all letters are erased now, but with this codes you can make simple replacement to use as the Secret name and get the corresponding effect. Note, the rest of the name should be filled with special SPACE symbol.

011‑E2D‑E6A	-	Secret name "あ＿＿＿" - Area 2 warp
021‑EAD‑E6A	-	Secret name "い＿＿＿" - Area 3 warp
031‑F2D‑E6A	-	Secret name "う＿＿＿" - Area 4 warp
041‑FAD‑E6A	-	Secret name "え＿＿＿" - Area 5 warp
052‑0AD‑E6A	-	Secret name "お＿＿＿" - Ending

Genki Bakuhatsu Gambaruga

(GEN) Unlock extra multiplayer characters (added 02.05.17):
At the title screen, choose "たいせん" ("Taisen") mode (linked multiplayer), then at the character selection screen, highlight "ガンバルガー" ("Ganbaruga") character and press Right, Left, Right, Left, A, B, A, B. Two new characters "ゴクアーク" ("Gokuaku") and　"ヤミノリウス" ("Yaminorius") will be available to select as playable fighters. This code is unlockable and given to you after completing the game for the first time.

Ghostbusters II

Japanese version:

(GEN) Continue screen cheats (added 29.05.17):
Start a new game, loose all lives. After the game over screen at the Continue menu, put cursor to the "END" option, then hold Select and press one of the buttons from table below to get the corresponding effect.

A	-	Ending
B	-	Sound test

Source: makainyumon.web.fc2.com

GI King!: Sanbiki no Yosouya

(GEN) Girl opponents (added 22.04.17):
At the title screen, press A + B + Start.
Source: urawaza.in

(UNI) Sound test (added 22.04.17):
Hold Down, then power the console on.

Ginga: Card & Puzzle Collection (Tornado Appetizer)

(UNI) Test menu (added 29.05.17):
Any time during the game, hold Up + Left, then do Soft-reset (A + B + Select + Start at the same time). The menu allows you to listen to the music and sound effects, see the Stage complete animations and the Staff roll.

Go Go Ackman

(UNI) Title screen cheats (added 30.05.17):
At the title screen, hold one of the button combinations from the table below, then press Start to get the corresponding effect.

A + B + Select	-	All powerups
B	-	Stage select

Go! Go! Hitchhike

(GEN) Cart RAM clear (added 31.05.17):
At the title screen, press Down + B. You'll be prompted whether you want to erase the saves on the Cart RAM or not.
Source: urawaza.in

Go! Go! Tank

(GEN) Title screen cheats (added 01.06.17):
At the title screen menu, press Left, Up, Right, Up, Left, Left, Up, Right, Up, Left, Up. Now the cheat mode is enabled. Available options are described in the table below.

Press Left once.	-	Enable invincibility.
Press Right once.	-	Extra 7 lives at the game start.
Press B up to 10 times.	-	Select a starting Stage.

Source: urawaza.in

Goal! (USA, Europe), Jaleco J.Cup Soccer (Eerly Japan), Takeda Nobuhiro no Ace Striker (Japan Rerelease)

All Japanese versions:

(UNI) Debug menus:
All cheats should be entered at the title screen, before the message "PUSH START BUTTON" appears. Also all codes should be entered quickly, without pauses between two buttons. Note, there are two title screens in the Rerelease version, code should be entered on the first one.

US version:

(UNI) Game genie:

001‑9CF‑E6E

In the US version the debug menu button sequences are disabled, but all conding and data are still in the ROM. Use this code to enter the complex debug menu at the game boot. To access the simple menu version, additionally to this code set the RAM address 0xC100 to 1.

Source: tcrf.net

Godzilla (USA), Godzilla-kun: Kaijuu Daikessen (Japan)

(GEN) Sound test (added 01.06.17):
During the game, hold A + B + Start, then press Select.
Source: urawaza.in

(UNI) Secret passwords (added 01.06.17):
Enter one of following passwords in "PASSWORD 18" mode to see one of the developer's messages. Note, "+" symbol means you need to skip this char with "->" arrow.

D#RR=N+++ C/#TS++++ (for the US version only)	-	Message to Coats
&?K1N/R1+ T/+N/R1=+ (for the US version) YUK1N0R1+ T0+N0R1E+ (for the Japanese version)	-	Message to Nori
PR/GR#M=R S+FR1=NDS (for the US version) PR0GRAMER S+FR1ENDS (for the Japanese version)	-	Message to Friends
TEST+++++ PLAYERS++ (for the Japanese version only)	-	Message to Test players

(UNI) Cheat mode (added 01.06.17):
Enter any of the Secret passwords described above. During the game, press Select to get to the game menu. Hold A + B and press one of the following combinations to get the corresponding effect.

A	-	Toggle invincibility on or off.
A + Right	-	Jump right on the level's map.
A + Left	-	Jump left on the level's map.
A + Up	-	Jump up on the level's map.
A + Down	-	Jump down on the level's map.

Golf

(GEN) Training mode (added 04.06.17):
At the title screen, for "1PLAYER" option, hold Down, then press Start to start a new game in a Training mode.
Source: gamefaqs.com

(GEN) Cart RAM clear (added 04.06.17):
At the title screen, press Select to go to the Records screen. Hold A + B, then enter Up, Down, Left, Right.

Goukaku Boy GOLD: Shikakui Atama o Maruku Suru - Kanji no Tatsujin

(UNI) Unlock Devil tournament (added 06.06.17):
At the starting logo screens, before the title screen appears, press Left, Left, Right, Right, Down, Down, B. A sound will confirm correct code entry. In the main game's menu, the menu option "?" will appear, enter it and after a short briefing it will turns to a secret "まおう大会" game.

Goukaku Boy GOLD: Shikakui Atama o Maruku Suru - Keisan no Tatsujin

(UNI) Unlock Devil tournament (added 06.06.17):
At the starting logo screens, before the title screen appears, press Left, Left, Right, Right, Down, Down, B. A sound will confirm correct code entry. In the main game's menu, the menu option "?" will appear, enter it and after a short briefing it will turns to a secret "まおう大会" game.

Goukaku Boy Series: 99 Nendo Ban Eitango Center 1500

(BUR) Hidden text (added 03.03.17):
There is a hidden copyright string at 0x61 in the ROM:

1997 April. complete.Making by C-lab.co.,ltd.

Goukaku Boy Series: Eijukugo Target 1000

(BUR) Hidden text (added 03.03.17):
There is a hidden copyright string at 0x61 in the ROM:

1997 Feb. complete.Making by C-lab.co.,ltd.

Goukaku Boy Series: Eiken 2kyuu Level no Kaiwa Hyougen 333

(BUR) Hidden text (added 02.08.18):
There is a hidden copyright string at 0x61 in the ROM:

PROGRAMMED BY hide@sun-tec.co.jp

Goukaku Boy Series: Eitango Target 1900

(BUR) Hidden text (added 03.03.17):
There is a hidden copyright string at 0x61 in the ROM:

1997 October complete.Making by C-lab.co.,ltd.

Goukaku Boy Series: Gakken - Kanyouku Kotowaza 210

(BUR) Hidden text (added 27.09.17):
There is a hidden copyright text at 0x61 in the ROM:

PROGRAMMED BY TOKI

Goukaku Boy Series: Gakken - Rekishi 512

(BUR) Hidden text (added 02.08.18):
There is a hidden copyright text at at 0x61 in the ROM:

PROGRAMMED BY minoru(7/30-0)

Goukaku Boy Series: Gakken - Yojijukugo 288

(BUR) Hidden text (added 06.06.17):
There is a hidden copyright text at the beginning of the ROM:

PROGRAMMED BY TOKI

Goukaku Boy Series: Kirihara Shoten Hinshutsu Eibunpou Gohou Mondai 1000

(BUR) Hidden text (added 14.06.17):
There is a hidden credits text at the beginning of the ROM:

PROGRAMMED BY minoru(12/18-0)

Goukaku Boy Series: Koukou Nyuushi Derujun - Chuugaku Eijukugo 350

(BUR) Hidden text (added 01.09.16):
There is a hidden copyright string at 0x61 in the ROM:

1997 May. complete.Making by C-lab.co.,ltd.

Goukaku Boy Series: Koukou Nyuushi Derujun - Chuugaku Eitango 1700

(BUR) Hidden text (added 01.09.16):
There is a hidden copyright string at 0x61 in the ROM:

1997 April. complete.Making by C-lab.co.,ltd.

Goukaku Boy Series: Koukou Nyuushi Derujun - Kanji Mondai no Seifuku

(BUR) Hidden text (added 02.08.18):
There is a hidden copyright string at 0x61 in the ROM:

PROGRAMMED BY TOKI

Goukaku Boy Series: Koukou Nyuushi Derujun - Rekishi Nendai Anki Point 240

(BUR) Hidden text (added 02.08.18):
There is a hidden copyright string at 0x61 in the ROM:

1997 May. complete.Making by C-lab.co.,ltd.

Goukaku Boy Series: Koukou Nyuushi Derujun - Rika Anki Point 250

(BUR) Hidden text (added 02.08.18):
There is a hidden copyright string at 0x61 in the ROM:

PROGRAMMED BY minoru(7/30-0)

Goukaku Boy Series: Nihonshi Target 201

(BUR) Hidden text (added 03.08.18):
There is a hidden copyright string at 0x61 in the ROM:

1997 October complete.Making by C-lab.co.,ltd.~

Goukaku Boy Series: Shikakui Atama o Maruku Suru - Kokugo Battle Hen

(BUR) Hidden text (added 03.08.18):
There are two hidden copyright strings at 0x61 and 0x000080 in the ROM:

PROGRAMMED BY TOKI

and

Programmed by kuny / 2001.05.09.ver.1.00.( T-T)/

Goukaku Boy Series: Shikakui Atama o Maruku Suru - Rika Battle Hen

(BUR) Hidden text (added 03.08.18):
There is a hidden copyright string at 0x61 in the ROM:

Programmed by kuny / 2001.05.09.ver.1.00.( T-T)/

Goukaku Boy Series: Shikakui Atama o Maruku Suru - Sansuu Battle Hen

(BUR) Hidden text (added 03.08.18):
There is a hidden copyright string at 0x61 in the ROM:

PROGRAMMED BY minoru(9/14-0)

Goukaku Boy Series: Shikakui Atama o Maruku Suru - Shakai Battle Hen

(BUR) Hidden text (added 03.08.18):
There are two hidden copyright strings at 0x61 and 0x000080 in the ROM:

PROGRAMMED BY TOKI

and

Programmed by kuny / 2001.05.09.ver.1.00.( T-T)/

Goukaku Boy Series: Shikakui Atama o Maruku Suru - Suuji de Asobou Sansuu Hen

(BUR) Hidden text (added 03.08.18):
There is a hidden copyright string at 0x61 in the ROM:

PROGRAMMED BY minoru(2/19-0)

Goukaku Boy Series: Yamakawa Ichimonittou - Nihonshi B Yougo Mondaishuu

(BUR) Hidden text (added 03.08.18):
There is a hidden copyright string at 0x61 in the ROM:

Making by C-lab.

Goukaku Boy Series: Yamakawa Ichimonittou - Sekaishi B Yougo Mondaishuu

(BUR) Hidden text (added 03.08.18):
There is a hidden copyright string at 0x61 in the ROM:

Making by C-lab.

Goukaku Boy Series: Z Kai - Kyukyoku no Kobun Tango

(BUR) Hidden text (added 03.08.18):
There are a couple of hidden copyright strings at 0x76 in the ROM:

Produce by imagineer

Program by Minoru-N

1998-08-18 Start.

Gradius: The Interstellar Assault (USA), Nemesis II: The Return of the Hero (Europe), Nemesis II (Japan)

(BUR) Game genie (added 07.06.17):

CDE‑7DF‑E65+00E‑84F‑E69 (for the US version)
CDE‑45F‑E65+00E‑4CF‑E69 (for the Japanese version)

Re-enables the unsed "DEMO" screen, possibly used for Prototype builds.

Grander Musashi RV

(GEN) Cart RAM clear (added 08.06.17):
At the title screen, press Left, Left, Right, Right, Up, Up, Down, Down, B. A sound will confirm correct code entry.

Great Greed (USA), Vitamina Oukoku Monogatari (Japan)

(GEN) unlockables (added 07.06.17):
Complete the game to unlock Sound test and Monsters book.
Source: gamefaqs.com

(BUR) Hidden text (added 07.06.17):
There is a generic Namco copyright text at the beginning of the ROM, partially used for RAM initialization signature:

COPYRIGHT 1992 NAMCO LTD. ALL RIGHT RESERVED

HAL Wrestling (USA), Pro Wrestling (Japan)

(GEN) Continue (added 08.06.17):
At the title screen, select "1 PLAYER" mode, hold Up + Select and press A. Now, when loose any round, you'll start fighting from the beginning with current character instead of jump to the game over screen.
Source: urawaza.in

Hammerin' Harry: Ghost Building Company (USA), Daiku no Gen-san: Ghost Building Company (Japan)

(FIX) Stage select (added 08.06.17):
At the title screen, when the "PUSH START" message is displayed, press and hold A + B + Up + Right + Start. While holding all these buttons, wait for the screen turns blank. Now, press Select a number of times corresponding to the desires starting Stage number from 2 to 19 (including bosses). Every time you press Select a sound effect will be heard.
Source: jp.wazap.com

(GEN) Pause cheats (added 08.06.17):
During the game, press and hold A + B + Select + Start. If done right, the background music won't fade. While holding all these buttons, enter one of the combinations from the table below to get a corresponding effect. Every time you press the correct button in sequence, various game sound effects will play. If one of the buttons pressed incorrectly, then music will fade, and game jumps to generic pasue mode, so you should press Start here and enter all codes again.

Right, Left, Right, Left, Down, Down, Up, Up	-	Refill health.
Up, Down, Up, Down	-	Instant Game over.
Down, Down, Down, Down, Up	-	Toggle the Slow down mode on or off.

(BUR) Hidden text (added 08.06.17):
Here is a hidden version string at the beginning of the sound engine code, the same an all regional versions:

** Ver 6.04 **

Source: tcrf.net

Harvest Moon GB (USA), Bokujou Monogatari GB (Japan)

(BUR) Game genie (added 23.07.16):

001‑E3F‑6EA
1FF‑819‑E66 (additional code for the US version)

Re-enables a complex debug menu. In the Japanese version it is fully functional, the US version however has most of the options disabled and invisible. Use additional code to re-enable all options somehow in the US version.

Source: tcrf.net

Hayaoshi Quiz: Ouza Ketteisen (The King of Quiz)

(GEN) Secret game (added 09.06.17):
At the title screen, press Up, Up, Left, Left, A, B, Down, Start. A new option will appear in the bottom-left corner of the main game's menu.
Source: urawaza.in

(BUR) Game genie (added 09.06.17):

1A1‑7EB‑F7A

Re-enables the Quiz test mode. Select the theme with Up/Down, a question with Left/Right and display it along with the correct answer indication with A. Press Start to exit back to the title screen.

Heavyweight Championship Boxing (USA), Boxing (Japan)

All versions:

(UNI) Maximum power (added 27.07.16):
Start either a new single player or a two players game. At the player's character selection screen press Up three times and Down three times in any order and finally press Select. Continue to setup your character. At the Power management screen, press Up 3 more times and then Select. If done right, the main power meter will be full and you'll be able to set up the max parameters to your character.

(UNI) Extra 255 continues (added 27.07.16):
Start a new single player game. At the Finish blow select screen, hold Down + Select + Start, then press A. If done right, the limit of the continues will be increased up to 255 instead of 3, so virtually you'll have an unlimited continues.

Japanese version:

(UNI) Easter egg (added 27.07.16):
Start a new single player game. As you may notice, the Round number screen will show you the Bunny girl scrolled higher and higher up with every round. The maximum position reached at 12th round. While 12th round screen is displayed, hold Down and quickly press A or B to scroll the Bunny girl up to 24 more lines, revealing the full picture. Althought the US version has this girl fully drawed as well, the easter were removed and you couldn't see the full picture during the game.

Heisei Tensai Bakabon

(GEN) Suicide (added 12.06.18):
In-game, hold Select then press Start to commit suicide.
Source: urazawa.in

Hercules

(GEN) Secret passwords (added 10.06.17):

CRDTS

Credits.

Source: gamefaqs.com

Hero Shuugou!! Pinball Party

(UNI) Secret message (added 13.06.17):
At the "GAME MODE SELECT" screen, enter "SOUND BOY" mode. Choose "PROGRAM PLAY" mode and set any sequence of the music tracks to play. Start to play the program either in "THROUGH" or "REPEAT" modes, no matter. There is a piglet character walking on the screen all the time the music is playing. At some point, this piglet will stop and make a bow to the player for a very short time. Press A + Start at exactly that moment. This may be tricky, but if done right the message "BU !" will appear above the piglet. This "SOUND BOY" was reutilized later in another game by the same developer: "Ikari no Yousai".

(BUR) Extra Much push attempts (added 13.06.17):
When the "GAME OVER!!" message is displayed on the screen, press A + B + Select. This will gives to you an extra 3 "MUCH PUSH A" bonuses during the game. However, this bonus happened only right before the Game over, so you just couldn't use all three of them in one run. When you return to Continue screen, the bounus counter will be reset to the default value 01 or may be restored to 03 with this cheat again. So, all this it seems mostly useless.

Hiden Inyou Kikouhou: Ca Da

(UNI) Sound test (added 22.07.16):
At the title screen, press Down + B.

Higashio Osamu Kanshuu Pro Yakyuu Stadium '92

(GEN) Secret teams (added 13.06.17):
At the Team select screen, while selecting CPU team, press Up + Select. If done right, an extra 3 special teams select screen will appear.
Source: urawaza.in

High Stakes Gambling

(UNI) Credits (added 13.06.17):
At the title screen, press Select + B.

Hit the Ice: VHL - The Official Video Hockey League

(UNI) Animations test (added 14.06.17):
Start a new game either in a Championship or VS. Play modes. Before the game starts, when the "PERIOD START" / "FACE OFF" messages are displayed, hold Select + Up for a second until the menu appears. You can see the animation sequences for various game events. There is no exit from this mode, and it seems this is just a debug leftover, which developers forgot to remove.

Hoi Hoi: Game Boy Ban (Japan), Stop That Roach! (USA)

(BUR) Game genie (added 14.06.17):
Both codes replaces the "NEW GAME" option at the title screen with a corresponding test. There were a button codes assigned for both tests, but they are not checking in all release versions. The US version has additional option in the Anim test allowing you to return to the title screen, which you couldn't in the Japanese version.

B16‑95E‑D59+456‑96E‑D5A (for the US version) 2D6‑44E‑D59+466‑45E‑D5A (for the Japanese version)	-	Sound test (Select + Up cheat in the US version, Select + B + Left + Up - in the Japanese version)
3A6‑95E‑D59+466‑96E‑D5A (for the US version) B66‑44E‑D59+466‑45E‑D5A (for the Japanese version)	-	Anim test (Select + Down cheat in the US version, Select + B + Left + Down - in the Japanese version)

Holy Bible, The: King James Version (Wisdom Tree, Unlicensed)

(GEN) Word Match Game Level select (added 18.11.18):
At the Word Match Game Title screen, hold Up, then press Select to increase starting game level.
Source: gamefaqs.com, tcrf.net

(UNI) Checksum test (added 18.11.18):
At the main menu, press Left 8 times. A sound informs you when checksumming started and finished. Then the resulting checksum will be displayed instead of the ROM version on the same screen.

Home Alone 2: Lost In New York

(UNI) Secret items (added 15.06.17):
There are three Secret items in this game. Each called "[Name] Magic", where "[Name]" is one of the dev names, and gives to you one of the regular power-up items permanently. All of them can be acquired exactly the same way, but in different rooms of the Hotel. To reveal them, go to the rightmost bed in the corresponding room, jump on it not less than 7 times in row (like on the couch in the lobby to get to the upper floor). When landing on the bed for the 7th time, hold Up, then press A + B. The item will fall from the upper-right corner of the screen. The names, the corresponding items and its locations are described in the table below. Note, that jumping may be tricky. But there is a way to do it for sure. Press and hold Up in mid-air every time you jump up. While you holding it, the jumping counter is not resetting, even when you land and stand still on the bed. To perform next jump, release Up for very short time, press A to jump and hold Up immediately again.

Name	\|	Location	\|	Item
Roddy Magic	\|	Hotel floor 11, Room 2	\|	High jump item (Bell)
David Magic	\|	Hotel floor 11, Room 4	\|	Simple invincibility item (Candy)
Nancy Magic	\|	Hotel floor 14, Room 2	\|	Super invincibility item (Bottle)

Hon Shougi

(GEN) Cart RAM clear (added 15.06.17):
During the game, open the main game's menu, put cursor to the second option (SAVE/LOAD), hold Select and press A. Select one of two slots to clear and press A again.

Hong Kong

(GEN) Title screen cheats (added 15.06.17):
At the title screen, hold one of the following button combinations and press Start to get the corresponding effect.

A	-	Sound test.
B	-	Stage complete animation.
A + B	-	Hong Kong Block mini-game. Beat 6 stages to see the true game ending.

Source: urawaza.in, gamefaqs.com

Hook

(FIX) Cheat mode (added 15.06.17):
At the title screen, press Right, Up, Up, Down, Down, Right, Left, Up. A sound will confirm correct code entry. There are several options available now. At the title screen, press Left to see the ending. At the Map screen, select location and press Select to skip to in instantly.
Source: gamefaqs.com

Hudson Hawk

(FIX) Title menu cheats (added 16.06.17):
At the title screen, when "PRESS START" message is displayed and when you can choose to ON or OFF the Music and SFX, before the demonstration begins, enter one of the following button sequences. If done right, the "CHEAT SCREEN" will be displayed. You can toggle the cheat mode ON and OFF and return back to the title screen. When cheat mode is ON, there are a couple of options available during the game, all described in the table below.

Up, Left, Down, Right, Right, Down, Left, Up	-	Infinite lives Press Select during the game to kill all enemies on the screen. Hold B, then press Select to skip current Level part. Hold B + Up, then press Select to instantly complete current Level. Also if mode is ON, the demo sequence will play incorrectly. Source: gamefaqs.com
Select, Select, Select, B, A, B, Start	-	All effects enabled by the previous cheat. Invincibility to all Enemies, its projectiles and deadly objects (including alarm floors). You still can die in the ground pits, but since the lives are infinite anyway, that's not a problem. Hold Select, then press Start to toggle the Level view mode using the D-Pad button. However, this doesn't mean you can put your character at any position of the level.

Hugo 2

(UNI) Secret message (added 21.06.17):
Complete the game on the "SCHWER" ("Hard") difficulty without losing any lives and with not less than 50 gold bags collected during the game (only the completed levels counts). Then after the Credits roll you'll see an addiotional dedication screen with name: "JANINE LEA".

(UNI) License screen cheats (added 21.06.17):
At the License screen, enter the button sequence A, B, Left, Down, Right, Up, A a number of times corresponding to the desired cheat described in the table below. Note, every time you complete one sequence, a sound will play. Worth to mention, that the cheat test code meant to have 3 different codes which you need to input one after another to enable the cheat with a corresponding number, but in the release version all three sequences are the same so you just need to repeat them.

1 Time	-	Infinite lives in all Stages
2 Times	-	In the Woods level, the Logs won't kill you anymore.
3 Times or more	-	Unused, does nothing.

(BUR) Game genie (added 21.06.17):

0+A‑71F‑E66

Use the codes, where "+" is the number from 0 to 2 to switch the game to a different languages (English, Portugese and French correspondingly). The game has default language hardwritten in the ROM - 3 (German). Most of the Language tables are points to the same German phrases, only the menu is fully translated (Portugese has a bug in it, however), as well as the intro phrase for all other languages is "GAME OVER".

Humans, The

(GEN) Sacrifice (added 22.06.17):
During the game, on any level, except levels 1, 7 and 21, press Select + Down to open the Sacrifice menu. You can exchange one or more humans to one of the tools instantly.

Hunchback of Notre Dame, The: Topsy Turvy Games

(GEN) Secret passwords (added 22.06.17):
This password is for the Chiseler game mode only. After entering this password, the game will return to the password entry screen without any indication.

PSCGM

Cheat mode. During the game, press A to increase amount of lives. Press Select to skip to the next stage.

Source: tcrf.net, gamefaqs.com

(FIX) Secret passwords (added 22.06.17):
There is a complete list of FunFair tickets. At some point during any of 5 mini-games you can unlock the Challenge mode for a corresponding game. Then the game will generate the Tickets which contains info about all unlocked Challenges. Upon entering the Ticket in a FunFair mode, the Wheel of Fortune will randomly select one of the unlocked games to play random Challenge. In the table below, "P" stands for "Picture Puzzle", "U" - "Upsy Daizy", "F" - "Catch the Fool", "D" - "Djali Bowling" and "C" - for "Chiseller", "+" means the corresponding game is unlocked in a particular Ticket.

Ticket

04419

Source: gamefaqs.com

75939

95567

76431

Source: gamefaqs.com

75407

55762

41403

59269

38793

44722

76792

54146

13258

10017

59657

41389

41858

19566

83203

25112

58415

34693

24872

41984

75478

30434

68066

67782

83840

39074

11320

Hunt for Red October, The

(GEN) Stage select (added 23.06.17):
At the title screen, press B, Select, Left, Right, Start.
Source: gamefaqs.com

(FIX) Course map cheats (added 23.06.17):
At the course map screen, hold A + B, then enter one of the following cheat sequences. They cannot be combined, so choose wisely.

Select, Up, Down-Extra 25 lives

Up, Down-Extra 25 missiles

Left, Right-Extra 25 cloaks

Source: gamefaqs.com

Hyper Lode Runner

(UNI) Password generator (added 23.06.17):

Ikari no Yousai 2

(GEN) Secret passwords (added 26.06.17):

"ANAI "	-	SD mode, girl head 1.
"MAI "	-	SD mode, girl head 2.
"BOSS2"	-	SD mode, girl head 3.
"VIVA!"	-	Girls dance screen, then Ending.

Source: gamefaqs.com

Incredible Crash Dummies, The

(GEN) Cheat mode (added 26.06.17):
At the title screen, press Up, Down, Left, Right to activate the cheat screen. Now enter any of these passwords from the table below.

57481235	-	Day 1
32054573	-	Day 2
29643724	-	Day 3
12715632	-	Day 4
58328765	-	Day 5
46875973	-	Easy difficulty
63442196	-	Normal difficulty
92347232	-	Hard difficulty
81212337	-	Very hard difficulty
56378152	-	Sound test

Source: tcrf.net, gamefaqs.com

Initial D Gaiden

(UNI) Unlock all (added 27.06.17):
Hold A + B + Select + Left + Down, then power up the console and wait until the title screen appears. This will unlock all 4 scenarios, 2 extra courses and 7 extra cars instantly.

Iron Man X-O Manowar in Heavy Metal

(FIX) Secret passwords (added 30.06.17):

LSLSDB

Enables the debugging features.
During the game, press Start to pause, hold either A or B then press Start again to enter the Stage select menu.
Either on pause or during the game, hold Left and press Start to toggle the Stage select cheat OFF and ON again. A sound will be heard instead of toggling the Pause mode.
During the game, hold B + Start then press Up or Down to free move your character vertically at current horizontal position. Also, if you hold the same buttons mid-air while dodging after the enemy bullet hit, you can do the same horizontally but only inside current screen. However, due to hacky controls programming method, if you press Up being in free horizontal movement state you switch to free vertical movement state and couldn't control the horizontal movements anymore, but still have a horizontal velocity. So you can free walk through the level somehow. Also, being in a free movement state you are completely invulnerable, as well you won't meet bosses anymore.

Source: gamefaqs.com

Ishidou: The Way of Stones

(UNI) Auto play (added 30.06.17):
At the title screen, setup any game mode and options, press Start then immediately hold A + B + Select + Start + Right for the Japanese version and A + B + Select + Right for the US version, then wait until the screen fades out.

Itchy & Scratchy: Miniature Golf Madness

(FIX) Title screen cheats (added 03.07.17):
At the title screen, enter one of the following cheats to get a corresponding effect. A sound will confirm correct code entry. Cheats may be combined.

Select, A, Down, B, Up, Down	-	Empty cheat, does nothing, only sound can be heard for it.
Right, A, Down, Right, A, Down	-	Invincibility.
Select, Up, Up, Select, Left, Left	-	Stage select.

Source: gamefaqs.com

Itsudemo! Nyan to Wonderful

(BUR) Hidden text (added 03.07.17):
The Cart RAM initialization routine uses following string at 0x39065 in ROM as a save data signature:

BUP MEMORY INITIALIZED V.14

Source: tcrf.net

J.League Fighting Soccer: The King of Ace Strikers

(GEN) Auto play (added 04.07.17):
At the "HALF" selection menu for the "TEST PLAY" mode or at the "CONTINUE/START" menu of either the "TOURNAMENT" or "LEAGUE" modes, hold Select + Start, then press A. Now, both players will be CPU controlled and play automatically.
Source: urawaza.in

(BUR) Hidden text (added 04.07.17):
The Cart RAM initialization routine in this game uses a programmer's nickname as RAM signature:

SILPHEED

Jack Nicklaus Golf

(UNI) Secret message (added 11.07.17):
At the title screen, wait for "A SCULPTURED SOFTWARE presents" window starts to scroll out, hold Start + Select + Left and wait for the license window appear. Continue holding all the buttons about 7 seconds after that until the series of the secret dedication messages are displayed.
Source: tcrf.net

James Bond 007

(GEN) Secret names (added 15.07.17):
Enter one of these words as a player name when registering a new Save game slot. All names are unlockable and given to you after the credits screen when the game is beaten.

BACCR	-	Baccara mini-game
BJACK	-	Blackjack mini-game
REDOG	-	Red Dog mini-game

Source: gamefaqs.com

(BUR) Game genie (added 15.07.17):

0C1‑85F‑C46+F91‑8CF‑5D+701‑8DF‑B3B

Re-places the title screen with an unused version screen "JAMES BOND 11:23:97A", most probably a leftover from the developement stage.

Jankenman

(FIX) Ending (added 01.09.18):
At the Stage select screen, hold Right + A then perss Start.
Source: urawaza.in

Jelly Boy

(UNI) Secret passwords (added 06.09.17):
Upon entering a secret password a message "CHEAT ACTIVATED" will be displayed, then program will wayt for any other password input, so secret passwords can be combined together or with any other valid password.

94737921889254	-	Extra 10 lives, extra 1 note at the beginning of the level.
SFVGHVRLHDKNLT	-	Extra 20 lives.
NDSGVBQXCDCPHG	-	Does nothing, rises an unused cheat flag.
CHVBDTHDFHLNMS	-	Unlocks all rooms.
KRC-FGBB809HRB	-	Enables the free walk in the level map mode.

Jetsons, The: Robot Panic

(BUR) Game genie (added 11.09.17):

00F‑50C‑C4D

Re-enables the invincibility toggle cheat. Any time during the game just press Select to either switch the invincibility on or off.

Jikuu Senki Mu

(BUR) Game genie (added 12.09.17):

50A‑E28‑E6B	-	Replaces ingame menu option "CHANGE" with the "DEBUG DATA SET" menu. It allows you to change any area or item flags as well as warp to any town. There should be a button code to enter this menu when you enter the "CHANGE" option (hold Start + A). But the corresponding branch instruction in the final version were removed, so button code doesn't work.
201‑7DA‑80E	-	Re-enables the Instant Flee button code. During the monster battles, hold Start + Select then choose "FLEE" option from the battle menu to skip any battle instantly.

Jinsei Game

(UNI) Same human-controlled players (added 14.09.17):
While selecting 2 or more human-controlled players, normally you cannot selected the same character for different players. But, you actually can do it if hold Select + B. This does not applied to the CPU controlled players.

(BUR) Game genie (added 15.09.17):

7C1‑EAF‑08E+081‑EBF‑B36	-	Re-enables the Debug menu activation code. During the game press Select to open the debug menu. Note, some portions of the game has no proper font loaded unless you at any message or menu screen.
292‑70F‑91B+5C2‑71F‑6EB+059‑46A‑F72	-	Re-enables unused game setup screen intended to be called after the name entry but before the game. This screen asks all players to choose a card and then decide the turns order. The code is fully working except the order isn't used by the game anyway. All players are moving according to it's numbers in the list. Note, that this hack is overwrites the ending screen.
25A‑9CB‑804+4CA‑9DB‑C46	-	Replaces the empty dummy handler for "SCROLL TEST" in Debug Menu with otherwise not mentioned anywhere else "SPRITE TEST". The test is rather simply just like the "CHR TEST", and only allows you to see one single sprite with some animation using currently loaded tiles for sprites.

Source: tcrf.net

Joe & Mac (USA), Joe & Mac: Caveman Ninja (Europe)

(BUR) Game genie (added 18.09.17):

047‑C99‑E62+047‑519‑E62 (for the US version)	-	Re-enables the language select and the music on/off options in the main game menu.
045‑DA9‑E66+046‑4C9‑E66 (for the European Version)	-	Re-enables missing music on/off option in the main game menu.

Joshua (Wisdom Tree, Unlicensed)

(UNI) Debug mode (added 18.11.18):
At the title screen, enter the Sound test mode. Put cursor to "JOSHUA HAS TO START OVER" option, press Left. Then, put cursor to "JOSHUA EXITS LEVEL" option and press Right. If done right, the "WON THE GAME" music teme starts to play automatically. From now, there are several options available.
At the title screen, press either Left or Right at least once to activate a debug CPU-meter during the game. It will be displayed instead of current stage number in the game's HUD.
At the Stage number screen:
Press Start to increase lives.
Press Select to get extra 100 Trumpets and set weapon to max power and range.
Also level selection with Up/Down skips stage by 1 instead of 5. Max level value increased from 81 to 110 which includes all 100 game levels as well as 10 bonus levels.

(UNI) Secret passwords (added 18.11.18):

ADAM	-	Enter this password then press Select + B instead of A. This enables the same Debug mode described above but you just can't activate the CPU-meter from here.
FQUE	-	Bonus level 1. Note, this and all following passwords are not available during the game even using the Debug mode cheat to select them manually at the Stage number screen.
CJEU	-	Bonus level 2
JTJS	-	Bonus level 3
XJKC	-	Bonus level 4
AGSB	-	Bonus level 5
JMMP	-	Bonus level 6
GZZW	-	Bonus level 7
BLPK	-	Bonus level 8
YQEH	-	Bonus level 9
HPNJ	-	Bonus level 10

Joust (Arcade Classic No. 4)

(UNI) Skip to hi-score (added 29.06.16):
At the title screen, press Left + Select to skip to the hi-score display immediately without need to wait.

Judge Dredd

(GEN) Stage select (added 18.09.17):
At the title screen, press A, Left, Right, Left, Right, B. A sound confirm correct code entry. The Stage select screen will appears before the new game starts.
Source: gamefaqs.com

Jurassic Park

(GEN) Stage skip (added 21.09.17):
At the main game menu, press Up, Down, Left, Up, Down, Right, Select, Up, Down, Left, Up, Down, Right, Select. A sound will confirm correct code entry. During the game, either hold Select and press Start, or press Start, then press Select once (in this case sometimes code doesn't work) to skip to the next level.
Source: gamefaqs.com

Jurassic Park 2: The Chaos Continues

(GEN) Stage skip (added 23.09.17):
Pause the game, press Up, Down, Left, Right, A, B, Up, Down, Left, Right, A, B. A sound will confirm correct code entry. Being in pause mode, hold Select, then press Start to skip to the next Stage.
Source: gamefaqs.com

(BUR) Hidden text (added 22.09.17):
There is a build date string and the very beginning of the ROM:

 28 SEPTEMBER 1994

(BUR) Game genie (added 23.09.17):

001‑66C‑80A+001‑67C‑B36	-	Re-enables some weird debug leftover. Enable the Stage skip cheat as described above, then press A + B + Select to reset the game with some weird screen effect.
001‑9DC‑C4D	-	Also for the Stage skip cheat re-enables additionally a Hearts restore button code. Hold A, then press Start to refill hearts.

Kachiuma Yosou Keiba Kizoku (Japan), Kachiuma Yosou Keiba Kizoku Ex'94 (Japan Rerelease), Kachiuma Yosou Keiba Kizoku Ex'95 (Japan Rerelease)

(GEN) Credits (added 25.09.17):
For the regular version of this game, at the title screen, hold B + Select + Up and press A. For the "EX" versions, you need to hold A + B + Select + Up at once at the "KING" logo then wait until the screen fades out.
Source: urawaza.in

(GEN) Cart RAM clear (added 25.09.17):
For the regular version, when "BACKUP RAM CHECK" is displayed, press Select to erase all saved data instantly. For the "EX" versions, on the powered off console, hold Select + Start, then power it on.

Kaeru no Tame ni Kane wa Naru

(GEN) Cart RAM clear (added 25.09.17):
At the title screen menu, press Down + Right + B to clear the saves data.

Kaguya Hime Pachinko

(UNI) Ingame cheats (added 25.09.17):
Enter any pachinko machine game, press Start then enter any of the sequences below. A sound will confirm correct code entry. Every codes toggles a corresponding cheat flags on an off. You can enable more than one at once. Some of cheats does nothing because they are disabled in code, however it is possible to re-enable them via Game genie codes (see section below). Very similar cheats may be found in many other Pachinko games by COCONUTS.

Start, Up, Up, Down, Down, Right, Left, Right, Left, Up, Up, Down, Down, Right, Left, Right, Left, Start	-	(0) Instantly enables the "RAKU RAKU PACHIN" item during the game which normally should be bought in the items shop. Press A to stop the balls. Lever is stand still. Effect is permanent for all machines and can be disabled only by using the corresponding item of after the game over screen.
Start, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, Start	-	(1) Instantly starts the "Jackpot" state for current machine.
Start, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Start	-	(2) Displays current lever position at the bottom-right corner. Also disables screen flashing when sink the ball into the hole. Effect is permanent for all machines.
Start, Left, Down, Left, Left, Left, Down, Left, Left, Start	-	(3) Does nothing.
Start, A, A, A, A, A, B, B, B, B, B, A, A, A, A, A, B, B, B, B, B, Start	-	(4) Does nothing.
Start, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, Start	-	(5) Enables adjusting machine speed. Press Up/Down do adjust the speed. Press A to set maximum speed (0). Press B to reset to the defaul machine speed. Effect is permanent for all machines.
Start, Up, Right, Up, Right, A, B, A, B, Up, Right, Up, Right, A, B, A, B, Start	-	(6) At the machine info/start menu, press Start to select any machine type or hold Select and press A to instatnly beat selected pachinko machine. Also disables random pachinko machines difficulty tossing upon starting a new game after the game over screen. Effect is permanent.
Start, B, B, Right, Left, B, B, Right, Left, Start	-	(7) Does nothing.

(BUR) Game genie (added 26.09.17):
Note, each pair of codes here are replaces the same 6th cheat handler with one of the disabled handlers. So you won't be able to use Speed adjust cheat here and can't re-enable all cheats at the same time.

DF5‑8B8‑08E+765‑8C8‑3B7	-	Restores the 4th cheat handler. This was some kind of Timer mini-game, unfortunately it seems unfinished and does not work properly. When triggered, both the machine and the player gives 2000 balls instantly and a current stage number and a timer are displayed at the bottom-right corner (timer interrupt should be used but never enabled in the current code so timer doesn't increment at all). The game will play intil some predefined timer value then stop and check the results.
E85‑8B8‑08E+755‑8C8‑3B7	-	Restores the 5th cheat handler. This allows you to adjusted several machine probability values, mostly used for calculating a chance to ball to sink into the particular hole. Use D-Pad to set any of 7 values from 01 to 99. Press Start to return back to the game.
805‑8B8‑08E+765‑8C8‑3B7	-	Restores the 8th cheat handler. It were used for adjusting the timer stop value for the Timer mini-game mentioned above. Use D-Pad then press Start to apply settings.

Kaijuu Ou Godzilla

(GEN) Sound test (added 02.06.17):
At the first title screen, press Select.

(UNI) Debug screen (added 02.06.17):
During the game, press Start to pause it, then press Up, Down, Up, Down, A, B, Right, Left, B, A, Down and additionally any button one more time. Here you can change the stage number, lives of the godzilla and more. Press B to exit back to the game. Press Select during the game to open Debug screen instantly.

Kamen Rider SD: Hashire! Mighty Riders

(BUR) Game genie (added 06.08.18):

358‑CAE‑4CE+288‑CBE‑91E+04B‑8CE‑E6E

There is an unused debug menu tile-map resource. However, there is no CHR data and proper code handler for this menu at all in the ROM. Also there is some kind of stage selection routine which even can display a number on the screen but have no proper caller and other corresponding code so in fact it is non functional. However, combining both leftovers we could see somehow the menu and the selection screen at once. So use three codes and enter the first option at the title screen. Since there is no proper font for menu letters, you actually can only see the options positions and a number at the bottom which correspond to stage select routine. The actual menu should look likie this:

     SD RIDERS


      1P START
      2P START
      2P FRAME TEST
      2P RANDOM TEST

Kandume Monsters

(UNI) Message test (added 26.09.17):
At the title screen, press Select, Left, Right, B, B, Down, Up, Select, B, Up. A sound will confirm correct code entry. 4th menu option will be added to the left of the main menu options. Select it to access the message test mode.

(UNI) SGB 2P battle (added 26.09.17):
This cheat is accessible only in SGB mode. First, enter the Message test cheat. Then leave the title screen (select "OPTIONS") and return back (this should reset the internal cheat counters). Now enter Select, Select, Select. A sound will confirm correct code entry. 5th menu option will be added to the right of the main menu. Select it to play 2P Battle mode on SGB controllers.

(UNI) Game genie (added 26.09.17):

226‑83F‑6E9+636‑84F‑5DB

Replaces ingame "HELP 1" screen with an unused disabled Parameters editor. You'll be able to modify any monster parameter and play again.

Karakuri Kengou Den Musashi Lord

(BUR) Game genie (added 03.10.17):

011‑8BF‑E6A

Enables the Debug features.
At the title screen:
Put cursor to "START" option, press Up to select starting stage.
Press Select to cycle through the SE/BGM indexes, press B to play it.
During the game:
On pause, every A press increments HP and adds 10 money.
At items menu, press Left 4 times, exit menu to toggle the Free Walk. Also you will be invulnerable for all enemies and obstacles except water.

Source: tcrf.net

Karamuchou no Daijiken

(UNI) Cheat menu (added 03.10.17):
At the title screen, press Select, Up, Down, B, Left, Start. You'll be able listen to the sounds and music, watch cutscenes including ending and staff roll, set invincibility or select any stage. The "PAUSE" option enables the pause button code: during the game hold Select then press Start, press Select to unpause.

Kaseki Sousei Reborn

(UNI) Cheat menu (added 04.10.17):
At the title screen, press Select, Up, Down, B, Left, Start. You can listen to the sounds and music, watch staff of intro sequences, or enable the Pause mode button code (during the game hold Select, press Start, press Select to unpause).

(UNI) Secret names (added 04.10.17):
Enter one of these words as a character name at the name entry screen to switch its current gender. By default it's male. Unfortunately, you couldn't switch genders for your dino-pets.

おとこのこ	-	Male character.
おんなのこ	-	Female character.

Kattobi Road

(GEN) Cart RAM clear (added 04.10.17):
Hold A + B + Up, then power on the console.

(BUR) Hidden text (added 04.10.17):
The Cart RAM initialization routine uses as a signature build date string:

IDY 5/27 14:10

Also, there is another completely unused date string inside the ROM:

1993,07,14,15,12

Kenyuu Densetsu Yaiba

(GEN) Continue (added 06.08.18):
At the title screen, press Left, Right, Down, Down, Left, Left, Up, Up, Start.
Source: urawaza.in

(GEN) HP recovery (added 06.08.18):
Pause the game, press Left, Left, Right, Up, Left, Right, Up, Down, then unpause it.
Source: urawaza.in, gamefaqs.com

Kid Dracula (USA), Akumajou Special: Boku Dracula-kun (Japan)

US version:

(FIX) Secret passwords (added 30.04.16):

7314	-	Sound test
9814	-	Mid-level minigames.

Source: gamefaqs.com

Japanese version:

(FIX) Secret passwords (added 30.04.16):

まつたけ	-	Sound test
ふりかけ	-	Mid-level minigames.

Source: tcrf.net

Kid Icarus: Of Myths and Monsters

(GEN) Cart RAM clear (added 30.06.18):
At the title screen, press Select + B + Left.
Source: gamefaqs.com

(GEN) Black Market Gamble (added 01.07.18):
During the game, at the Black Market Store, press A + B + Left + Down to throw the dice. If you lucky enough, the prices will lower down, if you don't they be risen twice.
Source: gamefaqs.com

(BUR) Hidden text (added 30.06.18):
The Cart RAM signature in this game is word:

KUMI

(BUR) Game genie (added 06.08.18):

010‑03F‑E6A

Re-enables some debug functionality.
During the game, hold Select then press Up to advance to the next stage up to 3-4, or press Down to return back to the previous stage.
While in pause mode, press either A or B to enable simple CHR viewer, press any of these buttons one more time to swap tiles, then once again to return back to pause screen.
At the status menu, now two rows of numbers are displayed under the strength meter, they are the special secret score and the current level score. Also, hold one of the buttons from table below, then press A to get a corresponding effect:

Up	-	Toggles three sacret treasures from Stage 4.
Down	-	Toggles NMI sync disable flag. When on, the game does not wait the NMI at the beginning of the main loop. Makes game faster somehow, but only when the main loop is not loaded enough.
Left	-	Toggles invincibility.
Right	-	Maximizes all player's statuses, gives all items and full map.

Source: tcrf.net

Kidou Keisatsu Patlabor (Mobile Police Patlabor) in Nerawareta Machi 1990

(GEN) Easter egg (added 09.08.18):
At the license screen hold A + B + Select + Start and wait for the title screen. Instead a screen filled with word "BABEL" will appear.
Source: urawaza.in

(GEN) Secret staff roll (added 09.08.18):
At the license screen hold Select and wait for the title screen. The secondary title will change to "あめりかへん　１９９４" ("America Hen 1994"). Now, press Start to watch the Secret staff roll.
Source: urawaza.in, gamefaqs.com

(UNI) Sound test (added 09.08.18):
There is a set of secret passwords with common format: "XX999", where "XX" a decimal number in range from "00" to "10". Upon entering any of it the backround music will change to a corresponding game track.

Kikou Keisatsu Metal Jack

(BUR) Game genie (added 17.01.17):

386‑C5E‑2AA

There is an error handler hidden in a couple of GB/GBC games by the same developer ("Chiki Chiki Tengoku", "Cyber Formula GPX" and many GBC titles). All them are functional, but can't be seen if no errors are happens. Most of that games has its font loading routine removed so you can't see something anyway. Surprisingly, this one particular game has the fonts and its loader intact so you may see this error handlers somehow. Use this code, thep press Start at the title screen.

Killer Instinct

(GEN) Auto player select (added 08.08.18):
At the player selection screen hold Up, then press any of these buttons: A/B/Select/Start. The current player will be selected randomly.
Source: gamefaqs.com

(GEN) Play as Eyedol (added 08.08.18):
At the versus screen, hold Right, then press Select, Start, B, A. A sound will confirm correct code entry. To keep playing this character you must enter this code before every fight. Also this is an unlockable cheat. It will be displayed if you beat the game on V.HIGH difficulty using less than 6 continues during the game.
Source: gamefaqs.com

(UNI) Arena select (added 08.08.18):
This cheat works only for 2-players mode only (either via game link or in SGB mode). At the versus screen, hold Up or Down and press one of the control buttons to play a particular arena rather than assigned to the opponent. Full list of combinations in the table below. Note, the Eyedol arena inaccessible with this cheat. Also note, the Secret Arena is a special hidden arena for 2-player mode only and can be accessed only via this cheat.

Hold	\|	Press	\|	Arena
Down	\|	A	\|	Arena Orchid
Down	\|	B	\|	Arena Jago
Down	\|	Select	\|	Arena Combo
Down	\|	Start	\|	Arena Fulgore
Up	\|	A	\|	Arena Glacius
Up	\|	B	\|	Arena Sabrewulf
Up	\|	Select	\|	Arena Thunder
Up	\|	Start	\|	Arena Spinal
Up + Left	\|	Select	\|	Secret Arena

King of Fighters '95, The (USA), Nettou The King of Fighters '95 (Japan)

(GEN) Frame advance mode (added 10.08.18):
Pause the game with Start, then press Select to advance the game frame by frame. To return to normal game preaa Start again.
Source: gamefaqs.com

(FIX) DIP switches (added 10.08.18):
There are a set of internal game flags called "DIP SW(itches)". Each flag, when set, enable one of corresponding features. To set any of these flags, at "TAKARA" logo enter particular button combination from the table below to get a corresponding effect. Every time one of the flags set, the corresponding sound will be heard. Note, some of features available only in Super Game Boy mode. To see what DIP switches are enabled, go to options screen. At the bottom of the screen there will be string "DIPSW-XX", where XX is a hexadecimal sum of all enabled DIP switch bits.

SGB only	\|	Code	\|	DIP SW	\|	Effect
No	\|	Hold A + B, press Select 1 time.	\|	bit 5 (HEX 20)	\|	Allow to select all the same characters in the "TEAM" game mode for one team.
No	\|	Press Select 3 times.	\|	bit 6 (HEX 40)	\|	Unlocks Saisyu and Rugal extra characters. Also these characters may be unlocked if you complete the game on "NORMAL" mode.
No	\|	Press Select 20 times.	\|	bit 7 (HEX 80)	\|	Unlocks Nakoruru extra character. Also this character may be unlocked if you beat the game on "HARD" mode.
Yes	\|	Press Select 25 times.	\|	bit 3 (HEX 08)	\|	Activates infinite "MAXIMUM" gauge meter for both players.
Yes	\|	Hold A + B + Left, press Select 30 times.	\|	bits 2,4 (HEX 14)	\|	Enables the SGB Sound test mode at options menu. Also enables two special move shortcuts. During the game, press either Select + B or Select + A to perform one of two most powerful moves for a corresponding character.

Note, that because of specific of the code input and check method, all button presses counted at the same time, so if you entering one of the codes, you already entering all others. So if you just quickly press Select at least 25 times at least three codes enables at once. To unlock all flags at once, first, hold A + B, press Select once, while still holding those buttons, hold additionally Left, then press Select very quickly 30 times. When you hear a final explosion sound means all codes are activated.
Source: gamefaqs.com

(UNI) Auto play (added 10.08.18):
At the "GAME SELECT" menu, chose any option, then hold B and press A. As the "PLAYER SELECT" screen now you may select CPU controlled fighter for your side. Note, this does not mean your CPU controlled fighter will WIN all the time.

King of Fighters, The: Heat of Battle (Europe), Nettou The King of Fighters '96 (Japan), Nettou The King of Fighters '97 (Pirate), King of Fighters '98, The (Pirate)

(GEN) Frame advance mode (added 11.08.18):
Pause the game with Start, then press Select to advance the game frame by frame. To return to normal game preaa Start again.
Source: gamefaqs.com

(FIX) DIP switches (added 10.08.18):
Since this game shares mostly the same engine with King of Fighters '95, the same "DIP SW" flags are accessible here also. All coding and behaviours mostly the same except some different effects described in the table below. Also as against the previous version, this one allows to enter all cheats no matter if they may work in SGB mode only.

Code	\|	DIP SW	\|	Effect
Hold A + B, press Select 1 time.	\|	bits 5,3 (HEX 28)	\|	Allow to select all the same characters in the "TEAM" game mode for one team. Also changes the POW GAUGE meter behaviour. Now it will constantly increase during the fight, no matter if you get hit or not. Also in will increase faster in some special cases.
Press Select 3 times.	\|	bit 6 (HEX 40)	\|	Unlocks Goenitz extra character. This code is unlockable and given to you if you beat the game on "NORMAL" mode.
Press Select 20 times.	\|	bit 7 (HEX 80)	\|	Unlocks Mr.Karate extra character. Also this enables a different characters selection for Iori, Leona and Chizuru. During player selection, press Start on these characters to change them to Iori', Leona' and Kugara correspondingly. This code is unlockable and given to you if you beat the game on "HARD" mode. Additionally this changes the default SGB border to a little bit different one.
Hold A + B + Left, press Select 30 times.	\|	bits 2,4 (HEX 14)	\|	If you run this game in SGB mode it will enable the SGB Sound test at options menu. In all other modes this enables two special move shortcuts. During the game, press either Select + B or Select + A to perform one of two most powerful moves for a corresponding character.

Note, all codes may be activated at once the same way as for King of Fighters '95, see above.Source: gamefaqs.com

(UNI) Auto play (added 10.08.18):
At the "GAME SELECT" menu, chose any option, then hold B and press A. As the "PLAYER SELECT" screen now you may select CPU controlled fighter for your side. Note, this does not mean your CPU controlled fighter will WIN all the time. This cheat not available in the Game Boy Link mode, but can be used in the SGB mode.

Kingyo Chuuihou!: Wapiko no Wakuwaku Stamp Rally!

(BUR) Game genie (added 13.08.18):

001‑7CE‑C4D

Re-enables debug leftover. Press Start any time during the game to cycle through entire set of screens, mini-games and other game routines.

Kinin Koumaroku Oni

(BUR) Hidden text (added 13.08.18):
The WRAM initialization routine uses as a signature word:

WINKY

Kirby's Block Ball (USA), Kirby no Block Ball (Japan)

(BUR) Game genie (added 14.08.18):

512‑8FE‑C43 (for the US version)
512‑6EE‑C43 (for the Japanese version)

Enables the access to Debug menu via Soft reset code (A + B + Select + Start) any time during the game. Debug menu allows you to start to play from any regular or boss stages, play all bonus games on any difficulty level, watch various game animations and all endings.

Source: tcrf.net

Kirby's Dream Land (USA), Hoshi no Kirby (Japan)

(GEN) Title screen cheats (added 14.08.18):
At the title screen, press one of the following button combinations at the same time to get the corresponding effect.

Down + Select + B	-	Configuration screen and Sound test.
Up + Select + A	-	"Extra game". Harder game mode with different sets of graphics for enemies.

Kirby's Pinball Land (USA), Kirby no Pinball (Japan)

(GEN) Ranking clear (added 15.08.18):
At the Ranking screen, press Down + Select + Start at the same time.
Source: urawaza.in

(FIX) Title screen cheats (added 15.08.18):
At the title screen, hold Select along with one of the buttons described below and press either A or B to get a corresponding effect. If done right, the title screen switches to a Ranking screen and a small cat character will walk on the floor. Now return to the title screen with A or B and start a new game.

Button	\|	A Cat	\|	Effect
Left	\|	A white cat walk right to left.	\|	Bonus games only mode.
Right	\|	A black cat walk left to right.	\|	Boss games only mode.

Source: gamefaqs.com

Kirby's Star Stacker (USA), Kirby no Kirakira Kids (Japan)

(GEN) Sound test and mini-games (added 15.08.18):
The extra options are unlocked after completing the game to 100%. Just go to the game loading screen and select your 100% save file. You may choose now to play two bonus mini-games or access the Sound test.
Source: gamefaqs.com

Kitchen Panic

(UNI) Stage select (added 15.08.18):
At the title screen, hold Down + Left, then press Start.

(BUR) Hidden text (added 15.08.18):
There is a hidden copyrights at the beginning of the ROM:

1991-2-22

and

programmed by Motos.Kanayama

Source: tcrf.net

Kiteretsu Daihyakka: Bouken Ooedo Juraki

(FIX) Title screen cheats (added 16.08.18):
All cheats entered at the title screen. Only one cheat may be entered at once. For three credits screen cheats the final Select button need to be pressed and then held for a couple of seconds until cheat is triggered.

Up, Down	-	No cutscenes.
Left, Left, Right, Right, Up, Down, A, B	-	Stage select. Source: makainyumon.web.fc2.com
Left, Left, Right, Right, Up, Down, A, A	-	Invincibility. Source: makainyumon.web.fc2.com
Left, Left, Right, Right, Up, Down, A, A, B	-	Stage select and Invincibility. Source: makainyumon.web.fc2.com
Up, Left, Down, Right, Up, Left, Down, Right, B, A	-	Sound test. Source: makainyumon.web.fc2.com
B, B, B, B, B, A, B, B, B, B, B, Select	-	Director credits screen. Source: makainyumon.web.fc2.com
A, A, A, A, A, B, A, A, A, A, A, Select	-	Character designed credits screen. Source: makainyumon.web.fc2.com
A, B, Right, Left, Right, Left, Down, Down, Up, Up, Select	-	Programmer credits screen. Source: makainyumon.web.fc2.com
Up, Right, Down, Left	-	Mini games test.
A, B, B, A	-	Cutscenes viewer.

Kizuchi da Quiz da Gen-san da!

(BUR) Game genie (added 18.10.17):

992‑979‑B31

Re-enables the location skip at the Map screen. Press either A, B or Select to skip to the next location. Press Start to play at current location.

Klax (Japan, Hudson Soft)

(GEN) Debug leftover (added 16.08.18):
Any time during the game, press Select to instantly obtain a specific block on the paddle. It seems this is a debug leftover that developers forgot to remove.
Source: gamefaqs.com

(UNI) Any Wave select (added 16.08.18):
At the Wave select screen, press Up, Up, Down, Down, Up, Down, Up, Down, Up, Up, Down, Down. The screen changes to a new Wave select mode where you may select any wave from 001 to 100.

Koi Wa Kakehiki

(GEN) Special start stage (added 16.08.18):
At the title screen, press Down, Up, Right, Left, B. In case you beat this very hard stage the message "LOVE AND PEACE" will appear.
Source: urawaza.in

Koro Dice

(FIX) Secret passwords (added 17.08.18):
Start a new game, choose mode and any level above 3 to be able to input password. Input one of the following passwords to get a corresponding effect.

49551	-	Sound test. Source: gamefaqs.com
61283	-	1P lvl 10 cutscene
19792	-	1P lvl 20 cutscene
25761	-	1P lvl 30 cutscene
67373	-	1P lvl 40 cutscene
19923	-	1P final cutscene
97374	-	VS win 1
39672	-	VS defeat 1
66422	-	VS win 2
33011	-	VS defeat 2

Kung-Fu Master (USA), Spartan X (Japan)

All versions:

(FIX) Hidden text (added 18.08.18):
The RAM initialization routine uses this word as a signature at RAM location $FF9E:

HIRO

Japanese version:

(FIX) Sound test (added 07.01.17):
At the difficulty selection screen, hold B, then press A.
Source: urawaza.in, tcrf.net

(UNI) Stage select (added 07.01.17):
At the difficulty selection screen, hold Left, then press A 5 times, release Left, then hold Right and press B 3 times, release Right.

Kuusou Kagaku Sekai Gulliver Boy: Kuusou Kagaku Puzzle Purittopon!!

(FIX) Stage select (added 19.08.18):
At the title screen, hold Up, then press A 12 times. A sound will confirm correct code entry. For Story mode, pause the game, press Select to cycle between levels 01 to 14, unpause it to just right to this level. Also, on pause press Down + A + B at the same time, then unpause to instantly complete current stage. For Puzzle mode, the only Stage select code works the same way, but levels from 01 to 50 are available.
Source: urawaza.in

Kwirk (USA, Europe), Puzzle Boy (Japan)

(UNI) Linear course (added 10.05.16):
In the "Heading out" mode, the room course is random and rooms selection depends only on the skill level. But, if at the "Select display" screen you hold Left + Select before startin a game, the course will be always the same with linear room arrangement, but you can't select a number of rooms to play, it is fixed too and depends also on the skill level only.

Lamborghini American Challenge

(UNI) All stages and 999999 money (added 20.08.18):
There are no secret passwords in a usual manner in this game. So no specific sequences of letters to input as a passwords here. However, go to the password screen, put cursor to the rightmost letter and set it to "F", then hold Select + B and press Up. Instead of wrapping back to "0" the letter increased past "F", to "G". Release all buttons. Now pressing Up increases this letter up to "Z". Set it to "X" and press either A or B. Such "password" accepted with a specific sound, and game started with all stages unlocked and with $999999 money.

Lawnmower Man, The (Europe), Virtual Wars (Japan)

(UNI) Easter egg (added 20.08.18):
Wait at the title screen until the animation sequences begins. At the second animation sequence with "LAWNMOWER" zooming out, hold A + B + Up. While holding these buttons press Left/Right to manually zoom the message. To return back to normal animation, just release all the buttons.

(UNI) Cheat menu (added 20.08.18):
Before powering the console, hold A + Right. Power up the console, when license screen appears release these buttons and hold B + Left, then press Start or just wait for the intro begins. Wait for intro is over or just skip it. If all done correctly, the "(c)" symbol in "(c)1993" string at the title screen turns into black smiling symbol. Now, hold A + B + Down and press Start. The menu with version number/date and header "BLUE MEANIE MODE!" will appear. This menu allows you to play any game level including vitual worlds, also disable virtual words or enable infinite lives.

(BUR) Hidden text (added 20.08.18):
There is a hidden copyright and version/date text at the very beginning of the ROM. For the Japanese version text is:

THE LAWNMOWER MAN JAP v1.90 01/11/93 BY KEN MURFITT.

For the European version:

THE LAWNMOWER MAN EUR v1.95 11/11/93 BY KEN MURFITT.

Source: tcrf.net

Legend of the River King GB (USA, Europe), Kawa no Nushi Tsuri 3 (Japan)

(BUR) Game genie (added 16.10.17):

003‑55E‑7F6 (for the US version) 003‑32E‑7F6 (for the Japanese version)	-	Re-enables the Debug menu activation code. Any time during the game hold A + B and press Select. In the US version they swapped Select and Start for in-game mode. This changes the Debug menu activation code in this mode as well, you need to press Start instead of Select. Although the US version version has all the same debugging functions working, there is no proper font loaded as well as the text resources are lost during translation. The debug mode allows you to jump directly to any system game handlers or sub-handlers (where debug has index $07), also setup the map index, current location, strength, money and experience. Two "DUMMY" and one "DEBUG" parameters aren't used in the release version.
001‑DCA‑C4D (for the US version) 001‑C2A‑C4D (for the Japanese version)	-	In the release version, you can see the float as a small object in the river only. With this code enabled, there is a closeup picture of the float will be displayed. However, the catch animation resourses are unused here so seems they removed it on early stage. Since the closeup picture is a sprite it interferes with other sprites and can make fish or float invisible or overlapped with it.

Legend of Zelda, The: Link's Awakening (USA, Europe), Zelda no Densetsu: Yume o Miru Shima (Japan)

(GEN) Secret names (added 12.03.18):
Enter one of these words as a Player's name at the beginning of a new game to hear the different background music on the Save selection screen. Different game versions uses a different words and a different set of music.

ぜるだ (for the Japanese version) ZELDA (for the Western versions)	-	Title screen remix.
とたけけ (for the Japanese version only)	-	Totaka's song.
MOYSE (for the German version only)	-	Moyse's song.
LOLO (for the French version only)	-	"Lolo" song.

Source: tcrf.net

(BUR) Game genie (added 12.03.18):

010‑03F‑E6A	-	Re-enables first portion of debug leftovers sitting in the game. When enabled there are several featurea available during the game: At the game boot, slot 1 save will be overwritten with precomposed save state with name ZELDA and maxed out parameters, as well as unlocked all grotto levels. Any time during the game, hold any D-Pad button then press Select to hold the game. Press Select to unhold the game. Also every time you exit the hold state, a Free Walk mode toggles on and off. At the map screen, press Select + B to warp in the center of currently highlighted area. This also disables the ability to exith the Map screen with B. When Player's name starting with 1 zero character (which normally impossible), the Marin object turns to Message debug object. Use D-Pad to change current index, press A to see bank 0 messages, and B or Select to see bank 1 and 2 messages respectively.When Player's name starting with 2 zero characters, the Marin object will immediately start the Ending sequence. Source: tcrf.net
010‑04F‑E6A	-	Re-enables the second portion of debugging features. For some debugging reasons, this flag disables a couple of redrawing routines. The different regional versions has a different sets of disabled routines. For example, there are no items redraw on the items screen (as well as equipped items) and entry arrows on the mini-map in the US version. The main feature for this flag is ability to control the Ending sequence. Press Left/Right to skip to the next scene, press Down/Up to start the Ending sequence from the beginning. Source: tcrf.net
282‑B5A‑80A (for all versions)	-	Re-enables an additional debug leftover, not using the debug flags mentioned above. Any time during the game, hold B then press Select to warp instantly to grotto level at some fixed position. Also draws a full map of the grotto but without chests. There are 11 hard coded locations in a table associated with this debug leftover. After 11th location code wraps back to the first one. Note, this feature uses the same button combination as map warping feature so both debug features can't be used at the same time.

Lemmings

(BUR) Game genie (added 22.08.18):

CDA‑97E‑919 (for the US version)
CDA‑92E‑919 (for the Japanese version)
CDA‑83E‑919 (for the European version)

Demonstrates how the debug assert routine looks like in this game. The program still performs some assertion checks to show this but obviously all code well debugged and never goes to this crash handler.

Source: tcrf.net

(BUR) Hidden text (added 22.08.18):
There is a hidden text line in ROM used to mark the end of the program part of the game. All data after first entry of this line is a garbage (may even contain this line itself):

THE END IS NEAR

Lemmings 2: The Tribes

(BUR) Hidden text (added 22.08.18):
There is a hidden copyright scring at the beginning of the ROM:

Copyright SPIDERSOFT 1994

Source: tcrf.net

Les Aventures De TinTin: Le Temple du Soleil (Tintin: Prisoners of the Sun)

(UNI) Sound test (added 22.08.18):
At the title screen, put cursor to "START" option, hold Up and press A or Start.

(UNI) License screen cheats (added 22.08.18):
At the license screen, enter one of the following cheats to get the corresponding effects. Note, sequences may be entered only in a particular order. You cannot input sequence 2 first, only after sequence 1 and so on. Every time sequence succesfully entered a sound will be heard.

Sequence 1: B, A, Up, Down, Right, Down, A	-	During pause, press Select to advance the game frame by frame. Press A + B to enter the Stage select mode. Note, you can jump only to a beginning of every level. Sublevels are not available in this Stage select.
Sequence 2: Up, Down, A, B, Down	-	Additionally enables invincibility and infinite lives for places where invincibility does not work.
Sequence 3: B 28 times, then A.	-	Although this cheat may be entered, it seems does nothing. Can't see any code that check for this third cheat, but maybe they used some optimized code portions with partial offsets, need to investigate more then.

(BUR) Hidden text (added 22.08.18):
There are few leftover text in the sound engine bank. First is the single source line for some portion of the sound engine obviously with comment in spanish:

	JR	Z,$SOLO1	; Solo necesita la primera envol

The second string is a end of data/code mark for the sound engine. All bytes past this string is an unused space.

Final de la rutina de musica

Source: tcrf.net

Lethal Weapon

(GEN) Cheat mode (added 23.08.18):
At the title screen, press Down, Up, Left, Left, Up, Right. A sound and a message "CHEAT MODE" confirms correct code entry. This gives you infinite health and ammo.
Source: gamefaqs.com

(BUR) Hidden text (added 23.08.18):
There is a hidden copyright string at the beginning of ROM:

PROGRAMMED BY TIM COUPE (C) 1992 EUROCOM DEVELOPMENTS

Also, worth nothing, but the random generator initialized in this game with string:

TIM!

Source: tcrf.net

Lion King, The

(GEN) Pause cheats (added 23.08.18):
Pause the game with Select then enter one of these cheats.

B, A, A, B, A, A	-	Stage skip.
B, A, A, Left	-	Suicide.

Source: gamefaqs.com

(BUR) Hidden text (added 23.08.18):
There is a hidden bible quotation inside the ROM similar to text used in the NES version of the same game by the same developer:

Suffer little children to come unto me

Little Indian (An Indian in the City, Un Indien Dans La Ville)

(GEN) Stage skip (added 24.08.18):
During the game, pause it with Start, then press Right, Right, Right, Right, Down, Down, Down, Left, Left, Up. A sound confirm correct code entry. Now any time on pause, press Select to skip current stage. However, after the last stage this code will wrap back to the very first stage.
Source: gamefaqs.com

Little Master 2: Raikou no Kishi

(GEN) Secret world menu (added 25.08.18):
In order to access this menu you must complete game for the first time. Return to the title screen and at "PRESS START" message enter Up, Up, Down, Down, Left, Right, Left, Right. An additional menu option "ひみつのせかい　いりぐち" ("Entrance to Secret World") will appear above the "PUSH START" message. Now press one of the buttons described in table below to get a corresponding effect.

A	-	Sound test.
B	-	Battle backgrounds test.
Select	-	Ending characters presentation.
Start	-	Enemy test.
Down	-	Story cutscene animation 1.
Up	-	Story cutscene animation 2.
Left	-	Ending cutscene animation.
Right	-	Return to the title screen.

Source: urawaza.in

Little Mermaid, The

(UNI) Invincibility (added 27.08.18):
Hold A + B + Select before powering the console on. If done right, Mermaid turns completely invulnerable.

Lock 'N Chase

(GEN) Title screen cheats (added 27.08.18):
At the title screen, when "START" is displayed, enter one of the following sequences to get a corresponding effect.

A, A, B, B, A, B, B	-	Extra stages. This code is unlockable and given to you after beating first 18 stages.
A, B, Up, Up, Down, Down, A	-	Start on Stage 2-1.
A, B, Right, Right, Left, Left, A	-	Start on Stage 3-1.
A, B, Down, Down, Up, Up, A	-	Start on Stage 4-1.
A, B, Left, Left, Right, Right, A	-	Start on Stage 5-1.
A, B, Up, Down, Left, Right, A	-	Start on Stage 6-1.

Source: gamefaqs.com

Looney Tunes (USA), Looney Tunes: Bugs Bunny to Yukai na Nakama-tachi (Japan)

(GEN) Extra 7 lives (added 28.08.18):
At the title screen, press A, B, B, A, Select, Select. A sound confirms correct code entry.
Source: gamefaqs.com

(UNI) Restore HP (added 28.08.18):
During the game, pause it with Start, then press A + B + Select to restore HP. This may be done only once per level.

Lost World, The: Jurassic Park (USA), Monde Perdu, Le: Jurassic Park (France)

(GEN) Title screen cheats (added 28.08.18):
At the title screen, press one of the following codes to get a corresponding effect. Also you can activate more than one code at once.

Up, Down, B, B, A	-	Replaces Password screen with Stage select screen.
Select, Up, Up, Select, Down, Down	-	Infinite ammo.
Left, A, Up, Right, A, Down	-	infinite health.

Source: gamefaqs.com

(BUR) Game genie (added 28.08.18):

0A1‑E8F‑E6A	-	Replace the title screen with an unused Cutscenes viewer. Note, "LABS EXPLODE" crashes the game. Also there are no ending cutscenes in the list. Also worth nothing, but there is an unused cheat sequence between the used ones at 0x00819F in the ROM (Select, A, Down, B, Up, Down), which may be intended to access this particular viewer. Source: gamefaqs.com
775‑12F‑3BB+C2A‑A4E‑C41	-	Re-enables the Memory viewer/Crash handler. Start the new game it wil appear as soon as level starts.

Lucky Luke

(FIX) Stage skip and Restore HP (added 28.08.18):
At the title screen, press Down, Up, Down, Up, Left, Right, Left, Right. A sound confirms correct code entry. During the game, press Start to instantly restore HP or press A + B + Select to skip current level.
Source: gamefaqs.com

Lucle

(GEN) Options menu (added 20.02.17):
At the title screen, enter Up, Down, Left, Right, A, B, B, A, B, A, B, A, A. The palette on the "L" letter in title inverting indicating correct code input. Now start a new game.
Source: makainyumon.web.fc2.com

(BUR) Hidden text (added 20.02.17):
The SRAM init signature in this game contains some devs credits:

KOJI-YOSIDA 5963

Mach Go Go Go

(UNI) Secret car (added 30.08.18):
Start a new game, at the "MACHINE SELECT" screen, put cursor to "MACH" (top-left character), then press Right, Up, Up, Left, Down, Down, Select. A new machine "ALBATROS" will appear instead of "MACH". This machine has best acceleration out of all cars: 10.

(UNI) Secret passwords (added 31.08.18):
Complete the game once to activate the "PASSWORD" menu option at the title screen. Since that game uses CRAM saves to keep current game data, this password screen is used only for input a secret passwords which never told you by the game itself. Not sure where you were able to find these passwords, but it seems they may spread over some magazines later. Note, the secret car also has a full set of corresponding passwords.

Effect

WAGP

Mach

Stinger

Cutthroat

Red Papillon

Shooter's Arrow

Warp

Albatross

Regular items: default
Special items: all (except "Gallant" for cars other than Mach and "Mirage Shoot" for all)
Stats: default

Yes

SEFETYSEVEN

LOUNISYGRET

BIUYDKOUSJY

MOISJUDTEGY

JUTRBUYGCDA

LPOBTDIUJRS

QHUYARSPLUD

Regular items: default
Special items: "Mirage Shoot"
Stats: default

BIUSYHDREPL

NOKUSHIDYGR

YGSLODHGRAU

ZGSOIDKUFBT

RBLOSUJDIYG

HGGSIUAYWTB

CISKJDTFEPI

Regular items: all
Special items: all (except "Mirage Shoot" for all)
Stats: default

Yes

TGOILSNZUKP

PSIYEUIBSAM

IUAHDYFSALM

NSIHDYEJOSA

MODUYHFIYAT

YEUTDNBPSAI

MALSDJNSALJ

Regular items: default
Special items: default
Stats: 30 PW/SP/AC/DE/HP

NJLDCMSALNP

TETFAKSSKHA

REFDLSMJCKJ

LMKLDVSDLDL

PSJDHACSMJH

WASBKSDLKMD

TGEVDJKBVKS

Regular items: default
Special items: default
Stats: 50 PW/SP/AC/DE/HP

SJDJVHBKLSD

KAVAJHXLDMC

KLDJVJNCLML

PWJDXEVDHXD

DFQWXBKNXML

PUDCUGJHSWL

BHSUYDRTAMO

Regular items: default
Special items: default
Stats: 70 PW/SP/AC/DE/HP

XSTGDUFJYRT

VYSGFDIUYFY

BSHUDTHODFY

NDSOIUDOASN

KDHGGSJDLSD

KSHFAFSVZMU

LOSFDJHYFUJ

Regular items: all
Special items:
for Mach: "Mirage Shoot".
for all others: all (except "Mirage Shoot")
Stats: default

No for Mach
Yes for all others

BKCKUSYTJDF

EWKDXKHDYBI

BDKSNLSHGUI

FRYDIHKSYSU

PLOIUKUSJGY

GOUANKZNSAH

DJCJGNSXLSM

Show ending

GOUHIBIKIEN

JETSONENDIN

MIKAELENDIN

SECILENDING

XRESAENDING

AKIHABARAEN

NKJDOUAHTDU

(BUR) Game genie (added 30.08.18):

071‑64F‑E6A

Re-enables the unused and seems unfinished "DEBUG MODE" screen. Only "STAGE" work here. "MUSIC" is only a text on the screen.

Source: tcrf.net

Madden '95

(BUR) Game genie (added 03.09.18):

051‑93F‑E62+CF1‑9AF‑081+761‑9BF‑083

Re-enables an unused "SOUND EFFECTS MENU". There is another string for another menu "MUSIC MENU" but no one access it.

Madden '96

(FIX) Extra teams (added 04.09.18):
When selecting teams in "EXHIBITION" mode, choose "ALL MADDEN" team, hold Select + B then press Right once to select first extra team "TEAM HALESTORM". At this team, while still hold Select + B, press Right one more time to select second extra team "DA FUNHOUSE".
Source: gamefaqs.com

(UNI) Extra game length (added 04.09.18):
When selecting the game length in any game mode, choose "60 MINUTES", hold Select + B then press Right to set game length to "4.0 MINUTES".

(UNI) Instant scores (added 04.09.18):
In any game mode, at the pre-game menu, put cursor to "START GAME" option, hold either Select or B then press A. According to button held either the Home or Visitor team will start the game with 190 points correspondingly.

(UNI) Game skip (added 04.09.18):
At the screen before the pre-game menu where you choose one of two selected teams to play, hold Down then while holding it do the Instant scores cheat. The current game will be skipped instantly with team which you gave Instant scores as a winner. You may not only skip and win any playoffs or season games, but also exibition or even demo games (if hold Select or B with Down and just wait for demo starts). However this is pointless.

(UNI) Instant coin toss (added 05.09.18):
At the coin toss screen, choose one of two sides then quick hold Select + B and wait the result which now will always be the same you selected rather than randomized.

(BUR) Game genie (added 04.09.18):

004‑0FF‑F7E	-	There is a working crash handler in this game. When triggered during the game in GB mode, it starting to change palette in a dead loop causing the specific screen effect. When played in SGB mode, it displays two information screens with current game statistics, then jumps to the "INSTANT REPLAY" mode. When exit from it, goes to the same palette lock up as in GB only mode. Source: tcrf.net
803‑D78‑809	-	Replaces the "START GAME" menu option of any game mode with "SOUND EFFECTS MENU". It seems this is some kind of leftover from the previous part of the game. The screen is not initialized properly which causes some graphical glitches, as well as actual sound play commands are disabled and you only able to change menu items.
A14‑8B8‑C44	-	Replaces "INSTANT REPLAY" option of "EXHIBITION" game mode with its debug version, which works mostly the same (scroll cursor throught the play field, point to any player to see the info about it), but instead of replaying the currently played game from the beginning, it used to play current game frame by frame when Select pressed.

Magic Ball (Unlicensed)

(BUR) Hidden text (added 06.09.18):
There is a hidden copyrights string at the beginning of the ROM:

GOWIN MAGIC BALL 930920

There may be more Shift-JIS encoded text near, investigate.

(BUR) Game genie (added 06.09.18):

6E7‑97B‑917

Re-enable a hidden Level editor. It is very plain simple and buggy. There is also an unused string "EDIT" in the text data set.

Magic Maze (Unlicensed, Sachen 4-in-1 Vol.8)

(BUR) Game genie (added 17.05.16):

402‑3AF‑5DD+4F2‑3BF‑B3A

Unless many other games by Commin, this one has a fully functional "Creatronic" logo, which may be re-enabled somehow by these codes. Unfortunately, this code does not allow you play the game.

Magical Taruruuto-kun

(GEN) Sound test (added 06.09.18):
At the title screen, press Select, a Taruruto character will disappear from the screen. Select sounds/music with A/B, press Start to play them at once.
Source: urawaza.in

(BUR) Game genie (added 06.09.18):

010‑07F‑E6A

Re-enable debug features. At the title screen hold one of following buttons and press Start to get to the corresponding stage:

Right	-	Stage 2
Down	-	Stage 3
Left	-	Stage 4

During the game, press Start then one of the following buttons to get a corresponding effect:

Up	-	Increment lives.
Down	-	Toggle invincibility on and off.
Left	-	Toggle free walk mode on and off.

Magical Taruruuto-kun 2: Raibaa Zone Panic!!

(UNI) Instant items (added 07.09.18):
During the game, press Start to pause it. Press Left, B, B, Right, Select, then one of the following buttons to obtain one of items instantly. This is only works if no items already taken. There are no indication on HUD what item is taken, only wear its effect. As against the regular items, items obtained with this method has no expiration period, they only be removed when stage is complete/loose or when any other regular item were taken.

Up	-	"Shoes" item. Gives high jump and faster walking speed.
Down	-	"Tongue" item. Literally enlarge your tongue.
Left	-	"Poo" item. Grants you invincibility, but also disables ability to eat buns.
Right	-	"Pie" item. Slow down all enemies.

Magical Tower (Unlicensed, Sachen 4-in-1 Vol.5)

(BUR) Game genie (added 12.05.16):

112‑6AF‑B32+252‑69F‑E64

Re-enables the unused "Mega Duck" logo at the game boot.

Magnetic Soccer

(UNI) Sound test (added 07.09.18):
Any time during the game except the title screen, press A + B + Select + Start to perform a Soft reset. Quickly, while screen fades, press Up + Right.

(UNI) Skip to P.K. (added 07.09.18):
Start a new game either in 1p or 2p modes, complete game setup, but at the last option ("COM LEVEL" for 1p mode, "SET" in 2p mode), press A + Start at the same time. The game will over immediately with score 0-0, so P.K. series begins.

Mahou Kishi Rayearth (Magical Knight Rayearth)

(GEN) Sound test (added 08.09.18):
At the title screen, press Select 32 times.
Source: urawazagame.com

(BUR) Game genie (added 08.09.18):

498‑A3C‑19A

Replaces in-game Save menu with a complex Debug menu. You can Load from it, change walking speed, enable or disable debug output/free walk/random encounters, jump to any map and also listen to all music/sound effects and a PCM voices for currently selected character.

Mahou Kishi Rayearth (Magical Knight Rayearth) 2nd: The Missing Colors

(UNI) Sound test (added 10.09.18):
At the title screen, press B 32 times.

Makaimura Gaiden: The Demon Darkness

(BUR) Game genie (added 11.09.18):

BF0‑68F‑E6A+0F0‑30C‑D5A

Each bit of the byte at ROM offset $000068 is a debug flag. First code set most of them at once except one that disables the action stages HUD. Another code replaces the Soft reset button combination (Select + Start) also activated by the debug flags, with regular one (A + B + Select + Start) to not to interfer with Sound test feature. Some features are enabled via holding a particular button on the title screen before starting the game with Start. These buttons may be combined to enable more than one effects at the same time.

Feature	\|	Title button	\|	Notes
Sound test	\|	Select	\|	Appears after the title screen immediately.
Stage select	\|	B	\|	Appears after starting a new game. Note, Stage 00 is a debug stage, not used in the game.
Invincibility	\|	Down	\|	Works on the action stages against any enemies or harmless obstacles like spikes.
Debug output	\|	A	\|	Activates after switching the maps at the bottom part of the screen, which also replaces HUD in the action stages.
Action mode menu debug	\|	Always on	\|	During action stages, press Start to enter the items menu. Press Select to get all items. Press A to increase "J" (jump height). Press B to increase "W" (flight stamina).
Free walk	\|	Always on	\|	During either overworld or action stages, hold A, press Select to toggle Free walk mode on and off. Use D-Pad to move character to any part of the screen.

Mappy (Namco Gallery Vol.1)

(BUR) Game genie (added 09.12.18):

000‑0BB‑80A+000‑0CB‑B3E

Re-enables "DEBUG" mode. During the game, press Select to enter the Debug mode menu, select stage and press Select again to play it, select music and press A to listen to it.

Mario's Picross (USA, Europe), Mario no Picross (Japan)

(FIX) CRAM clear (added 14.09.18):
To erase an individual save slot, at the "DATA SELECT" screen, put cursor to slot to be erased and hold A + B + Select for a while, then press A when game ask to erase or not. To erase all saved data at once, before powering the console, hold Up + Left + Select then power it up. Game will ask to erase save data or not. Press corresponding button to agree or decline. Note, both codes are described in the original english instruction manual for this game. However, the all erase code there is incorrect, it claims that button code is Left + Select.
Source: gamefaqs.com

(GEN) SGB extra border palettes (added 14.09.18):
In SGB mode, at the title screen, hold one of following buttons and press A or Start to change default border color (Green) to one of four extra colors:

Up	-	Black
Down	-	White
Left	-	Yellow
Right	-	Red

Source: gamefaqs.com

(BUR) Hidden text (added 14.09.18):
The game uses following name as part of the internal RAM signature:

Noriaki Teramoto

Also the sound engine bank contains copyrights of the composer:

DSEQ
APE (C) mcmxciv by Toshiyuki Ueno
pcs26448@asciinet.or.jp

Source: tcrf.net

Marmalade Boy

(UNI) Secret passwords (added 15.09.18):

キミワカシコイ
・・・・・・・

Literally translated as "You Smart". Jumps directly to ending with making staff sequence.

Masakari Densetsu: Kintarou Action Hen

(GEN) Secret passwords (added 15.09.18):

はちのすほしい！！！！	-	Start the game with extra 20 honeycombs.
おつかあのたすけ！！！	-	Debug mode. Press Start to advance to selected level. Press Select to switch to Cutscene view select mode. Select with A/B in all modes.

Source: makainyumon.web.fc2.com

Masakari Densetsu: Kintarou RPG Hen

(FIX) Debug mode (added 17.09.18):
Before powering on the console, hold A + B + Select + Down to enable debug letovers the developers forgot to remove. During the game:
The main game menu now have two extra options "SAVE" and "LOAD".
Hold B to free walk throught obstacles.
Press Start to toggle random encounters off and on. Also when in battle, you will always win.
Hold A, press Start to open simple party editor. There are a lot of values of all 4 party members and its stats.
Hold B, press Start to open simple memory watch. There are no proper font letters for hexadecimal numbers though.
Hold Select, then press Start to instantly erase save data without any confirmation. Note, the B button used normally to open ingame menu when character is not moving, but when menu is open debug codes does not work. So you need either, to hold B button while move or press B once to open menu first then press and hold it to close menu, in order to use debug features.
Source: makainyumon.web.fc2.com

Maus, Die

(UNI) Stage select:
At the license screen, quiclky enter A, B, Up, Down, Down, A, Left. During the game, on pause, hold A + B and change the level number with D-Pad buttons, then unpause. Or just hold A + B and unpause to skip to the next level.

(UNI) Infinite lives:
At the license screen, enter Up, Left, Right, Down, Left, Up, Right, Up, Down, Right, Up, Right, Down, Left, Left, Down, Right.

(UNI) Secret message:
At the license screen, enter Up, Left, Down, Left, Up, Right, Down, Up, Right, Up, Right, Down, Left, Up, Down, Right, Down, Up, Down, Up, Right, Up, Left, Up, Right. Complete the game (you can use the Stage select cheat as well). After the credits roll is over, hold Up + Right + B, then press Start. The dedication screen will appear, the same as in some other Bit Manager's games.

Max (USA, Europe), Rubble Saver II (Japan)

(GEN) Extra life (added 17.09.18):
Start a game, begin to play STAGE 3. Go down to the bottom of the level. In leftmost part of the floor there is a statue on a hill. Shoot this statue from the right side, then from the left side, repeat the same one more time, then shoot one more time from any side to obtain an extra life. This can be done only once per game.
Source: makainyumon.web.fc2.com

Medarot (Kabuto, Kuwagata, Parts Collection 1 and 2 versions)

(GEN) Options mode (added 07.10.18):
At the title screen, hold Select then press A or Start to enter the menu whete you can listen to the music and sounds and chose to clear the save data as well.
Source: urawaza.in

(UNI) Medal levels view (added 11.10.18):
At the title screen, press Up, Left, Down, Right, Up, Down, Left, Right, Select. Now during the game, when you able to access the in-game menu with B, go to first menu option "ケイタイ", then "メダル" ("Medal"). Choose any medal, then at the medal info menu press Left to change current medal level (up to maximum 12). Note, this will only display the possible levels of current medal and its appearance, you cannot keep selected level so this cheat hardly useful enough.

(UNI) Disable random encounters (added 11.10.18):
At the main menu, go to configuration mode, press Select, Select, Select, Select, Select, Up, Down, Left, Right, Start. This disables the random encounters during the game.

(BUR) Debug leftovers (added 11.10.18):
There are few debug leftovers still in the game barely working. Since there is no more code to acces all these features inside the game, you can only access it by modify the main/sub system routine indexes at $C5C0/$C501 runtime. Here is a table with available values.

$C5C0	\|	$C5C1	\|	Effect	\|	Notes
$06	\|	$0B	\|	The debug menu.	\|	You can select story, event number and level. These values are applied as current scenario position and world triggers and NPC states are changes according to it. Need to mention, $06 mode is for ingame, so you don't need to set it manually, but start a new game instead.
$0B	\|	$00	\|	VRAM/Sound test	\|	At start, there are three screen will be displayed with currently loaded tile data, skip them with A button. The last screen will display the Sound test menu, however, since there are no proper font loading here, you may see the garbage unless you access this screen after the debug screen described below.
$0C	\|	$00	\|	Map test	\|	This screen does load a proper font to display some kind of menu leftover. There is only one option is active selecting any game map to start with. Sometimes this may cause heavy glitches. You may access this menu also during the game by using the Game genie code 0C3-B6B-B3A, then just do the generic "Sount test and CRAM clear" cheat at the title screen.

Source: tcrf.net

Megaman IV (USA), Rockman World 4 (Japan)

(BUR) Game genie (added 23.10.18):

1A9‑BAF‑A2A

At the title screen, start a new game to access the debug menu instead. There are a lot of various options to enable all items/weapons, play any stage with either infinite ammo or health.

Source: tcrf.net

Megaman V (USA), Rockman World 5 (Japan)

(BUR) Game genie (added 23.10.18):

C55‑0CF‑2AA+045‑0DF‑E6B

Replaces the Soft-reset code (A + B + Select + Start) with debug menu similar to menu in previsous version (see above). Additionally the message test is available here.

Source: tcrf.net

MegaMemory v1.0 by Interact

(GEN) Factory test (added 11.10.18):
Hold A + B + Select + Start before powering up the console.
Source: tcrf.net

(BUR) Hidden text (added 11.10.18):
There are few unused debut text lines inside the ROM. The First one is an unused copy of the same line for "Factory test" (see above):

RAM banks = ‑
token = controller 2
run+error=‑

Also, the game uses following string for test the CRAM banks of inserted cartridge:

Mushroom/Kingpin

Source: tcrf.net

Megami Tensei Gaiden: Last Bible

(UNI) Secret names (added 24.10.18):
Enter following word as a main character name. Note, that nigori symbols must be input separately.

ポン

Start a new game with strongest combat parameters.

Megami Tensei Gaiden: Last Bible II

(FIX) Secret names (added 24.10.18):
Enter one of the following words as a main character name. Note, that nigori and panigori symbols must be input separately.

ポンです	-	Start a new game with strongest combat parameters. Source: urawaza.in
モンスター	-	Monster viewer will appear when all three character's names are input. All monsters is displayed one by one then return back to the name input screen.

Meitantei Conan: Chika Yuuenchi Satsujin Jiken

(GEN) Secret passwords (added 15.08.16):

MGTEST

Test screen. Allows you to play any mini-games or play the game with all events completed by default.

Source: urawaza.in

Meitantei Conan: Giwaku no Gouka Ressha

(GEN) VIP Room (added 27.10.18):
Start a new game. Solve one of three cases with a best result, get the final password and use it to start another game (if you solve the case wrong or didn't find all the clues you won't get any passwords). Solve the second case also with the password and use it to start a game for the third time. If all three cases are solved right, then the "BETTER ENDING" will be shown following with a Credits. After ending is over, there will be a final message from Conan about Memo found in VIP room safe (VIP passanger suicide case). This is a final riddle of the game, you must solve it to obtain a 6-letter password (in case you can't solve it the password is "3VA DGO"). After the final message, instead of the intro the game starts from the password screen which this time accepts only one correct 6-letter password mentioned before. If all done right, you'll access the secret scenario where you hadn't solve any murder cases but walk around the train and talk to other people.

Meng Huan Zhi Xing (Phantasy Star) (Unlicensed)

(UNI) Stage select (added 28.10.18):
During the intro before the title screen any time, press Up, Up, Down, Up, Left, Right, Left, Right.

(UNI) Instant battle win (added 28.10.18):
During the game at battle press Start, A to instantly set the enemy's HP to 0 thus win the battle immediately.

Mercenary Force (USA, Europe), Tenjin Kaisen (Japan)

(FIX) Title cheats (added 02.11.18):
At the title screen, press one of the following button codes to activate a corresponding effect, then press Start.

A + B + Select + Up	-	Extra 50000 money in the US version or 1000 money in the Japanese version from the beginning. Also you'll get worst ending when finish the game. Additionally Stage select will be enabled (at the Stage number screen press Right). Source: gamefaqs.com
A + B + Select + Down	-	The same as code above but disables the Stage select mode if it is already enabled.
A + B + Left	-	Hard mode. Enemy bullets are 2 times faster, all the bosses have doubled HP.

Metal Masters

(FIX) Stage skip (added 02.11.18):
During the game, press Start to pause it then enter Up, Right, Up, A, Left, Down. A sound confirms correct code entry. Now, during any fighting stage press Start then A + B to instantly kill the enemy robot and so end the battle. Do the same at the side scroller stages to skip right to the boss.
Source: gamefaqs.com

Metroid II: Return of Samus

(BUR) Game genie (added 08.08.16):

002‑4BB‑5D4

Re-enables the debug mode.
On pause:
Press Left/Right to select item, press A to toggle item.
Press Up/Down to change weapon (valid values are 0,1,2,3,4 and 8).
Hold B, press Left/Right to change max number of energy tanks.
Hold B, press Up/Down to increase max number of missiles by 10 (decreasing only affects current number of missiles), max missiles are 9999, only 999 will be displayed.
Hold A + B, press Left/Right to change the metroids counter.
During the game:
Hold B + Select while transiting between two different locations (i.e. from the starting location to the first cave or back) to jump directly to the Final Boss.

Source: tcrf.net

Mick & Mack as the Global Gladiators (Prototype)

18th January version:

(UNI) Cheat mode (added 30.05.17):
This cheat only exists in the latest known prototype. Pause the game, then press Left, Up, Right, Down, Left, Left, Up, Up, Right, Right, Down, Down, Up, Down. This will toggle the internal cheat flag on or off. If cheat flag is on, the message "ON" will be displayed above the "PAUSE" message. Otherwise you'll see the "OFF" message. When cheat is on you is invulnerable for enemies and its projectiles, but still could die in the water or ground pits and during the last boss battle. Press Select during the game to skip current stage. When you lose the game and return back to the title screen, pressing any button will bring you to the secret developer's message scroller instead of the "OPTIONS" screen. This message is about 1.5Kb in size and cyphered with xor code, so you couldn't see it inside the ROM easily. Also, this cheat replacing the ending screen with the message:

     CHEAT MODE
    WHAT A LOSER


  CODE BY D STONES
 GRAPHICS BY A PANG

Mickey no Tokyo Disneyland: Cinderella-jou Mystery Tour

(UNI) Secret passwords (added 03.11.18):
Note, all these passwords are just some pre-defined states of this game. The same results may be acquired with the valid password generator as well.

ＴＤＬミシキマウス	-	"TDL Mickey Mouse". lives 99, balls 999, stage 4-2, ballon lv3, 100% complete, all items.
ＭＭＳＰＥＣＩＡＬ	-	"MM Special". lives 55, balls 555. stage 1-1, balloon lv3, 0% complete, no items.

(BUR) Hidden text (added 03.11.18):
There is a Shift-JIS encoded string at 0x251 in the game ROM with a hidden copyright text:

Ｐｒｏｇｒａｍｅｄ　ｂｙ　ＡＴＳ　ｓｉｎｃｅ　１９９５

Mickey's Chase

(BUR) Debug leftovers (added 03.11.18):
During the game, write $01 to RAM address $C534. Now press Up/Down to switch between two CHR data banks, press Select to access the Sound test mode. There is no return from here back to the game except reset.

Micro Machines

(UNI) Head to Head mode cheats (added 04.11.18):
Start a new game in "Head to Head" mode either in Tournament or Single Race modes. During the game, press Start to pause it, then enter one of the following codes to get a corresponding effect. If done right, the wave slide down on the screen. Codes may be input multiple times without limits.

Down, Down, Up, Up, Left, Left, Right, Right, Left, Left, Down, Down, Up, Up	-	Max speed for both players.
Left, Right, Left, Right, Up, Down, Up, Down, Up, Down, Left, Right	-	Lap 1 for both players.
Up, Down, Left, Right, Up, Down, Left, Right	-	Lap 9 for both players.

(UNI) Title cheats (added 04.11.18):
At the title screen or either on any demo sequence or demo stage presentation screens (except places where text is typed out), input one of the following button sequences to get a corresponding effect. If done right, the wave slide down on the screen.

Down, Up, Left, Right, Up, Up, Down, Down, Left, Left, Right, Right	-	Enables the player switch option in any game mode except "Head to Head". During the game press Start then Down to select the player to control. Also at the title screen or at the demo/presentation sequence press Select to open an Options menu where you can toggle some additional cheat options on and off. "STATIC" disables CPU AI for all races "VIDEO" switch off cinematic sequences during the game. "INFY" sets the infinite lives. "SKIPPER" allows to select any Challenge mode track instantly instead of playing them one by one sequentially. Need to investigate what actualy "STD LK" and "HOVER" option are doing.
Left, Left, Right, Right, A + B	-	"The 15 Puzzle" hidden mini game. The picture here is a Big Red Software logo made by programmer RFredW.
Up, Up, A, B, A, Down, Down	-	Game credits, same as in the ending.
Right, Right, Left, Left, Up, Up, Down, Down, Right, Left, Up, Down, A + B	-	Disabled or unfinished cheat, does nothing except accepting the correct code input.

(FIX) Challenge mode secrets (added 04.11.18):
Almost every stage in the Challenge mode (except Tank, Time Bonus, Qualify and Final stages) has a hidden spots on the map where you may get a special prize. What you need is just to press Start at the particular map position. The table below describes complete list of available secret points with its effects as well as explanation how to reach them. The map coordinates are in the basic map chunks area units. For example, a pile of corn flakes on the table within 4 table-cloth squares is exactly one map unit. The top-left corner of the map is a starting point with a coordinates 01,01.

Round	\|	Name	\|	Type	\|	Coords	\|	Effect	\|	Where it is
1	\|	The Breakfast Bends	\|	Four By Four	\|	9, 5	\|	1st place	\|	There is a napkin in the top-middle side of the track. To bottom-left from it the nearest corn flakes heap.
2	\|	Desktop Dropoff	\|	Sport Cars	\|	11,14	\|	Extra life	\|	In the middle of the gap between two tables when you jump off from the tablet. Source: gamesradar.com
3	\|	Oilcan Alley	\|	Warriors	\|	23,29	\|	Min friction	\|	At the bottom-right corner of the track, move straigth diagonally down-right until gap filled with nails between two piles of nuts to the right and to the bottom.
4	\|	Sandy Straights	\|	Turbo Wheels	\|	9,12	\|	Lap 1	\|	At the last up-right turn after the sand castle before the finishing line. Stand at the river bank corner.
5	\|	Oatmeal in Over-Drive	\|	Four By Four	\|	1, 1	\|	Min inertia	\|	At top-leftmost position, very close to the table corner.
6	\|	The Cue-Ball Circuit	\|	Formula One	\|	15,23	\|	Extra life	\|	Area around a pale ball above the track at bottom-rightmost hole of the table.
7	\|	Handyman's Curve	\|	Warriors	\|	5, 4	\|	1st place	\|	At the top-left corner of the track, an area above the Oil tank. Accessible via the gap between nut and the fuze at the bottom-left corner of the oil tank.
9	\|	Sahara Sandpit	\|	Turbo Wheels	\|	16, 8	\|	Min friction	\|	Top-middle part of the track. The lower half of the foot print just below it.
10	\|	The Potted Passage	\|	Choppers	\|	4,14	\|	Min inertia	\|	From the starting line go straight back. Stand exactly where the tube meets the bushes.
11	\|	Fruit Juce Follies	\|	Four By Four	\|	16,31	\|	1st place	\|	At the middle-bottom part of the track there is a corn flakes box. Stand right below of it exactly under the name and very close to the table bottom side.
12	\|	Foamy Fjords	\|	Powerboats	\|	23,19	\|	Min friction	\|	At the rightmost part of the track, ram into the cap of the Shampoo bottle on the path.
14	\|	Pitfall Pockets	\|	Formula One	\|	3,26	\|	Min friction	\|	Area around the pale ball near the bottom-left hole of the table.
15	\|	Pencil Plateau	\|	Sport Cars	\|	30,27	\|	Min inertia	\|	Stand at the very bottom-right corner of the small isle where the first jump tablet is located.
16	\|	The Dare-Devil Dunes	\|	Turbo Wheels	\|	25,10	\|	Extra life	\|	At the top-right side of the map, there is a right turn before the road loop with two lakes inside. Instead of getting this turn go straight up and stand very close to the left side of third lake near two lakes in the loop.
17	\|	The Shrubbery Twist	\|	Choppers	\|	17, 9	\|	Min friction	\|	At the right side of the track tere is a fuse box with a switch button at its top-left corner. Try to squeeze inside the bushes right above it.
18	\|	Perilous Pit-Stop	\|	Warriors	\|	12,27	\|	Min inertia	\|	From the starting line go straight up-left to the nearest pencil.
21	\|	Soap-Lake City!	\|	Powerboats	\|	7,16	\|	Lap 1	\|	Left-middle side of the track. Stand at upper part of the short tube, just before the bubbles on the route.
23	\|	Chalk-Dust Chicane	\|	Formula One	\|	17,30	\|	Extra life	\|	Stand very close to the bottom right hole of the larger table.

(BUR) Hidden text (added 04.11.18):
There is an unused version string in the last bank in the internal game encoding:

Vsn 3.81 26/8/94

Midori no Makibaou

(BUR) Game genie (added 05.11.18):

000‑80F‑F72

Reset the game to access the debug menu. Here you can listen to the music and sounds, run any game routine including all endings (MAINNO up to 16 are valid values). Select MAINNO==01 to activate simple CHR viewer. Also you can edit horse statistic here.

Source: tcrf.net

Mighty Morphin Power Rangers: The Movie

(GEN) Secret passwords (added 05.11.18):

3844

Ending.

Source: gamefaqs.com

Mikeneko Holmes no Kishidou

(UNI) Password generator (added 08.11.18):
Note, most of flags and values meaning not known currently, need to investigate more. The main value for password is Var 6 which is chapter number from 1 to 5. Other bits are ignored here so they are disabled.
Also here is a secret Flag 23 which allows you to access the Sound test mode. Just generate password with only this one Flag set.
Also note, you may generate the same password as described by urawaza.in if set Flags 1,2,23,24 and also first bits of two vars 1 and 6. This is a default game-generated password but with Sound test Flag set. When this Flag is set, all other Flags and Vars are ignored.
Source: urawaza.in

Mini 4 Boy

(GEN) Secret names (added 12.11.18):
Note, there are two names you need to input before the game: a player's name and a car's name. You may input either the secret player's or car's names only, so you'll get just one of the corresponding effects.

しゃちょう	-	Enter as a Player name. Extra 10000 Money.
パーシいっぱい	-	Enter as a Car name. Extra parts: s/f/x-chasis, speed/corner aero, n-wheel 2, n-tyre 2/3, n-roller, n-stabilizer, f/s/r-roller set 1, n-plate.

Source: makainyumon.web.fc2.com

Mini 4 Boy II: Final Evolution

(GEN) Extra SGB border (added 12.11.18):
At the "J-Wing" logo screen, press Select 5 times.
Source: tcrf.net

(FIX) Secret names (added 12.11.18):
Input one of following words as a corresponding name.

Word	\|	Name	\|	Effect
ポイント	\|	Player's car name	\|	Extra 800 points at the beginning of the game.
かいはつしゃ	\|	Player's name	\|	Developers names and messages menu.
ゴールド	\|	Player's car name	\|	Extra 8000 money at the beginning of the game.
サウンド	\|	Player's name	\|	Sound test.

Source: tcrf.net

Mini Putt

(BUR) Game genie (added 15.11.18):

233‑14F‑806	-	Re-enables link mode selection menu before the main game select menu. You can select the regular game on single Game Boy, on two Game Boys linked via cable and the 4-player game with a special adapter. Linked modes are fully functional, so this is unknown why they removed it from the released version.
06C‑2FA‑F7A+03C‑B1A‑E62	-	Additionally, there is a third game type planned for linked modes: "FIGHT". All coding is still in the ROM, they just removed all additional code to display the selection menu with three game modes in it. Use these two codes in addition to the previous one to re-enable the third mode selection ability. In this mode both players are plays on the field at the same time. Unfirtunately, seems this mode were unfinished or not debugged well. The game hangs after first move.

Mini Yonku GB Let's & Go!!

(BUR) Game genie (added 21.11.18):

07B‑0DB‑F7E

Access the disabled debug menu when hit "START" at the title screen. There are two pages of this menu, at the first one you could enable or disable ingame debug, select one of the system routines for test or watch events. At the second page there are a music and sound tests, parts viewer and some other.

(BUR) Hidden text (added 20.11.18):
There is a hidden copyright text in the Sound engine ROM bank:

DSEQLITE
CRTS(C) mcmxcvi by Toshiyuki Ueno
toshi-u@tau.bekkoame.or.jp

Source: tcrf.net

Mini Yonku GB Let's & Go!!: All-Star Battle Max

(BUR) Hidden text (added 21.11.18):
There is a hidden copyright text in the Sound engine ROM bank:

DSEQLITE
CRTS(C) 1996,1997 by Toshiyuki Ueno
toshi-u@pobox.com

Source: tcrf.net

Miracle Adventure of Esparks: Ushinawareta Seiseki Perivron

(UNI) Power up (added 22.11.18):
During the game, press Start to pause it, then Start + Select + B + Up to unpause and instantly obtain an extra 9 fire-balls and set the scores to xx30xx, so you'll have an instant armor power up. This cheat can be done unlimited amount of times.

Mole Mania (USA), Moguranya (Japan)

(FIX) All items (added 23.11.18):
During the game, press Start to enter the game menu. Hold Select, then press Left, Right, Left, B, B, Right, Left, Right, A, A (for the US version) or Up, Up, Down, Down, Left, Right, Left, Right, B, A (for the Japanese version).
Source: makainyumon.web.fc2.com

(BUR) Hidden text (added 23.11.18):
There is a hidden copyright text near the end of third Sound engine bank:

1996/4/19
PM 5:30
MOGURANYA
SOUND PROGRAM
& MUSIC
& SOUND EFFECTS
ALL DATA WERE
WRITTEN BY
TARO BANDO

Source: tcrf.net

(BUR) Game genie (added 23.11.18):

0F3‑D0B‑E66 (for the US version)
0F3‑DBB‑E66 (for the Japanese version)

Re-enables the disabled Error message upon starting a game. Original screen written in Japanese, but for all western versions it left untranslated and reads only garbage.

Source: tcrf.net

Momotarou Dengeki

(GEN) Secret passwords (added 24.11.18):

五九六三

Sound test and Object viewer.

Source: urawaza.in

Momotarou Dengeki 2

(UNI) Secret passwords (added 24.11.18):

五九〇一一五 ("590115")

Start a new game on Normal mode with invincibility.

(BUR) Unused Sound test (added 24.11.18):
During the game in emulator, pause emulation and set RAM address $C0F6 to $01 and $C0F7 to $00. There is no display, only portions of characters will be displayed in place of HUD. You can see something only when start to move cursor and change BGM/SE indexes with D-Pad. Since there is not known how to acces it properly, it will crash after attempting to exit via last menu option.

Momotarou Densetsu Gaiden

(GEN) Soft reset easter (added 27.11.18):
The Soft reset code in this game (hold Start, press Select) not only resets the Game Boy, but also shows the animated "Hudson Soft" logo scrolling down just like the Nintendo logo does at the console boot.
Source: urawaza.in

Monopoly

USA and European versions:

(GEN) License screen skip (added 26.11.18):
To instantly skip the License screen press A + B + Start. The Japanese version allows you to skip it with any button instead.

Monster Maker: Barcode Saga

(UNI) Ending (added 26.11.18):
At the title screen, hold Select, press Up, Right, Down, Left, Up.

Monster Truck

(FIX) Title screen cheats (added 28.11.18):
At the title screen, wait when Truck stops at the center of the screen or press any button to hold it manually. Now you need to press buttons for a corresponding number of times in any order, just make sure you pressed every needed button for a particular number of times. The lists of button and its press counts for every possible cheat combination described in the table below. When done, press Start. All possible combinations and its effects are in table below.

Select

Right

Left

Down

Effect

1 time

Ending.
Source: urawaza.in

5 times

7 times

2 times

Stage select.

1 time

2 times

3 times

5 times

6 times

7 times

8 times

Sound test.

Montezuma's Return!

(GEN) Secret passwords (added 28.11.18):

ELEPHANT	-	Infinite lives.
SUNSHINE	-	Unlock all doors.

Source: gamefaqs.com

(BUR) Hidden text (added 28.11.18):
There is a copyright text at the beginning of the ROM:

COPYRIGHT TAKE 2 1998

Mortal Kombat

(UNI) Fixed difficult (added 28.11.18):
Hold A + B then power the console on and wait for the license screen. From now, there will be one fixed difficult level 2 for all battles no matter what current stage is. Difficults are in range from 0 to 9, so this is kinda simplify beating the game.

(FIX) Unlock Goro (added 28.11.18):
Beat the game, wait for the credits are about to over. At the "THE END" message, hold Up + Left + Select + A then wait when this message is disappear. If done right, there will be a Goro picture before the fight (fighter selection menu is skipped, always play as Goro) where in addition to message "GORO LIVES..." an additional line appears at the bottom of the screen "AS YOU...". The difficult for all fights if played with goro is maximum from the beginning (9). Also in this mode, all regular character's names are changed to different names of some devs/designers of Probe Software. Kano turns to Bob, Rayden to Eric, Kang to Carl, Scorpion to Peter, Subzero to Gary, Sonya to Fergus and Tsung turns to Eddy. Also the main title list of battles "BATTLE PLAN" turns to "BRITTLE PLUM". One unused fighter name Cage should turn into Jean but never appears in this game.
Source: gamefaqs.com

Mortal Kombat II

(FIX) Fighter auto select (added 29.11.18):
At the "START GAME" menu option, hold Up, then press and hold Start until Fighter selection menu appears. This will activates random Fighter selection. This works for both players in linked mode game.
Source: gamefaqs.com

(GEN) Hidden text (added 29.11.18):
There is a regular Probe Software copyright string in the Sound engine data bank near the end of the ROM:

(C)Probe.

Source: tcrf.net

Mortal Kombat 3

(GEN) Fighter auto select (added 29.11.18):
At the Fighter selection screen, hold Up and press Start to activate auto Fighter selection.

(GEN) Secret passwords (added 29.11.18):
After the VS screen there is a special screen where you may enter a special codes to enable a corresponding effect to the next fight. Some codes does nothing, just displaying some text. There are also four dummy codes that doesn't even display anything so you just couldn't say they are work. Believe me they does but they are useless.

Idx	\|	Code	\|	Message	\|	Effect
01	\|	100-100	\|	THROWING DISABLED	\|	No throws.
02	\|	020-020	\|	BLOCKING DISABLED	\|	No blocks.
03	\|	033-000	\|	PLAYER 1 HALF POWER	\|	-
04	\|	000-033	\|	PLAYER 2 HALF POWER	\|	-
05	\|	688-422	\|	DARK KOMBAT	\|	Light up only when kick something.
06	\|	460-460	\|	RANDPER KOMBAT	\|	Randomly change both players during the Fight.
07	\|	987-666	\|	HOLD FLIPPERS DURING CASINO RUN	\|	Message only.
08	\|	707-000	\|	PLAYER 1 QUARTER POWER	\|	-
09	\|	000-707	\|	PLAYER 2 QUARTER POWER	\|	-
0A	\|	642-468	\|	-	\|	Dummy.
0B	\|	969-141	\|	-	\|	Dummy.
0C	\|	033-564	\|	-	\|	Dummy.
0D	\|	769-342	\|	-	\|	Dummy.
0E	\|	282-282	\|	NO FEAR	\|	Message only.
0F	\|	987-123	\|	NO POWERBALLS	\|	No shooting.
10	\|	466-466	\|	UNLIMITED RUN	\|	No run limit.
11	\|	985-125	\|	PSYCHO KOMBAT	\|	Codes 02, 05, 06, 0F in one at the same time.
12	\|	123-926	\|	THERE IS NO KNOWLEDGE THAT IS NO POWER	\|	Message only.
13	\|	205-205	\|	FIGHT SMOKE	\|	Fight with Smoke.
14	\|	192-234	\|	SMOKE ENABLED	\|	Fight as Smoke.

Source: gamefaqs.com

Mouse Trap Hotel

(FIX) Extra 10 lives (added 30.11.18):
At the title screen, press quickly Up, Down, B, Select, Right then press Start to start a new game.
Source: gamefaqs.com

(UNI) Stage select (added 30.11.18):
Hold Up + Right before power the console on, then wait for the License screen appears. After a license screen you'll see an "ELEVATOR" room instead of the title screen where you can select any starting floor except the last one.

(UNI) Debug menu (added 30.11.18):
During the game, press Select to enter Map mode. Input one of the following button sequences to open a corresponding debug menu.

Up, Down, Right, Up, Down, Left, B, Up, B, Down	-	Simple debug menu. Select invincibility, max out lives, Stage select with floor 5 available, start at bonus room.
Up, Down, Right, Start, Up, Down, Left, B, Up, B, Down	-	Complex debug menu. All options of the simple mode, plus much more debug functionality.

(BUR) Hidden text (added 30.11.18):
There is a hidden copyright string at the beginning of the ROM:

(c) 1990 Milton Bradley by Mark D. Klein 06-11-90

Source: tcrf.net

Mr. Nutz

(GEN) Secret passwords (added 30.11.18):

NESTOR

Stage skip. During the game press Select + Start.

Source: gamefaqs.com

(BUR) Hidden text (added 30.11.18):
There is a build date string near the beginning of the ROM:

MR NUTZ 28 SEPTEMBER 1994

Mysterium

(GEN) Debug cheats (added 01.12.18):
Start a new game, press Select to open "INVENTORY", then select "MAP". Press one of the following button codes to get a corresponding effect.

A + B + Left + Start	-	Insert a special debug item "PASS KEY" to the inventory. May be used for open any door. Also can be transformed to other debug items when used with any Pool: "DOWNLEVL", "UPLEVEL" and "SUPERPOW" which allows you to go down to the lower/upper floors or grants an invincibility correspondingly.
Select + B + Up	-	Fills the inventory with a sequential set of items starting from currently posessed item in the first slot. May be used to list all possible items in the game.
Select + B + Down	-	Doest the same as "DOWNLEVL" item, instantly skips to the lower floor.

Source: gamefaqs.com

Mystical Ninja Starring Goemon (USA), Ganbare Goemon: Kurofunetou no Nazo (Japan)

(BUR) Game genie (added 27.04.17):

011‑F7E‑E6A (for the US version only)

Re-enables some debug features. At the Map screen, press Up/Down to change starting location, press A to continue (delay is disabled). During the game, press A + B + Select to skip the stage instantly. The Japanese version has all the same routines, but there are no variable initialization to hack, but you still can modyfy the RAM address $C067 to any non-zero value to enable them. Also, the stage skip cheat there is different: A + B + Start

Nada Asatarou & Kojima Takeo no Jissen Mahjong Kyoushitsu

(UNI) Cart RAM clear (added 15.09.17):
In addition to the generic soft-reset button code (A + B + Select + Start), hold Up to not only to reset the console but to clear the saved game data as well.

(UNI) Forbidden names (added 15.09.17):
This game has a hidden check for the name you enter in the Tournament mode. If it match with one of the words, then it will be replaced to another one rather less obscure i think. The full list of replacements in the table below.

Forbidden name	-	Replacement
"ああああ" (generic "lazy" name)	-	"あなた" (literally "you")
"　　　　" (all spaces)	-	"ひろきゅ" (-)
"おまんこ" ("pussy")	-	"すけべ" ("lecher")
"せっくす" ("sex")	-	"えっち‥" ("pervert")

Nakajima Satoru: F-1 Hero GB - World Championship '91

(UNI) Password generator (added 29.03.17):
Note, that there are no passwords given to you by the game after completing Level 8, but the password generation system supports level numbers up to 9, which renders as a special secret case to see an instant ending.

Nangoku Shounen Papuwa-kun: Ganmadan no Yabou

(GEN) Secret passwords (added 10.11.19):

いかす？

Stage select.

Source: makainyumon.web.fc2.com

Navy Blue '90

(UNI) 2 Players mode cheats (added 10.11.19):
When two GameBoys connected via link cable, power on both of them, then while "GAMEBOY" logo is on the screen, on either of them hold Right + Select, then one of the following combinations to have a corresponding effect when playing a "2 PLAYERS" mode. A corresponding message will be displayed at the top corner of mode selection screen.

A	-	"OONANI OFF". Disables the "Ship is near" indication when hitting an empty cell.
B	-	"TIMER OFF". Disables the countdown timer during player move.
A + B	-	Both effects at the same time.

(BUR) Game genie (added 10.11.19):

1E1‑EFF‑C4A

Re-enables the SAMPLE version advertising message before the title screen.

Navy Blue '98

(UNI) 2 Players mode cheats (added 11.11.19):
When two GameBoys connected via link cable, power on both of them, then while "GAMEBOY" logo is on the screen, on either of them hold Right + Select, then one of the following combinations to have a corresponding effect when playing a "2 PLAYERS" mode. A corresponding message will be displayed at the top corner of mode selection screen.

A	-	"OONANI OFF". Disables the "Ship is near" indication when hitting an empty cell.
B	-	"TIMER OFF". Disables the countdown timer during player move.
A + B	-	Both effects at the same time.

NBA Jam

(FIX) Power up cheats (added 12.11.19):
At the Match-up screen, press either A or B for a corresponding number of times, then press and hold one or two more buttons according to the following table then wait to get a particular "POWER UP" bonus for the current match.

First, Press	\|	then, Press and Hold	\|	Power Up
5 times	\|	Up	\|	Defence
15 times	\|	Right	\|	Intercept
3 times	\|	B then Up	\|	Show Shot
14 or more times	\|	B then Up	\|	Turbo
10 times	\|	A then Down	\|	Dunks
7 times	\|	Left	\|	Fire
14 times	\|	A then B	\|	Juice Mode (this mode is also unlockable after beating a game)

Source: gamefaqs.com

(GEN) Secret characters (added 12.11.19):
At the Initials input screen, input first two letters of the desired name. Then put cursor to the corresponding letter from the table. Press and hold direction button corresponding to this initials and finally press following button code. If done right, you'll start a game with a custom selected character instantly skipping a password entry.

First, input	\|	then put on Letter	\|	then Hold	\|	and Press	\|	Initials Must be	\|	Character
"WI"	\|	"M"	\|	Left	\|	B	\|	"WIL"	\|	Turmell
"SD"	\|	"T"	\|	Down	\|	B	\|	"SD "	\|	Divita
"JA"	\|	"T"	\|	Up	\|	B	\|	"JAM"	\|	Air Dog
"MA"	\|	"U"	\|	Up	\|	Start + A + B	\|	"MAN"	\|	Weasel
"FN"	\|	"L"	\|	Left	\|	B	\|	"FNK"	\|	G.Clinton
"VI"	\|	"J"	\|	Right	\|	A + B	\|	"VIK"	\|	Moon
"EX"	\|	"J"	\|	Up	\|	Start + B	\|	"EXC"	\|	Al Gore
"US"	\|	"B"	\|	Left	\|	A + B	\|	"USA"	\|	Bill Clinton
"FR"	\|	"E"	\|	Left	\|	B	\|	"FRD"	\|	Kabuki
"BA"	\|	" "	\|	Up	\|	A + B	\|	"BAT"	\|	Brutaw
"AM"	\|	"Q"	\|	Down	\|	A + B	\|	"AMX"	\|	Chow Chow
"RJ"	\|	"F"	\|	Up	\|	A + B	\|	"RJ "	\|	Rivett

Source: gamefaqs.com

NBA Jam: Tournament Edition

(UNI) Team swap (added 17.11.19):
At the player's "SUBSTITUTION" screen between quarter-rounds, hold A + Up for a couple of seconds until message "TEAM SWAP" appears. Now press Left/Right to change the current player's team.

(FIX) Match-up cheats (added 17.11.19):
All codes must be entered at the Match-up screen before the game. Press Start to apply the code. A sound will confirm code acceptance.

Code	\|	Message	\|	Effect	\|	Note
Up, Up, Down, Down, B	\|	"SHOT %"	\|	Shot Percentage Display	\|	-
Left, Left, Left, Left, A, Right	\|	"QUICK HND"	\|	Easy Steals	\|	-
Right, Right, Left, Right, B, B, Right	\|	"MAX PWR"	\|	Maximum Power	\|	-
Right, Up, Down, Right, Down, Up	\|	"GOALTEND"	\|	Goal Trending Power-up	\|	-
Down, Right, Right, B, A, Left	\|	"FIRE"	\|	Always on Fire	\|	-
B, B, B, A, Down, Down, Up, Left	\|	"TURBO"	\|	Infinite Turbo	\|	-
A, B, Up, A, B, Up, Down	\|	"OFFENCE"	\|	Offence Power-up	\|	-
Up, Down, Left, Right, Left, Down, Up	\|	"3 PT"	\|	3 Pointers Power-up	\|	-
Left, Right, A, B, B, A	\|	"ULTRA JAM"	\|	Dunks Power-up	\|	-
Down, Right, A, B, A, Right, Down	\|	"PUSH"	\|	Defence Power-up, Easy Blocks	\|	-
Up, Up, Up, Up, Left, Left, Left, Left, A, A	\|	"PUSH"	\|	Knock Down Opponent	\|	Missing on gamefaqs.com
Up, Up, Up, Up, Left, Left, Left, Left, A, B	\|	"PUSH"	\|	Knock Down Team-mate	\|	Missing on gamefaqs.com
Up, Right, Right, Left, A, Down, Left, Left, Right, B	\|	-	\|	Teleporting Passes	\|	Missing on gamefaqs.com
A, A, A, A, A, Right, Right, Right, Right, Right	\|	-	\|	Slippery Court Mode	\|	-
Up, Down, Up, Down, Right, Up, A, A, A, A, Down	\|	-	\|	High Shots	\|	-

Source: gamefaqs.com

(GEN) Secret characters (added 17.11.19):
In order to play with one of the secret characters you not only must enter its initials before the password screen, but for every letter you must use a corresponding button to input it. There are three buttons used for input secret initials: A, B and Start. Use the table below to activate the particular character.

Initials	\|	1st Letter	\|	2nd Letter	\|	3rd Letter	\|	Character
"CIC"	\|	B	\|	A	\|	A	\|	"B CLINTON"
"HC "	\|	A	\|	A	\|	Start	\|	"H CLINTON"
"GOR"	\|	A	\|	Start	\|	A	\|	"SUNS GORILLA"
"HVY"	\|	Start	\|	B	\|	B	\|	"HEAVY D"
"JAZ"	\|	A	\|	Start	\|	Start	\|	"JAZZY JEFF"
"WIL"	\|	Start	\|	A	\|	B	\|	"FRESH PRINCE"
"SOX"	\|	A	\|	Start	\|	Start	\|	"THOMAS"
"PHI"	\|	B	\|	Start	\|	A	\|	"CUNNINGHAM"
"BRD"	\|	Start	\|	Start	\|	A	\|	"BIRD"
"MKD"	\|	A	\|	B	\|	Start	\|	"MIKED"
"ADR"	\|	Start	\|	A	\|	B	\|	"ADROCK"
"MCA"	\|	Start	\|	B	\|	A	\|	"MCA"
"RPR"	\|	B	\|	Start	\|	A	\|	"RP RODENT"
"CRN"	\|	Start	\|	Start	\|	B	\|	"CRUNCH"

Source: gamefaqs.com

(BUR) Game genie (added 17.11.19):

6B1‑9DF‑5D3

Re-enable the in-game memory viewer. During the game, press Select, then A + B to access it. Use D-pad buttons to change current RAM address or press Select to see current CHR data tiles.

Nectaris GB

(GEN) Quick start mode (added 14.05.17):
This mode is unlockable. When you complete all Story and all Legend modes, the "QUICK START" option will appear in the game's "MAIN MENU". This option allows you to play any both Story and Legend maps either in 1PLAYER or 2PLAYER (on the same GB console in turns) modes. Also, you can choose here to play as "GUICY" instead of "UNION" on the same regular maps, just like in the PCE version.

(GEN) Secret passwords (added 14.05.17):
Note, two secret sets of passwords enables the Advanced maps for both regular game modes. All passwords here are just regular passwords for the corresponding maps written backwards. Also, there is a set of 44 secret passwords for every Campaign Mode maps available in GB version: "EMAPxx", where "xx" is a map number from 01 to 44 (last four corresponds to the "SPWinners" maps), but since they can be accessed at any time from the "Campaign maps" menu, they are actually don't needed.

	-	Story Maps Advanced (GB Exclusive)
NEVETS	-	Map 01
LARTSA	-	Map 02
ELKCEH	-	Map 03
GNIMER	-	Map 04
REYETS	-	Map 05
EHTLAW	-	Map 06
TUBMUN	-	Map 07
FATSUG	-	Map 08
CIDRAD	-	Map 09
ELLSEK	-	Map 10
YNWORB	-	Map 11
OTEREB	-	Map 12
RENERG	-	Map 13
TREGER	-	Map 14
AMALAS	-	Map 15
TCENOZ	-	Map 16
	-	Legend Maps Advanced (PCE Campaign)
TLOVER	-	Map 01
SURACI	-	Map 02
ONARYC	-	Map 03
YESMAR	-	Map 04
NOTWEN	-	Map 05
ACENES	-	Map 06
ENIBAS	-	Map 07
SUTARA	-	Map 08
SIOLAG	-	Map 09
NIWRAD	-	Map 10
LACSAP	-	Map 11
YELLAH	-	Map 12
NAMROB	-	Map 13
OLOPPA	-	Map 14
RESIAK	-	Map 15
ROTCEN	-	Map 16

Source: nectaris.tg-16.com

Nemesis (Single game cart), Gradius (Konami GB Collection Vol.1)

(FIX) Pause cheats (added 19.11.19):
Pause the game, enter one of the following codes and then unpause to get a corresponding effects.

Up, Up, Down, Down, Left, Right, Left, Right, B, A	-	S no change; M, L, O, F max; D default, available; once per game.
B, B, B, B, B, A, A, A, A, A	-	S, F max; M, D, L, O default, available; once per game.
Up, Right, Down, Left, Up, Right, Down, Left, B, A	-	S, M, D, L, O, F no change; destroy all, once per game.
A, Left, A, Left, A, Left, A, Left, A, Left	-	S, M, D, L, O, F default, available; once per game.
Up, Select, Down, Select, Left, Select, Right, Select, Select, Select	-	S, M, D, L, O, F default, not available; no use limits.

Source: gamefaqs.com

Nettou Real Bout Garou Densetsu Special

(GEN) Frame advance (added 13.12.19):
Pause the game during fight, press Select to advance the animations frame by frame.

(FIX) Soft DIP switches (added 13.12.19):
At the "OPTION" menu, put cursor to "SOUND TEST", hold Left and press A. The new option "SOFT DIP" will appear at the sound test menu. Set "1" to activate the corresponding flag, or "0" to deactivate them. Only four of them are usable, the rest dows nothing here. Full list of effects in the table below. This cheat is revealed after the ending credits when you beat the game on "HARD" difficult.

10000000 (bit 7)	-	Unlocks two secret characters "IORI" and "GEEZE". This dip also activated automatically when you beat the game on "NORMAL" mode. Also game will show you the hint screen how to switch to those characters at the fighter select screen.
00001000 (bit 3)	-	Slow down power meter.
00000100 (bit 2)	-	Enables shortcuts for a Special Moves of a selected fighter. You don't have to enter the full button sequences nor be close to the opponent to use them. Just press either Select + A or Select + B to automatically use one of Special Moves. Special moves may be different while used mid-air.
00000001 (bit 0)	-	Enables third invisible option at "GAME MODE" screen. Chose it to see how two CPUs will pick a random fighters and fight each other automatically. Additionally, before selecting this mode, hold Left + B. This clears the random generator to make the predetermined fighters selection.

Source: gamefaqs.com, tcrf.net, unlockable

(UNI) CPU controlled player (added 13.12.19):
At the "GAME MODE" screen, before selecting the "1 PLAY MODE" hold B. This make your fighter to be CPU controlled. But you still have to choose both characters at the fighters selection menu.

(BUR) Game genie (added 13.12.19):

003‑2DB‑C4D

Re-enables the debug frame advance for VS animations. The animations does not run unless you press Select.

007‑4E9‑C4D

Re-enables set of cheats for the "TAKARA" logo screen. Cheats very similar to those used in "The King of Fighters '95". But some of activated bits not used in this game. Also "SOFT DIP" cheat make these cheats redundant so maybe they were disabled because of that.

Hold A + B, press Select 1 time.	-	bits 3, 5 set (bit 3 used, see above).
Press Select 3 times.	-	bit 6 set (unused).
Press Select 20 times.	-	bit 7 set (used, see above).
Hold Left + A + B, press Select 30 times.	-	bits 2, 4 set (bit 2 used, see above).

Nettou Garou Densetsu 2: Aratanaru Tatakai

(GEN) Sound test (added 14.12.19):
At the Mode Select screen, choose either the "STORY" or "VS" modes, hold Select, then press Start.
Source: urawaza.in

(GEN) Unlock characters (added 14.12.19):
At the Takara logo screen, press Select, Select, Select. A sound will be heard. Now all hidden bossess are playable. This code is revealed after you beat the game on HARD mode.
Source: urawaza.in, unlockable

(BUR) Game genie (added 14.12.19):

00D‑83A‑D5A

Re-enables debug menu. At game boot, hold any D-Pad button and wait. Press A/B to enable or disable options correspondingly. Press Start to continue to play. Any enabled debug flags also activates the Soft Reset button code (Select + Start). Additionally in "VS MODE" via Link Cable during fighting sequences this activates a lot of debugging information display on the game's HUD. The options functions are follows. Unused options although does nothing, may be used for enabling a global debugging functions without using any other working flags.

0.MAIN CURSOR	-	During fighting sequences activates the CPU-meter at the bottom-right corner of the screen.
1.MUGEN TIMER	-	Set timer to Infinity. However, not force it, you still can change this option manually.
2.MUTEKI	-	Infinite health for both fighters.
3.HIT BREAK	-	When fighters hit each other, the game will stop unless you press Start to continue.
4.COM VS COM	-	Both players are CPU-controlled.
5.	-	Does nothing.
6.	-	Does nothing.
7.DEBUG MODE	-	Does nothing.

Source: tcrf.net

F5D‑3BA‑A2D

Re-enables unfinished "BATTLE ROYAL" mode at the Mode selection menu. Choose sequence of 7 characters, then fight with them in VS MODE. The second player does not controlled properly not with Link cable not in SGB modes. Also characters selection screen somehow broken.

3F2‑B3D‑A2F

Replace the Takara logo screen with rather unused "BEST PLAYERS" ranking screen. The used ranking screen for "VS MODE" looks little bit different. This one seems intended to be used in attract mode.

452‑B3D‑A2F

Replace the Takara logo screen with rather unused "NAME ENTRY" screen. You can only see it if score higher than 20000 pts in current game. To see it instantly, use additional Game genie code 003‑ED8‑D5A. The screen is also rather unfinished and does not work properly. Also note, in this mode the characters has its Last names not mentioned anywhere else in the game.

Nettou Samurai Spirits: Zankurou Musouken

(UNI) Takara logo cheats (added 19.09.20):
At the "TAKARA" logo, input one of the following sequences. A sound will confirm correct code entry.

Select, Select, Select	-	Unlock two playable characters. Source: gamefaqs.com
A, Up, B, Left, A, Down, B, Right	-	Cutscene play mode. Start a new "1 PLAYER" game, choose a fighter, then instead of battle watch its intro and ending cutscenes. Source: gamefaqs.com
Up, Up, Up, A, Down, Down, Down, B	-	Only for Super Game Boy mode. Fast game. No frame delays, faster movements.

(BUR) Game genie (added 19.09.20):

0B3‑DAE‑E6A

Re-enables the Message Viewer, intended to be accessible via cheat code at the "TAKARA" logo, as in "World Heroes 2 Jet" but for some reason unimplemented here.

Source: tcrf.net

Nichibutsu Mahjong: Yoshimoto Gekijou

(GEN) Custom tiles distribution (added 20.09.20):
At the Dice roll screen, just before the game starts, hold Up and wait. Instead of random tiles distribution you'll be given one of 25 pre-defined tile sets which is little easier to play with. This does not work in VS mode.
Source: urawaza.in

Nick Faldo Championship Golf (Prototype)

(UNI) Weird debug cheat (added 29.12.21):
At the title screen with Nick Faldo input Down, Down, Down, Right, Down, Down, Up, Right. Now with A or B input sequence of the binary numbers, 16 in row. This will be the RAW CPU address space address to jump when you finish. Obviously, if you don't know where to jump you just crash the program.

(BUR) Game genie (added 29.12.21):

F71‑C0F‑E63

Re-enables disabled developer's copyright screen instead of TITUS license screen (with telephone number!).

(BUR) Hidden text (added 29.12.21):
At 0x563 in ROM there is a string to initialize RAM at start:

TUTUS

I don't know wether it is a misspellet "TITUS" or not.

Nikkan Berutomo Club

(UNI) Cheat sequences (added 08.07.16):
All cheats entered at the title screen and has effect during the gameplay. Enter one of the following sequences and either start a new game or continue previously saved one. You may notice if cheat is working (except fot the first one, see below), in the main display header, day of the week will be separated with line from the time, otherwise there are no characters between them.

Start, B, Start, Select, B, B, Select, Start	-	Add all friends to list instantly at the game start. After all friends are added, the cheat flag is set to zero and does no extra functions or indications.
Select, Select, B, Start, Start, B, Select, Start	-	At the main game menu, hold Down, then press Select to enter the Sound test.
B, Start, B, Start, Select, B, B, Start	-	This is most powerful debug cheat here. First, any time during the game, hold Select + Start to skip 2 minutes of time every second. At the Main game menu, hold Down, then press Select to enter the debug menu. Here you can select some of game events, including ending and staff displays, sound test and debug memory viewer. At the Friends list, hold Select or Start, then press Up/Down to increase/decrease the friendship level correspondingly. A number under the friend's face will indicate the friendship level. If there is no friend at the selected position, it will be added.

Ninja Boy (USA), Super Chinese Land (Japan)

(GEN) Continue (added 26.09.20):
After Game Over, at the title screen, hold A then press Start to continue from substage 1 of the last played stage. Stage increased every 4 substages so you need to beat at least 4 substages before you able to use the continues.
Source: urawaza.in

(FIX) Title screen cheats (added 26.09.20):
Techincally, this game check for the same long cheat sequence, but effect is different based on how much buttons is matched. Input one of the following sequences at the title screen then press Start to get corresponding effect.

Up, Up, Down, Down, A	-	Simple stage select. Use D-Pad buttons to select stage/substage number.
Up, Up, Down, Down, A, B, A	-	Same as previous, but also you'll get 9 lives, 9 "M"'s, 5 "hammers", 99 "K"'s and as much items and "POWER" as greater your stage number.
Up, Up, Down, Down, A, B, A, B, A	-	Same as previous, but you'll get 80 lives instead.
Up, Up, Down, Down, A, B, A, B, A, A, B	-	The ending sequence.

Source: classicgamehacking.com

Ninja Boy 2 (USA), Super Chinese Land 2 (Japan), Nintama Rantarou (Japan Rerelease)

(UNI) Warp passwords (added 27.09.20):
In order to use warp passwords, first, input any invalid password (or empty one) to get the "WRONG PASSWORD!" message. Input one of the following passwords and press "END". If done right, the message "WRONG PASSWORD!" will be displayed again instead of "SORRY. TRY OLD ONE". Press "END" one more time to activate currently selected warp password. With these passwords you will start from one of the game locations with predefined set of money/items and stats corresponding to selected stage. Note, for the Rerelease version locations and its names are different.

US	\|	Japan	\|	Rerelease	\|	Location
JW	\|	けつ	\|	あほ	\|	DESERT STAR
CH	\|	えへ	\|	いぬ	\|	DINOSTAR
RV	\|	むち	\|	うめ	\|	MECHA COLONY
KG	\|	ほい	\|	えと	\|	FANTALAND
DN	\|	おす	\|	おの	\|	WOOD WORLD
SB	\|	いか	\|	かま	\|	WATER WORLD 1
LX	\|	たこ	\|	きね	\|	WATER WORLD 2
TR	\|	のあ	\|	くに	\|	YUKIMURA
MZ	\|	しし	\|	けむ	\|	KING'S PLANET

(FIX) Debug passwords (added 27.09.20):

US	\|	Japan	\|	Rerelease	\|	Effect
FL9	\|	こいつはつええ	\|	さあこい	\|	Start with lots of money and items. Only for original releases press Start + Select (or Select for 2-player mode) to select and instantly jump to any location.
MX9	\|	つええ	\|	まかしとき	\|	Start with lots of EXP and MAX stats. Location select mentioned above also accessible here, but not for Rerelease version.
♪♪♪	\|	きくみみもつ	\|	-	\|	Music test.
MS9	\|	はなす	\|	おはなし	\|	NPC Message test.
🞧ND	\|	おけつ	\|	おけつ	\|	Ending sequence.
MG9	\|	ひみつ	\|	ひみつ	\|	Cutscene viewer.
MD9	\|	はかせ	\|	しねま	\|	Another Cutscene viewer.
SP9	\|	かいもの	\|	かいもの	\|	Shop test.
RD9	\|	のせて	\|	のせて	\|	Animal rides test.
HL9	\|	したい	\|	したい	\|	Hotel test.
CV9	\|	おそい	\|	おそい	\|	Convenience store test.
SD9	\|	みせて	\|	みせて	\|	Ingame menu test.
PS9	\|	みたな	\|	みたな	\|	Password input test.
WD9	\|	みせな	\|	みせな	\|	Password generator test.
BT9	\|	たたかう	\|	たたかう	\|	Boss battle test (not working)
1P1P99	\|	あいなめ	\|	あいなめ	\|	Force 2-player mode on the same console. Enter any valid or debug or warp password to start a game. Press Select to switch players. Hold D-Pad then press Select to make the another player to auto-move in selected direction.

Source: tcrf.net, FlyingOmelette

(BUR) Game genie (added 04.10.20):

3CC‑089‑C47+3CC‑0A9‑C47

Re-enables the disabled "MUSIC TEST" password in Rerelease version of the game. Use these codes, then input "のののの" as password.

Ninja Gaiden Shadow (USA), Shadow Warriors (Europe), Ninja Ryuukenden: Matenrou Kessen (Japan)

(GEN) Sound test (added 28.09.2020):
At the title screen, hold A + B, press Start.
Source: gamefaqs.com

(UNI) Stage select (added 28.09.2020):
At the title screen, hold Select, then press A, A, A, A, B, B, B, B, A, B, A, B, A, B, A, B.

(BUR) Game genie (added 28.09.2020):

08D‑D8A‑C46	-	Use this code then at the title screen use the "Sound test" cheat to access a powerful debug mode instead. Note, options "BANK TEST" and "VISUAL TEST" are exactly the same.
08D‑81A‑D5A	-	Use this code then at the title screen wait until the demo starts. The numbers appears at the middle of the screen instead. Use A/B to change it, then press Start to start from any stage/substage or see the ending (number 03).

Source: tcrf.net

Ninku

(GEN) Secret characters (added 01.10.20):
At the player selection screen in "TAISEN" game either in "1P" or "VS" modes press buttons as described below. Buttons may be entered in any order. When done, press Select to activate the Secret character if correct amount of buttons is pressed. If code is incorrect, this will reset the counters and you need to re-enter the code again. Note, in "VS" mode, the second player also able to activate same characters as well.

Up 2 times, Down 9 times	-	Pochi the dog
Up 9 times, Down 2 times	-	Youkou aka Kurenai

Source: urawaza.im, gamefaqs.com

(BUR) Game genie (added 01.10.20):

203‑9CF‑80A	-	Re-enables the "DEBUG MODE". Any time during the game, hold A + B then press Select to enter.
004‑459‑C4D+0E4‑B09‑F7E	-	Re-enables the 4th option "SP EDIT", similar to "STATUS EDIT" but different.

Source: tcrf

Ninku Dai-2-dan: Ninku Sensou Hen

(GEN) Easter egg (added 03.10.20):
At the title screen, enter "OPTION" (third menu option). Select "OMAKE" and play a dice game. If you score more than 30 pts the Rihoko character will switch to Toujiko character. When playing a music, his ass cheeks will twitch. Play again a dice game to score above previous record to make Tujiko to run at the title screen as well.
Source: urawaza.in

(BUR) Game genie (added 03.10.20):

200‑64E‑80A

Re-enables debug menu. Any time during the game, hold A + B then press Select to activate it. Note, the fourth option does not exists here anymore, the third option "GOTO PROGRAM" will be executed instead.

Source: tcrf.net

Nintama Rantarou: Eawase Challenge Puzzle GB

(UNI) Extra 99 lives (added 05.10.20):
At "OPTIONS" screen, put cursor to "にんずう" ("HOW MANY PEOPLE", a lives counter) option and press Select 21 times. Now you'll be able to select amount of lives up to 99, instead of max 6 by default.

(FIX) Ura puzzle mode (added 04.10.20):
After power up, quickly press Start to skip intro with copyrights before any text appear on the screen. When "PUSH START" message is displayed, press Up 21 times, Right 18 times, then A. Note, if you wait too long at the intro, the internal counter gets a wrong number and you need to mash some buttons before entering the actual code to reset it to a normal state. It may be tricky. To disable it back, press Down 21 times, Left 18 times, then A instead. WHen done right, a sound will be heard, also the title will change to "URA PUZZLE". Main differences of the "URA PUZZLE" mode is there an additional playable character, the whole set information seals are available, including one extra printable puzzle seals set, a different stage behaviours and quests. "URA PUZZLE" mode activated instantly after you beat the game with good ending whith all items collected. The special activation cheat for the title screen is written on the most rare seal information card which is given to you with the according item. The disactivation code is unobtainable in the game.
Source: unlockable

(GEN) Secret passwords (added 05.10.20):
Enter as a password any of following numbers at the Character selection screen to obtain one of the Equipement items instantly. These passwords are unlockable and given to you when you obtain two Seals 144 and 145 in a Slot game in "URA PUZZLE" mode (see below).

1414	-	Super Gauntlet
1723	-	Super Shuriken
2236	-	Super Hammer
8823	-	Shinobi Sword

(FIX) Collectible Seals (added 05.10.20):
During the game, you obtain some random collectible "SEALS". Most of them have a pictures with a text that may be printed out on the Game Boy printer. Every Seal has an unique 4-character code which you may input at the "OPTIONS" screen to see or print it again. When you input any Seal code at the Options screen, corresponding Seal is adding to your library, so no need to input it again. Here is the complete list of all possible collectible codes, including a secret ones.

000 "KUJI"	-	Displays 17 short messages from developers. Press A to see next one. Secret one, cannot be obtained in any part of the game. Not-printable.
001 "STOM" 002 "EAKA" 003 "IIUS" 004 "SHDH" 005 "EEEI" 006 "KNKT" 007 "IYIA" 008 "FSDA" 009 "UEEN" 010 "TISI" 011 "USUU" 012 "UESE" 013 "NKAW" 014 "OIRO" 015 "MSAY" 016 "OHRO" 017 "UIIU" 018 "SGMC" 019 "UAAC" 020 "KNSC" 021 "OBHC"	-	Three sets of IQ results screens for every character. Unobtainable in Slot game. Unlocked only with Seals 151 and 152 (see below), which is in its way revealed in Seal 44.
022 "TABI" 023 "FZIN" 024 "IDAT" 025 "NAWA" 026 "HEBK" 027 "RYUK" 028 "MAIL" 029 "ARMR" 030 "CLOS" 031 "SNAT" 032 "KAIT" 033 "BOMB" 034 "HART" 035 "KTNA" 036 "CULB" 037 "HNMR" 038 "SUPD" 039 "SYRK" 040 "DATA" 041 "GANT" 042 "SLSC"	-	Set of regular obtainable Seals for every single item. Obtainable in Slot game or with corresponding item during the game.
043 "OMTE" 044 "URRA"	-	Two secret Seals obtainable only with corresponding items during the game. Both required for unlocking the "URA PUZZLE" game mode (see above). The first one also reveals the title screen cheat, the second one reveals set of Seals 152-156 which is in its turn instantly unlocks Seals 001 to 082.
045 "SRBA" 046 "MDLE"	-	Two seals for items not corresponding to any stage. Obtainable only in Slot game.
047 "HDOI" 048 "UZUM" 049 "NTOU" 050 "ZENI" 051 "KANE" 052 "SCRL" 053 "NIIN" 054 "SYOK" 055 "SYUR" 056 "SIOS" 057 "BBBA" 058 "WAKA" 059 "YUTO" 060 "YAMA" 061 "OHOH" 062 "RTNR" 063 "RMRK" 064 "EBNS" 065 "KYKY" 066 "IMMT" 067 "GSGS" 068 "MHMH" 069 "NRKS" 070 "IAIH" 071 "NNRI" 072 "TTIN" 073 "AAMB" 074 "MRAE" 075 "AORE" 076 "YTUN" 077 "UUNI" 078 "ANON" 079 "ROEJ" 080 "UBNY" 081 "DISU" 082 "AJYT"	-	Various information seals with character's and items' trivia. Only obtainable in Slot game.
083 "GUIT" 084 "AAHY" 085 "NTAO" 086 "BUMU" 087 "AMIR" 088 "TETE" 089 "TYUA" 090 "EOKS" 091 "ZUTI" 092 "EKAI" 093 "NIKR" 094 "BMAU"	-	Puzzle 1 tiles. Obtainable only in Slot game but in both Normal and "URA PUZZLE" modes.
095 "QNVX" 096 "WMBC" 097 "EQNV" 098 "RWMB" 099 "TEQN" 100 "YRWM" 101 "UTEQ" 102 "IYRW" 103 "QUTE" 104 "PIYR" 105 "AOUT" 106 "SPIY" 107 "DAOU" 108 "FSPI" 109 "GDAO" 110 "HFSP" 111 "JGDA" 112 "KHFS" 113 "LJGD" 114 "ZKHF" 115 "XLJG" 116 "CZKH" 117 "VXLJ" 118 "BCZK"	-	Puzzle 2 tiles. Obtainable only in Slot game and only in Normal Puzzle mode.
119 "QPLO" 120 "AQPL" 121 "ZAQP" 122 "WZAQ" 123 "SWZA" 124 "XSWZ" 125 "EXSW" 126 "DEXS" 127 "CDEX" 127 "RCDE" 129 "FRCD" 130 "VFRC" 131 "TVFR" 132 "GTVF" 133 "BGTV" 134 "YBGT" 135 "HYBG" 136 "NHYB" 137 "UNHY" 138 "JUNH" 139 "MJUN" 140 "IMJU" 141 "KIMJ" 142 "OKIM" 143 "LOKI"	-	Puzzle 3 tiles. Obtainable only in Slot game and only in "URA PUZZLE" mode.
144 "TEND" 145 "TWIN" 146 "CRIT" 146 "UENU" 148 "LBCR" 149 "TRUE"	-	Secret Seals obtainable only in Slot game on the "URA PUZZLE" mode. First two reveals four secret passwords to instantly obtain a particular item at the beginning of the game (see above). The rest one, surprisingly, reveals some of secret codes to obtain some items and characters in another Culture Brain game for N64 which have similar unlockables system: Hiryu no Ken Twin (Flying Dragon).
150 "UALB"	-	Another Seal revealing more codes for N64 Flying Dragon but not included in the list obtainable in Slot game because of bug. As a result this Seal is completely unobtainable during the game.
151 "ZEEN"	-	Secret Seal, unobtainable during the game. Unlocks all Seals from 001 to 150. See, it includes Seal 150 mentioned above. Not printable.
152 "SEKI" 153 "ITEM" 154 "CUBE" 155 "WINS" 156 "ININ"	-	Set of hidden Seals revealed by the Seal 044. Each Seal unlocks instantly a portion or Seals from 001 to 082 divided into 5 sets. Not printable.
157 "PAZA" 158 "PAZB" 159 "PAZC"	-	Finally, three more Secret Seals unobtainable in the game. Same as previous onw, but unlocks more Seals instantly up to 143. Not printable.

NIV Holy Bible, The (Wisdon Tree, Unlicensed)

(GEN) Word Match Game Level select (added 18.11.18):
At the Word Match Game Title screen, hold Up, then press Select to increase starting game level.

(UNI) Checksum test (added 18.11.18):
At the main menu, press Left 8 times. A sound informs you when checksumming started and finished. Since this is a leftover from the original version of this cartridge "King James Bible", the checksum is displayed at the same place but there are no ROM version anymore, so it overwrites some random text.

Noobow

(GEN) Secret passwords (added 16.10.20):
At the title screen, select "CONTINUE" option and enter one of the wollowing pictures as password.

Angel, Bird, Mole, Crow	-	Stage select. When stage selected with the Stage select is completed, the game will return back to the Stage select screen.
Crow, Mole, Angel, Bird	-	Sound test.

Source: urawaza.in

Oddworld Adventures

(GEN) Samples test (added 18.10.20):
During the game, on pause screen, press any other button than Start to play a corresponding sound sample. Need to mention, that some of these samples aren't used in game actually. Samples like "Follow me" or "Bye Bye", "I don't know" were used in PC version, but in GB port they aren't implemented such features where they were used.

(BUR) Game genie (added 18.10.20):

58D‑3FE‑7F2+48D‑40E‑80B	-	Replace sample on A button at Pause to unused alt version of "Follow me" sample.
9CD‑4DE‑E6A+60D‑4EE‑E6B	-	Replace sample on B button at Pause to unused "Wait" sample.
A8D‑8BE‑3B9+68D‑8CE‑B33	-	Replace sample on Select button at Pause to unused "Robot sound" sample.

Oni III: Kuro no Hakaishin

(GEN) Sound test (added 21.10.20):
Complete the game, watch the ending. At final ending screen with "BANPRESTO" on it, hold Select, then press A, B, Start. Two numbers at the top-left corner of the screen represents the music and the sound indexes.
Source: urawaza.in

Oni IV: Kijin no Ketsuzoku

(BUR) Game genie (added 21.10.20):

CDF‑55D‑C4D

Re-enable the in-game debug menu. During the game, press A to enter the in-game menu, then press Start to enter the debug menu. Note, map select options does not work correctly, you may change the map, bu you couldn't move in it because of wrong starting point. At least you may disable random encounters here and listen to the music and sounds.

Onigashima Pachinkoten

(UNI) Ingame passwords (added 31.10.20):
Start any pachinko machine game then press one of the button sequences below. If done right, the sound will be heard. Cheats may be disabled if entered twice. Also they may be combined so you may enter as much cheats as you want at once. Same cheat system may be found in many other Pachinko games by COCONUTS.

Start, Up, Up, Down, Down, Right, Left, Right, Left, Up, Up, Down, Down, Right, Left, Right, Left, Start	-	(0) Automatic balls deploy, no need to hold A.
Start, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, Start	-	(1) Does nothing.
Start, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Start	-	(2) Displays the air flow power meter. Disables the screen flash when the ball hit any triggers. Also this forces the gamble game on particular levels to always be won.
Start, Left, Down, Left, Left, Left, Down, Left, Left, Start	-	(3) Does nothing.
Start, A, A, A, A, A, B, B, B, B, B, A, A, A, A, A, B, B, B, B, B, Start	-	(4) Enter the odds values edit mode. There are 5 parameters. The first one is the odds for air flow speed decrease. The lower value, less air power decrease. Four other values are for machine hatches odds.
Start, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, Start	-	(5) Game delay control. Current game speed delay is 2. When using this cheat, press Up to increase delay, press B to set the default speed, press any other button to decrease the delay down to 0 which mean no delay at all.
Start, Up, Right, Up, Right, A, B, A, B, Up, Right, Up, Right, A, B, A, B, Start	-	(6) Press A against any pachinko machine. At the menu, press Start to cycle through all possible machine types. Hold Select then choose "YES" to instant win the machine. Also, disables random distribution of machine difficulties in the rooms.
Start, B, B, Right, Left, B, B, Right, Left, Start	-	(7) Does nothing.

Othello (Japan, Europe), Othello World (Japan Rerelease)

(GEN) Swap players (added 31.10.20):
At the game setup menu or at the game menu during the game, hold Select then press A to swap the white and the black players.

(GEN) Discard moves (added 31.10.20):
During the game, hold Start, press B to disacd last two moves.

(GEN) Discard edits (added 31.10.20):
At the game edit mode, press A + B to reset the table to the initial position.

(BUR) Hidden text (added 31.10.20):
There is a hidden programmer's message at the end of the European original version ROM:

Save the earth! (KANAI Makoto)

Source: tcrf.net

Otogibanashi Taisen

(BUR) Game genie (added 31.10.20):

02A‑B0F‑7F2+29A‑B1F‑2AA

Re-enables the Debug menu after the game boot. You will be able to watch all ingame cutscenes, test sprites and its animations, view whole underworld map, test shop and exit back to the game with it.

Otto's Ottifanten: Baby Bruno's Nightmare (Europe), Adventures of Pinocchio, The (Prototype)

All versions:

(UNI) Secret passwords:

PQLLQ	-	Stage select. Dugint the game, on pause, press Up or Down to change current room number, room 101 is an ending. Unpause to jump to it. In the prototype version this cheat is enabled by default.
ZYDRQ	-	Secret message 1.
RQB1N	-	Secret message 2. This screen is different in prototype. The version of this screen from release used in many other games by the same developers Bit Managers.

Prototype version:

(BUR) Game genie:

201‑F2F‑19F+003‑7CF‑C4D

Re-enables an unused "Electro Brain" logo at start.

Out of Gas

(GEN) Suicide (added 31.10.20):
During the game, hold Select, press Start.

(GEN) Secret passwords (added 31.10.20):

WRHL

Stage select. During the game, hold Up press Select to skip to the next level. Additionally, hold A to skip to the next world.

Source: tcrf.net

Out to Lunch

(UNI) Stage select (added 18.10.20):
At the title menu, hold Select, press Left, Right, Up, Left, Down. After completing any selected stage the game will return to the Stage select screen.

Oyatsu Quiz Mogu Mogu Q

(UNI) Sound test (added 23.02.18):
At the Star-Fish logo, hold Select + A + Left and wait for the Sound test screen appears.

(UNI) Debug mode (added 23.02.18):
At the Star-Fish logo, quickly press Select, Up, Down, A, Left, Start. Similar Debug modes can be found in some other games by the same developer (Starfish). When the screen fades out, a message "DEBUG MODE / DEVELOPMENT STAFF ONLY" will be displayed. Now you can access the debug menu during the game by holding Select at the beginning of some events or while in transition between game screens.
In "DEBUG MENU" you may access the same Sound test as in cheat above, also all quiz tests, setup items, generate a password, watch an ending or toggle on or off the "MUTEKI" mode where you can't loose on any quiz sequence.
There are other debug features:Press Start any time to pause the game instantly.
At the passwords input screen, enter password of all "あ" to instantly return back to the title screen.

Pac-Attack (USA), Pac-Panic (Japan, Europe)

(GEN) Give up a level (added 01.11.20):
During the game, press Select + Start to give up the current level. In PUZZLE mode there will be options to retry or end the game. For NORMAL mode you just give an instant Game Over.
Source: gamefaqs.com

(GEN) Extra bonus points (added 01.11.20):
During the game in NORMAL mode, there is a special drop down tile may apper which eliminates all ghosts below the level it landed. However, there is an option to turn this tile into a 2000 points instead. While it still moving, press Up + B.

(UNI) Extra difficulty (added 01.11.20):
At NORMAL'S MODE difficulty select menu you may choose between 4 options: "EASY" (Level 0), "NORMAL" (Level 10), "HARD" (Level 40) and "HYPER" (Level 100). However, if you put cursor to the "HYPER" option, hold Right before pressing A or B, then you will start at Level 300. Hold additionally Down to start with insane Level 900. Note, when you press Down cursor will change its position, so you need to push it a couple of times before holding up.

Pac-in-Time

(UNI) Secret passwords (added 06.01.21):
When any of these passwords are input, the message "WRONG PASSWORD" will be displayed. To start a game with any cheat, you must input one more time one valid password for any stage.

SNPSH	-	"SNAPSHOT MODE", allows you to hold the game screen by pressing Start. Press Start to return back to the game, or press Select to enter the actual "PAUSE" screen. In the Japanese version there will be a special message at the top of "PAUSE" or "LEVEL NUMBER" screens. In the US version this is removed for some reason.
LVSPM	-	"LEVEL SELECT". During the game, press Start to enter the "PAUSE" menu, put cursor to items, press Down to decrease level number, hold A then press Up to increase level number. Unpause to jump to a selected level.

Pachi-Slot Kids

(GEN) Intro skip (added 29.03.21):
At the title screen, hold A + Select then start a new game to instantly skip the intro.

(GEN) Hidden text (added 29.03.21):
There is a hidden copyright at the beginning of teh ROM:

PACHISLO KIDS K.TAKAHASHI 1993 MAY

Pachi-Slot Kids 3

(UNI) VS Mode cheats (added 02.04.21):
All these cheats only working for eighter the "1P TAISEN" or "2P VERSUS" game modes. Althought these cheat are DESIGNED for "2P VERSUS" mode, some of effects are applied to the player in "1P TAISEN" mode, but the rest aren't useful against the opponent. All codes are input after exactly third coin is inserted into the slot-machine. When code is input, press Down to start the rollers and thus apply the cheat. Any other button will disable the effect. When input is wrong, wait for the next iteration, insert 3 coins again and input the code one more time. You cannot input more than one codes at a time otherwise you'll get a corresponding message.

Left, Up, Left, B	-	STOLE 5 COINS from opponent
Left, Up, Up, Right, B, Right	-	STOLE 15 COINS from opponent
Up, Left, B, Right, Right	-	DOUBLE PRIZE for next 20 rolls for player
B, Up, Left, B	-	SLOW ROLLER for next 30 rolls for player
B, Up, Left, Up	-	HALF PRIZE for next 20 roll for opponent
B, Left, Left, Left, B, B, B, Left	-	INSERT ONLY 1 COIN for next 10 rolls for opponent
Up + B x 8	-	"STOP" nothing, but banner still working. Probably disabled one, since this is very tricky to press two buttons in this game at the same time.
B, Up, B, Up, B, Up, B, Left	-	NO BONUS GAME for next 50 rolls for opponent
B, Up, Left, Up, B	-	SLOW ROLLER for next 50 rolls for opponent
Left, Up, B, Left, Up, B, Left, B	-	ALWAYS BONUS GAME for player

Pachinko Monogatari Gaiden

(UNI) Secret passwords (added 07.11.20):
At the title screen, press Start, choose "STORY MODE" then "CONTINUE" input password: "あたまい　ちＸよよ　よよよよ". The "Ｘ" symbol may be one of letters between "あ" and "け" and allow access to a corresponding game stage instantly.

"あ"	-	Stage 1-1
"い"	-	Stage 1-2
"う"	-	Stage 1-3
"え"	-	Stage 2-1
"お"	-	Stage 2-2
"か"	-	Stage 2-3
"き"	-	Stage 3-1
"く"	-	Stage 3-2
"け"	-	Stage 3-3

(BUR) Debug leftovers (added 07.11.20):
During the game, set the RAM variable at $C68F to value $01. Now there are some debug functionality may be used:
When playing any machine in "PLAY MODE", press Up to toggle the display output and a debug edition of values. There is a number at the bottom-middle of the screen representing the debug activation. "0" meands disable the debug output and edition, "1" all enabled.
In the simple Pachinko machines in edition mode, hold B, press either Down, Left or Right to change some values.
In the advanced Pachinko machines in edition mode, hold Start then press either Up, Down, Left, Right or B to edit more various values different for different pachinko machine types.
In the Slot machine game only debug display is activated, there is no editing here. Also there is additional helper here. Before inserting a coins, hold Left and press B to insert all automatically.

Pachinko Saiyuuki

(UNI) Ingame passwords (added 07.11.20):
Start any pachinko machine game then press one of the button sequences below. If done right, the sound will be heard. Cheats may be disabled if entered twice. Also they may be combined so you may enter as much cheats as you want at once. Same cheat system may be found in many other Pachinko games by COCONUTS.

Start, Up, Up, Down, Down, Right, Left, Right, Left, Up, Up, Down, Down, Right, Left, Right, Left, Start	-	(0) Automatic balls deploy, no need to hold A.
Start, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, Start	-	(1) Forces the next gamble event on particular levels to always be won.
Start, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Start	-	(2) Displays the air flow power meter. Disables the screen flash when the ball hit any triggers.
Start, Left, Down, Left, Left, Left, Down, Left, Left, Start	-	(3) Does nothing.
Start, A, A, A, A, A, B, B, B, B, B, A, A, A, A, A, B, B, B, B, B, Start	-	(4) Does nothing.
Start, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, B, Start	-	(5) Game speed control. Current game speed delay is 2. When using this cheat, press Up to increase delay, press B to set the default speed, press any other button to decrease the delay down to 0 which lead to some weird behaviour - all balls are disappear from the screen.
Start, Up, Right, Up, Right, A, B, A, B, Up, Right, Up, Right, A, B, A, B, Start	-	(6) Press A against any pachinko machine. At the menu, press Start to cycle through all possible machine types. Hold Select then choose "YES" to instant win the machine.
Start, B, B, Right, Left, B, B, Right, Left, Start	-	(7) Does nothing.

(BUR) Game genie (added 07.11.20):
Although not working normally, all disabled cheats are still in the game ROM and may be re-enabled using the following Game genie codes.

A7E‑539‑E6E+6FE‑549‑2AB	-	Restores cheat (3) functionality. Display some internal information once activated.
B0E‑539‑E6E+6EE‑549‑2AB	-	Restores cheat (4) functionality. Enters the odds edit mode. There are 5 parameters. The first one is the odds for air flow speed decrease. The lower value, less air power decrease. Four other values are for machine hatches odds.
48E‑539‑E6E+6FE‑549‑2AB	-	Restores cheat (7) functionality. Enables the internal timer counter value, but this game does not use the timer IRQ so this editor does nothing as well.

Pachinko Time

(UNI) Ingame cheats (added 09.11.20):
Start any pachinko machine game, enter one of the following button seqeuces. A sound will confirm correct code entry. Cheats may be disabled if enter them twice. Also they may be combined, you may input as much cheats as you want. It seems this is the very first game for Game Boy by COCONUTS where such cheat system were implemented. You may find a lot of games developed by COCONUTS with similar cheat system. In addition to each code effect described below, any enabled code will disable the screen flash when the ball hit any triggers.

Start, Up, A, B, Down, B, Right, Left, Start	-	(0) Auto ball deploy, no need to hold A. Also this enables the air lever position display.
Start, Right, A, Left, Up, Left, Start	-	(1) Instantly win the gambling events in Pachinko game mode.
Start, Down, Left, Up, Up, Left, Start	-	(2) Disabled the random pachinko machines difficulty and types distribution. Instead the pre-defined fixed table is used.
Start, Left, B, Down, Left, Up, Left, Start	-	(3) Doubles the balls obtained in pachinko.
Start, Right, Up, Up, Down, Right, Right, Right, Left, Down, B, Start	-	(4) Odds editor mode. The first one value is the odds for air flow speed decrease. The lower value, less air power decrease. Four other values are for machine hatches odds.
Start, Down, Right, Down, Down, B, Right, Down, Start	-	(5) Frame advance mode. Press Up or Down to advance the game frame by frame. Hold Start then press Up or Down o return back to the normal mode.
Start, B, Down, Up, Left, Down, Down, Down, Left, Down, Right, Start	-	(6) Allow free movement mode on the game MAP. No need to beat the stages to walk across it.
Start, B, B, Right, B, Left, Down, Left, Down, B, Start	-	(7) Instant pachinko room exit. Now you won't have to beat at least 4 pachinko machines in current room in order to exit it.

(BUR) Hidden text (added 09.11.20):
Starting from 0x00A744 in the game ROM this particular string is repeated a couple of times:

Hideyuki!!

Pagemaster, The

(UNI) Cheat flags (added 29.09.18):
At the main game menu, enter Up, Down, Right, Left, Down, Up, Left, Right. A new menu option "CHEAT FLAGS" will appear. You can toggle on the infinite lives, stage skip and items select.
Source: nensondubois, tcrf.net

(UNI) Easter egg (added 29.09.18):
Enter the "Cheat flags" code sequence. Do not enter the cheat flags menu, still being at the main menu enter two more sequences: Down, Down, Right, Up, Left, Left, Down, Right then Up, Up, Left, Down, Right, Right, Up, Left. After every code the sound will confirm correct input. The first code changes the deadly objects in the Bonus stage to faces which appears to be a Fergus heads from the Mortal Kombat series. The second one also changes the main character when in the Bonus stage into something like penis. The second code may be entered only after the first one, you can't just change main character into penis only.
Source: nensondubois, tcrf.net

(UNI) Credits (added 29.09.18):
At the main game menu, enter Up, Right, Down, Left, Up, Left, Down, Right.

Painter Momopie

(FIX) Credits (added 09.04.21):
At the title screen, press A + B + Down + Right.
Source: gamefaqs.com

(GEN) Infinite continue (added 09.04.21):
Atthe title screen, press Select + A + B + Up.
Source: makainyumon.web.fc2.com

Panel Action Bingo

(UNI) Infinite lives (added 10.04.21):
Hold Up, then power up the console.

(UNI) Stage select (added 10.04.21):
At the title screen, choose "1 PLAYER" game, then "ALPHABET" or "NUMERIC" modes, but before pressing Start hold Left.

(BUR) Game genie (added 10.04.21):

068‑1DF‑E66+078‑60F‑F7A+078‑A4F‑F7A	-	Re-enable three more game options at "OPTIONS" screen. All options are mostly programmed but works odd sometimes, so it seems they aren't finished yet or were planned but then dropped out. "MOVE STAR" adds additional object on the field with no grapchics assigned, you may move it and it will block one of squres. You cannot remove it from the corner and sometime this may cause impossible to complete level. "GET BACK" just removes enemy's marked blocks, obviously they not used it in the final version. "POISON" causes slow down movement sometimes.
9A3‑5BF‑B32+303‑5CF‑C4E	-	Re-enable unfinished "ITEM SELECT" menu for "2 PLAYERS" game mode. Press Select during the game, choose an item to strike the opponent. They are mostly similar to those in "1 PLAYER" mode in options screen.

Panel no Ninja Kesamaru

(UNI) Secret passwords (added 17.10.17):
Two of three working secret cheats skips to the main menu upon succesfull entering without indication. You can either start a new game or enter any other passwords including the secret one. All effects are combined.

5-9-6-3	-	Ending.
1-1-2-0	-	Invincibility to all enemies and its projectiles.
8-8-1-6	-	Trainig mode. At the Stage select screen, press Select to switch castles, press B to skip to the second part of levels for current castle. Beating the stage in this mode does not removes it from selection. So you can play any stage, but can't save any results.

Parasol Henbee

(UNI) Cheat mode (added 13.04.21):
At the title screen, press at least once every D-Pad button in any order (i.e. Left, Right, Up, Down, etc..) then press Start to start a new game. During the game, any time, hold Select and press A to instantly skip to the next level up to ending or press B to play memory mini-game. Press Start to pause the game, then use Up or Down to ncrease or decrease health points.

Parasol Stars: The Story of Bubble Bobble III

(UNI) Unlimited continues (added 14.04.21):
At the copyrights and license screen, quickly press Up, Up, Down, Left, Left, Right, B, A and wait until "CHEAT MODE" screen is displayed.

Parodius (USA, Europe), Parodius Da! (Japan)

(GEN) Sound test (added 15.04.21):
At the license screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A.
Source: gamefaqs.com

(GEN) Maximum weapon power (added 15.04.21):
During the game, press Start to pause, press Up, Up, Down, Down, Left, Right, Left, Right, B, A then unpause.
Source: gamefaqs.com

Peetan

(UNI) Bonus hint display (added 16.04.21):
At the title screen, press Left + Down + A + B at the same time. During the game, while playing any Bonus round where you need to mash the B button as fast as you can (2, 4, 6, etc...) to win, you'll see the number at the top-left corner of the screen representing your current pressing speed.

(UNI) Title screen cheats (added 16.04.21):
At the title screen, input one of the following button sequences to get a corresponding effect

Up, Up, Down, Down, Left, Left, Right, Right, B, A, Select	-	Sound test.
Up, Down, Left, Right, B, A, Select	-	Round select before starting a game.
B, A, B, A, Select	-	Bonus round select before starting a game.

Peke to Poko no Daruman Busters

(UNI) End level (added 20.01.17):
At the game setup screen in 1P mode, press B at least 150 times (but not much than 255). Now press Select to change the starting level up to END, the final level, which is normally can't be selected.

(BUR) Game genie (added 20.01.17):

80F‑FFC‑E6A

Re-enables a debug leftovers. Now, any time during the game press Left + Select to hold the game on pause without cleaning the screen, press any button to return to normal state. Additionally, you can select the END level at the game setup screen without cheat.

Penguin Wars (USA), King of the Zoo (Europe), Penguin-kun Wars VS (Japan)

(FIX) Level select (added 12.08.18):
At the player select menu, hold Left + B and press A. A number will appear at the bottom-right corner of the screen. Press Up/Down to change it. The resulting Game number equals to (selected number - 1) times 4 plus 1 (for exmple selection 02 means (02-1)*4+1=5th game, or 10 means (10-1)*4+1=37th game - which is max game number here). Press A to begin the game.
Source: gamefaqs.com

(UNI) Sound test (added 12.08.18):
At the player select menu, press Select + B at the same time to change currently playing background music. There are total 12 tracks. After track 12th music will warp back to the first track.

(UNI) Play with the same character (added 12.08.18):
There is an option to play against the same character as yours but for some reason it is possble only on Level 22. After beating level 21, hold B and wait for the "YOU WON THE SET!" message appear.

Penta Dragon

(GEN) Max items (added 17.04.21):
When starting a new game, at the "STAGE LOAD" screen, hold Up + Select then press A. This will fill you MEDICAL slots with 10 HEALx3 items, SPECIAL slots with DRAGON items, and PROTECT slots with STAR items. Worth nothing, but you will get the same items when entering the STAGE 6 instantly.
Source: urawaza.in, gamefaqs.com

(UNI) Kill boss with one shot (added 17.04.21):
During the game, on any level, kill exactly 200 simple enemies (mini-bosses does not count), while entering the boss at the BOSS XX screen hold A + B + Select + Start + Up. The boss HP counter will drop down to 1 instantly.

PGA European Tour

(GEN) Practice hole skip (added 20.04.21):
During the game in the Practice mode, hold Select, then press B to skip to the next hole instantly. If additionally to Select hold Start and press B then current hole will be restarted.

PGA Tour '96

(GEN) Practice hole skip (added 20.04.21):
During the game in the Practice mode, hold Select, then press B to skip to the next hole instantly. If additionally to Select hold Start and press B then current hole will be restarted.

Picross 2

(GEN) Instant demo sequence (added 15.09.18):
At the title screen, press A + B to instantly switch to one of two demo sequences without waiting for them.
Source: urawaza.in

(UNI) Simple rulers (added 14.09.18):
During the game, hold B, press Select to toggle between simple kind of rulers and the regular ones. The simple kind does not magnify the numbers in highlighted rows/colums and also blinking. The similar type of rulers were used in the first part of this game.

(FIX) CRAM clear (added 14.09.18):
To erase an individual save slot, at the "DATA SELECT" screen, put cursor to slot to be erased and hold A + B + Select for a while, then press A when game asks. To erase all saved data at once, before powering the console, hold Up + Left + Select then power it up. Game will ask "ERASE?". Press corresponding button to agree or decline.
Source: gamefaqs.com

(GEN) SGB extra border palettes (added 14.09.18):
In SGB mode, at the title screen, hold one of following buttons and press Start to change default border to "GAMEBOY POCKET" border with a corresponding color:

Up	-	Black
Down	-	Yellow
Left	-	Green
Right	-	Red
B	-	Gray
Select	-	White

Source: gamefaqs.com

(BUR) Hidden text (added 14.09.18):
The game uses following name as part of the internal RAM signature:

Ogata Kitawaki

Also the sound engine bank contains copyrights of the composer:

DSEQLITE
CRTS(C) mcmxcvi by Toshiyuki Ueno
toshi-u@tau.bekkoame.or.jp

Source: tcrf.net

(BUR) Game genie (added 14.09.18):

010‑2D8‑F72

Re-enables rather unfinished debug menu. At the title screen, press A + B, the Debug menu appears instead of the demo sequence. The graphics is broken somehow. Most options except "BGM"/"SE" does not work properly. The "TIME" options does absolutely nothing, it's dummied. The "KEY" option displays sprites one by one, but since there is no CHR data set for any of them you'll see mostly text among the garbage. It seems this code were intended to be accessible via title screen codes like "Instant demo sequence" code. When you press A + B at the title, the internal variable gets one of two non-zero values: 5 and 6 for demo and instructions screens correspondingly. There are more values that game checks: 1 for debug menu (used in code above), 4 for ending, 7 for stage clear screen and any other non-zero value to play final puzzle. You may test them if replace first "01" in aforementioned Game genie code with a corresponding number.

Source: tcrf.net

Pingu: Sekai de 1ban Genki na Penguin

(FIX) Secret passwords (added 22.04.21):
Let's assume, at the password screen, all portraits are numbered from left to right from 0 to 5: 0-PINGU, 1-SNOWMAN, 2-DAD, 3-MOM, 4-DOG, 5-PINGA. Now use this conversion list to enter passwords below.

2,3,0,5	-	Day 1 (unlockable)
0,1,4,2	-	Day 2 (unlockable)
4,5,2,1	-	Day 3 (unlockable)
3,0,4,2	-	Day 4 (unlockable)
1,5,3,4	-	Free Play (unlockable)
0,2,3,5	-	Sound Test Source: gamefaqs.com
0,4,5,1	-	"THE SYMBOL OF NATURE" hidden picture
0,1,2,3	-	"PINGU LET'S DANCE" hidden animation
0,2,4,5	-	"GOODPLAY" all animations
2,3,2,3	-	"CONGRATULATIONS" all animations
1,3,5,4	-	Credits
4,2,0,1	-	"BADPLAY" all animations
0,2,4,3	-	"GOODPLAY!!" all winning screens

Pipe Dream

(GEN) Secret password (added 23.04.21):

PIPE

Play in "STAGE B" mode, much more like Tetris than original Pipe.

Source: urawaza.in, gamefaqs.com

Pit Fighter

(GEN) Instant continue (added 26.04.21):
At the "STILL THE BEST" screen (Game Over), hold Down, then pres A.
Source: gamefqas.com

Pocket Bomberman

(UNI) Secret power-up (added 12.05.17):
At the Stage name and number screen in normal game mode, press Left, Right, Left, Right, Up, Down, Up, Down, B, Left, B, Right, B, Up, B, Down, then press Start or A to begin to play. This will enable the special in-game counter which counts the bombs you placed on the stage. When counter reaches the predefined value (different for every area), the sound will be heard and a small flower-like prize will appear near the exit door. Get it to power-up to MAX bomb count, MAX explosion range and get the manual controlled primer. Note, this cheat works only for areas 1 to 4, and if bombs count and explosion range both less than 3. Also note, when you dies or moves to the next stage, the secret is resetting, so you must input the cheat again. The following table contains a numbers of the bombs needed to be placed on every area in order to obtain the Secret power-up.

	\|	Area 1	\|	Area 2	\|	Area 3	\|	Area 4
World 1	\|	10	\|	20	\|	30	\|	15
World 2	\|	20	\|	30	\|	40	\|	15
World 3	\|	20	\|	30	\|	30	\|	15
World 4	\|	15	\|	20	\|	30	\|	20
World 5	\|	20	\|	30	\|	10	\|	20

(BUR) Game genie (added 12.05.17):

0F2‑BDC‑E6E

Restores the disabled Debug menu at the game's boot-up. Note, you just couldn't see any readable text due to lack of proper font, to fix you need to hack it in manually.

Source: tcrf.net

Pocket Mahjong

(BUR) Game genie (added 26.05.21):

03C‑9CF‑B3B	-	At the game mode menu, re-enables simple sound test leftovers. Press Start to cycle between 5 different melodies.
072‑88E‑C4A	-	Re-enables somehow a developement stage Memory viewer/editor. Press Start to open it. Due to hacky method of accessing, in order to see something, you need to press any other button one more time then. Also you can't return safely back to the game. The actual input handler for calling this routine went unreferenced and not known where it should be called itself.

Pocket Puyo Puyo Tsuu

(GEN) Special Custom menu (added 01.06.21):
At the title menu, put cursor to the rightmost option ("OPTIONS"), then press A + B. The additional "SPECIAL CUSTOM" option will be activated at the "OPTIONS"->"GAME SETTINGS"->"CUSTOM" menu.

Pocket Monsters: Green (Japan), Pokemon: Blue Version (USA, Europe), Pokemon: Red Version (USA, Europe), Pokemon: Yellow Version (USA, Europe)

(GEN) CRAM clear (added 12.08.21):
At the title screen, hold Up + B + Select and press Start.

Pokonyan!: Yume no Daibouken

(BUR) Hidden text (added 13.08.21):
There is a hidden copyright sctring near the ROM header:

(C)1993 FUNARI

Source: tcrf.net

Ponta to Hinako no Chindouchuu: Yuujou Hen

(GEN) Stage skip (added 13.08.21):
During the game, press Start to pause then press Up, Up, Down, Down, Left, Right, A, B, Select, Select.
Source: makainyumon.web.fc2.com

Pop Up (USA), Cool Ball (Europe)

European version:

(UNI) Secret passwords (added 25.11.16):

1NDRQLLQ

Extra 99 Water, 99 Hammers and 99 Keys, Infinite lives and Stage select (in the pause mode press Up/Down).

Pop'n TwinBee (Europe), TwinBee da!! (Japan)

(GEN) Fixed triple phantoms (added 14.08.21):
During the game, collect Bell prize with "eye" to obtain triple phantom TwinBee power-up. The regular behaviour for this power-up is to shrink all phantoms to the main object when not moving, so in order to have wider fire range you must always move. However, if you press Start to pause the game, then input a Konami code Up, Up, Down, Down, Left, Right, Left, Right, B, A, then unpause, the power-up behaviour will change. The phantoms will not shrink anymore, whey will stay at the same places even if the main ship not moving. The effect will stay until first death and can't be used another time during the same game.
Source: urawaza.in

(GEN) Instant Miracle Ball (added 14.08.21):
During the game, there is a special ground prize - candy which gives you a triple-way shot weapon. If you collect another candy while still possessing one you'll have a Miracle Ball weapon projectile. However, if you hold Select when obtaining any candy prize you'll have the Miracle Ball instantly.
Source: urawaza.in

(GEN) Borrow life (added 14.08.21):
During the game in "2 PLAYERS" mode, the players with "GAME OVER" can press A + B to borrow life of another player if it has non-zero life counter.
Source: urawaza.in

Popeye 2

(GEN) Sound test and Sstage select (added 16.08.21):
At the title screen, input Left, Up, Right, Up, Left, Left, Up, Right, Up, Left, Up.
Source: urawaza.in, gamefaqs.com

Populous

(UNI) Scenario select (added 22.09.21):
Start a new "CONQUEST" mode game, at the scenario info screen, hold A + B + Up then press Select to advance to the next scenario instead of input scenario password. There are 988 scenarios in total. However with this code you may select scenarios up to 994. All extra scenarios has a dedicated passwords ("FUTDEOLD", "SUZDIBOY", "DOUKOPDOR", "SHIQAZPAL", "HURTIHOLE", "JOSELAS") but all of them are unplayable, most of them uses default "test" skin of the terrain.

(BUR) Hidden text (added 22.09.21):
There are several debug leftovers in the game code displaying some debug information about current game status. However, most of the code not linked to anything and does not have any proper way to be diplayed without some advanced hacking. There are some texts rendered unused because of that.

FLAGS
PLAYER
IQ
WEAPONS
POP L
POP H
B POP
HOUSE
X POS
Y POS
DIRECTION
FRAME
HEAD FOR
IN OUT
MAG LAST
STATUS
PLAYER NO.

Power Mission

(GEN) Max power to all ships (added 22.09.21):
During the game, while your fleet is moving, hold B + Select + Left at the "ENEMY SEARCHING" screen before it change either to "MOVE" or "ATTACK" screen. When the moving sequence is over those players units that has been affected with this code will have 99 "SURVIVAL CAPACITY" and power. This may be done for all units at the same time, just hold forementioned buttons all the time, or for particular units. Also this may be done as much times as you wish.
Source: gamefaqs.com

(FIX) Secret passwords (added 22.09.21):

USA	\|	Japan	\|	Mission
BYRBYD	\|	BYROAD	\|	"Seawall Island"
LTNGTH	\|	LENGTH	\|	"Deadly Eight"
CHRRGM	\|	CHARGE	\|	"Sea Chamber"
TW7ST7	\|	TWIST7	\|	"Swamp Land"
6PTRTS	\|	6PARTS	\|	"Cursed Straits"
55T5D5	\|	55TIDE	\|	"Innocent Sea"
C90VDP	\|	C90VAP	\|	"Twilight Island"
BWFWL8	\|	AWFUL8	\|	"Diamond Island"
BYRWGY	\|	BARWAY	\|	"Dragon Channel"
LRDMR1	\|	ORDER1	\|	"Last Mission"
GRCGRC	\|	BAKKIN	\|	Sound test.

Source: gamefaqs.com

Power Pro GB

(GEN) CRAM clear (added 24.09.21):
At the title screen, press A + B + Select at the same time. Now either press Start to clear all CRAM data or other non D-Pad button to exit without erasing the data.

(BUR) Game genie (added 24.09.21):

00E‑ECB‑C4D

Re-enables the debug output during the main game sequence, see the numbers running at the top-left corner of the screen. There are some more debug leftovers, but mostly only the debug menu displaying routines with other code and fonts being removed completely, so the rest renders unusable.

Prehistorik Man (USA), P-Man (Japan)

(UNI) Intro screen cheats (added 09.01.18):
At the "PROUDLY PRESENTS" screen, enter one of the following cheat sequences to get the corresponding effect.

Down, A, Up, B, Left, Right, B, A, B, A, B, A, Up, Down	-	The 3D scroller with text "CHEATED - YOU HAVE ACTIVATED THE CHEAT MODE MAY ETERNAL LIFE BE YOUR'S" will be displayed. From now you is fully invulnerable. Also Select during the game to skips the current level (working on the boss stages as well). Source: gamefaqs.com
Left, Right, B, A, Up, Down, A, B, Right, Left	-	The 3D scroller with the secret developer message will be displayed. You can't skip this scroller unless you reset the GameBoy. The full text of this message you can see below. For convinience all 5-character spaces are converted to line breaks. The actual text have no lines at all. PICT OF LOGON PRESENTS YOU THIS OTHER PART OF THE DEMO. THE 3D SCROLL DEMO. WELCOME TO THE AMSTRAD CHEAT! EVERYBODY WANTS TO BE GREETED IN A GAMEBOY GAME,I KNOW.. GREETINX TO.. ALL CPC FREAX! VERY SPECIAL THANX TO.. BSC AND KANGAROO MUSIQUE OF HJT. WITHOUT BSC'S SOUNDTRAKKER AND KANGAROO'S COMPOSING ABILITIES THERE WOULD NOT BE ANY COOL MUSIC IN THIS GAME. DANKE THORSTI UND OLLI! IF YOU DO NOT KNOW WHAT I AM TALKING ABOUT.. THE AMSTRAD CPC IS AN 8 BIT HOME COMPUTER AND WAS PUBLISHED IN EUROPE BACK IN 1984. IT IS LIKE A GAMEBOY WITH COLOUR SCREEN AND KEYBOARD. MEMORY FULL,BYE...

(BUR) Game genie (added 09.01.18):

00D‑658‑6EA+00D‑668‑D5A

There is a working crash handler inside both regional versions of this game. Two working asserts are exists on the Boss stage, checking some parameters to be valid. If not, the crash handler will be displayed. With these codes you can trigger one of the checks and see this crash handler as soon as reaches the Boss stage.

Source: tcrf.net

(BUR) Cheat protection (added 09.01.18):
There is a hidden simple cheat device detection in this game. When you losing a life or HP, code will compare both parameters against its previous values after decrementing them. If values are still the same (so you must be using some device to freeze memory values like Game genie or Game Shark), the message "YOUR GAMEBOY IS FITTED WITH EQUIPMENT THAT IS INCOMPATIBLE WITH THIS GAME" will be displayed as the same 3D scroller as in cheats above. The scroller is can't be skipped as well as the secret message unless you reset the GameBoy.

Prince YehRude (Unlicensed)

(UNI) Stage complete screen cheats (added 28.09.21):
After completing any stage, at the screen with current password, press one of the following button combinations to get a corresponding effect.

A + B + Select	-	Start next level with 10 lives.
A + B + Up	-	Play "Dices and Numbers" bonus game.
A + B + Down	-	Play "Code cracker A" bonus game.
A + B + Left	-	Play "Code cracker B" bonus game.
A + B + Right	-	Play "Memory pairs" bonus game.

Pro Action Replay (Unlicensed)

(UNI) Test screen (added 29.09.21):
At the "non license" screen, press Select + Start. ROM version and dates will be displayed as well as the results of the internal RAM test.

Pro Mahjong Kiwame GB

(UNI) Alternative soundtrack (added 01.10.21):
At the title screen, hold A + B the press Right. The title screen music and all ingame soundtrack will change to a rather modified version of the soundtrack of "Mogura de Pon!" game. Note, this works only in regular GB mode. The SGB mode soundtrack have no enhanced version of alternative soundtrack. While holding A + B press any other button to switch back to the regular soundtrack.

Prophecy: The Viking Child

(GEN) Ingame music toggle (added 02.10.21):
Pause the game with Start, press A to disable background music, or press B to enable it back.

(GEN) Ingame reset (added 02.10.21):
There are two different types of in-game soft-resets. One is a generic for GB: A + B + Select + Start at the same time any time during the game will return you to the license screen. The second one works on pause: press Up + Select, and return you to the the title screen instead.

(UNI) Stage skip (added 02.10.21):
At the Map screen, press Select, Up, Up, Down, Down, Select to skip to the next stage instantly. Last stage will skip back to the first stage.

(UNI) Max HP and all weapons (added 02.01.21):
During the game, press Start to pause, then input Select, Up, Up, Left, Right, Down, Down, Left, Right. The screen will start flashing. Press Start to unpause. Now you'll have HP refilled to 99 as well as all possible weapons (3 bombs, 9 grenades, 1 sack and 6 fireballs).

Punisher, The: The Ultimate Payback

(GEN) Title screen cheats (added 03.10.21):
At the title screen, input one or more following button sequences to get a corresponding effects combined. A screen will flash if done right. Press Start to start the game with selected effects.

Up, Down, Down, A, Right, Down, A, B, Right, A, Left, A, B, Right, A-Infinite lives

B, A, Right, Left, Up, Down, Down, A, Up-Stage 2

B, A, Right, Left, Up, Down, Down, A, Right-Stage 3

B, A, Right, Left, Up, Down, Down, A, Down-Stage 4

B, A, Right, Left, Up, Down, Down, A, Left-Stage 5

A, B, Right, A, Down, A, B, Right, A-Infinite Ammo

Down, A, B, B, A, Down, A, B, B, A-Infinite Grenades

Right, A, B, B, Left, Up, Right, B, A-Infinite Missiles

Source: gamefaqs.com

Puyo Puyo

(FIX) Ending sequence (added 22.10.20):
Enter "OPTIONS" menu, then "KEY CONFIG" sub-menu. Hold Select then press A, B, A, B, A. Release Select and press Start.
Source: gamefaqs.com

(GEN) Level select (added 22.10.20):
At the title menu, enter "START SINGLE PLAYER" game mode, at the difficult level select screen, hold Select, then press Up a number of times corresponding to a desired stage. i.e. press Up 5 times to start with Level 5.
Source: gamefaqs.com

Puzznic

(FIX) Sound test (added 06.10.21):
At the title screen, press and hold A + Select and wait until "SOUND TEST" appears.
Source: urawaza.in, gamefaqs.com

(FIX) Secret passwords (added 06.10.21):

PUSH AREG	-	Round 1 (rather useless, but this password exists!)
PLAY ER..	-	Also Round 1
RESE T...	-	Resets the console.
IREC HAIY	-	Round 129 (self-solving pass, no need to do something), after completing this one password "RESET..." will be displayed. Next round with number 130 is the very last Round in this game and this time it is unbeatable, so you cannot advance after that.

Source: makainyumon.web.fc2.com

(BUR) Game genie (added 06.10.21):

162‑02B‑B3A	-	Replaces the "1 PLAYER" game mode with rather unfinished draft of "2P HANDICAP" game mode. There are no game input except some basic Start and Select hooks, so you can't even play it.
843‑DCD‑F7B	-	Replaces "RETRY?" screen with rather unused "ROUND SELECT" screen. During the game press Start, select the stage and pres Start again.
943‑DCD‑F7B	-	Same as above, but replaces with another test routine. After pressing Start there will be displayed one by one 6 pictures with various girls that usually displayed after solving every 10 puzzles in row.
7F5‑21D‑3B5+2E5‑22D‑5DE	-	In addition to previous code, use these two codes to replace the regular picture routine with unused one displaying a single picture of a girl surprisingly different in style from any other anime-like pictures in this game.

Pyramids of Ra

(BUR) Hidden text (added 09.10.21):
There is a hidden copyright string at the very beginning of the ROM:

SOFTWARE AND HARDWARE DESIGN BY JOHN MORRISON (MICROS) 1/9/19

Also there are some unknown sources leftoves at 0x76C.
Source: tcrf.net

(BUR) Game genie (added 09.10.21):
There are some unused game objects along with "inctroduction" sequences for them. Use following Game genie codes to replace the very first "INTRODUCED 1 BOUNCE TILE" with one of the unused "introduction" screens. During the regular game, there are no bouncing limits for any moving tiles, so these onese are as well unused.

2D2-DAF-4CB+4B2-DBF-80F	-	"INTRODUCING MOVING 2 BOUNCE TILE".
032-DAF-4CB+4C2-DBF-80F	-	"INTRODUCING MOVING 3 BOUNCE TILE".

Q Billion

(FIX) Secret passwords (added 09.10.21):

WALL	-	Unlock levels 31-40
IDEA	-	Unlock levels 41-50
NOON	-	Unlock levels 51-60
KING	-	Unlock levels 61-70
YARD	-	Unlock levels 71-80
SALT	-	Unlock levels 81-90
ONCE	-	Unlock levels 91-100
FATE	-	Unlock levels 101-110
TOIL	-	Unlock levels 111-120

Source: gamefaqs.com

Q-bert for Game Boy

(GEN) Watch all movies (added 11.10.21):
At the title screen, input Right, Up, B, A, Down, Up, B, Down, Up, B to see all demo sequences in row, which normally displayed one by one every 5 levels.
Source: urawaza.in, gamefaqs.com

Qix

(GEN) Disable QIX sound effect (added 11.10.21):
At the title screen, hold Left, then press Start. This will disable very annoying sound effect of the Qix movement.
Source: gamefaqs.com

(BUR) Game genie (added 11.10.21):

010‑07F‑E6A

Re-enable debugging feature. At the title screen, hold A then press Start to activate the invincibility mode. This code may be combined with the code above if you hold Left + A at the same time. Also all these effects are working in "2 PLAYERS" mode for both players.

Quiz Nihon Mukashibanashi: Athena no Hatena

(GEN) Secret passwords (added 04.06.16):

ZXTB or GSXR

Sound test.

Source: urawaza.in, tcrf.net

(BUR) Game genie (added 04.06.16):

011‑95F‑E6A

Re-enables the quiz questions test mode.

R-Type

(GEN) De Souza Editor (added 13.10.21):
At the Hi-Score screen, press Left + Down + A + B at the same time. The screen with instructions will appear first. Follow the instructions to draw some pictures on the screen.
Source: urawaza.in, gamefaqs.com

(UNI) Seret menu (added 13.10.21):
At the title screen, when all text completely drawn, quickly hold B then press Down, Right, Right, Right, Right, Right, Right, Right, Right, Right, now while holding B press and hold A as well, then press Left, Left, Left, Left, Left, Left, Up, Up, Up, Up, Up, Up. If you do this before the secondary title screen appears you'll see the secret menu with infinite lives toggle option. This cheat may be done by accident sometimes because input register code does not check for errors, only for correct input. So you may just hold B, then mash D-Pad buttons for a couple of seconds, then additionally hold A and mash D-Pad some more time.

Racing Damashii

(UNI) Easter egg (added 13.10.21):
Start a new game either in "Practice" or "2P Race" mode. Complete any race, then while finish flag is waving hold Select + Start and wait until race results screen with girl apears. If done right, some weird one-eyed character will walk through the screen from right to left and shout "ま!" ("MA!"). Same character and similar easter can be seen in "Castle Quest" for NES, programmed by the same developer Ryoiti Ookubo (which also made infamous "Noriko dedication" easter in "Battle City" for NES.

Raging Fighter (USA, Europe), Outburst (Japan)

(FIX) Same character select (added 01.11.20):
At the title screen, input the main portion of the infamous Konami code: Up, Up, Down, Down, Left, Right, Left, Right. To finish the code sequence press two more buttons, either A or B. Depending on the last two buttons combination one of four internal cheat flags is raised. If done right a sound will be heard, otherwise you need to restart the title screen either by waiting for the demo loop or enter and exit back the OPTIONS mode. Flags are combined, you may input more than one code also after restarting the title screen. Depending on cheat flags, effect differes a little, see table below. When any flags are set the additional string will be displayed at the OPTIONS screen: "COMMAND ON". A squares to the right of it indicates which cheat flag already set.

B, A (1) or B, B (4)	-	In 1PLAYER PRACTICE mode allows to select the same 2P CPU character as for 1P. The second combination also disables the different shading for same characters on the arena.
A, B (2) or A, A (3)	-	Same but for VERSUS mode. Second code also disables alt shading for same character. Note, both players must input same code in order to use it.

Source: gamefaqs.com

Rampart

(BUR) Game genie:

5F3‑CEB‑7FC

Select 1 PLAYER game, then enter options. The Sound test will appear instead.

Source: tcrf.net

Ranma 1/2

(GEN) Suicide (added 15.10.21):
Any time during the game, hold A, press Select.

(UNI) Title screen cheats (added 15.10.21):
At the title screen, hold B then input one of the following button sequences to get a corresponding effect.

Right, Up, Left, Down, Select, A	-	Extra 9 continues.
Left, Left, Right, Right, Select, A	-	All Stages starts from Round 6.

Ranma 1/2: Netsuretsu Kakutou Hen

(GEN) Secret passwords (added 20.10.21):
To input a password, you need to select three character's pictures in a particular order from the table below.

Ukyo, Ryoga, Ranma	-	Battle test
Ranma, Akane, Muusu	-	Sound Test
Kuno, Ranma, Ukyo	-	Visual Test

Source: tcrf.net

Ranma 1/2: Kakugeki Mondou!!

(UNI) Hidden credits (added 20.10.21):
Complete the game first. When the STAFF roll is over and message "PRESENTED BY BANPRESTO" is displayed on the screen, press A 50 times and B 50 times in no particular order. There will be three more hidden names displayed: "SEKI HIDEKI", "TAKEYABUYAKETA", "KUCYU DOHYOU".

(BUR) Game genie (added 20.10.21):

0B2‑AFF‑D5A+032‑B0F‑E6B

Replace the PASSWORD option with rather unused and disabled SOUND TEST mode. Just use Up and Down to select music track or sound effect, press A to play it. Note, the numbers here kinda broken, so it seems this test were abandoned early at the developing process.

Ren & Stimpy Show, The: Space Cadet Adventures

(UNI) Hidden messages (added 20.11.19):
There are a couple of developers credits that might be revealed throught the first game stage. In order to see them, you must to jump up on a specific obstacle within first three screents of the first stage, then press Start + Select + B + Up. This will pause the game, so you must unpause it in order to get the effect. Due to specific of the cheat reading code, you may be need to push the button combinations a couple of times of just held it for a while. Also this cheat is toggles the invincibility on and off. But as for mentioned specific of the button code reading you just can't say for sure if you toggle this cheat once or twice. So in order to get an invincibility here, you need to try to input the code on a specific place, then test if you can't die. There are four different screen positions where the cheat is triggered: position 0 - the top of the chair; position 1 - the top lower handle; position 2 - the top of the higher handle; position 3 - the top of the monitor on the panel. So here is the list of positions and a corresponding name you may reveal there.

Screen	\|	Position number	\|	Name
0	\|	0	\|	"TAK TAK TAK"
>1	\|	0	\|	"DAN"
0	\|	1	\|	"MIKE"
>1	\|	1	\|	"BILL"
0	\|	2	\|	"GLEN"
>1	\|	2	\|	"AMY"
0	\|	3	\|	"KEVIN"
1	\|	3	\|	"KATHY"
>1	\|	3	\|	"MARK"

Ren & Stimpy Show, The: Veediots!

(BUR) Game genie (added 20.11.19):

001‑4BF‑08B

Re-enables two debug cheats. During the game press one of the following combinations to get a corresponding effect.

Up + Select + B	-	Stage skip.
Down + Select + B	-	Infinite health.

Reservoir Rat

(GEN) Secret passwords (added 22.10.21):

LETMELIVE1	-	Level 1
LETMELIVE2	-	Level 2
LETMELIVE3	-	Level 3
LETMELIVE4	-	Level 4
LETMELIVE5	-	Level 5

Source: gamefaqs.com

Riddick Bowe Boxing

(UNI) Secret name (added 25.10.21):
Begin a new "CAREER" game. As a name input "FINNEGANS WAKE". From now, your POWER/SPEED/STAMINA will be at MAX values, also you can select yourself as opponent for the fight. Additionally, at the "VS" screen hold either Select or B then press A to correspondingly win or lose fight with "KO" in the first round instantly.

Roadster

(FIX) Secret names (added 05.11.21):
Start a new game, when asked to "NAME CHANGE" choose "YES". Erase previous name then input one of the names from the table below. Finally, after name is entered you must set cursor to a letter corresponding to this name (also see table) and press Select + Start. Note, if you enter the correct name and press Select + Start you'll hear a sound, but this does not mean the code is actually triggered if cursor was not in the right position. Also note, in the secret names list there is one unused: "MOTONO".

Name	\|	Letter	\|	Effect
TAROU	\|	"Y"	\|	Any course can be selected in "RACE MODE" with A or B buttons. This code also works in "2 PLAYERS" mode. Source: urawaza.in
HANAKO	\|	"J"	\|	Extra 255 continues for "RACE MODE" after "RETIRE".
YUUTA	\|	"T"	\|	Max car speed instantly.
RYUITI	\|	"O"	\|	Instant 16 power points to increase "BODY" and "TIRE" powers before the game.
TAKOSU	\|	"T"	\|	Switch to Game Loop 2 (regular way to activate Loop 2 is to finish the game once). In this Loop enemies ar thoughter and ground texture changes to noisy gray.
MIYUKI	\|	"M"	\|	Switch to Game Loop 3 (same as previous but you need to beat the game twice). The only significant change here is there are no ground arrows indicating turns.

Robin Hood: Prince of Thieves

(UNI) Hidden credits (added 28.10.21):
There is a special item in this game, it's not hidden actually but it seems many people haven't noticed it! In the mission "HAUNTED WELL", find the well, down to it, then process to the Druids caves. Upon entering, go to the very first leftmost room with a skeleton and a piece of paper. This paper is "THE CREDIT LIST", read it to reveal the hidden game credits. As a side note, the Spanish translation made quite simplier than original, but the German version has the translator itself added to the list.

(GEN) Secret passwords (added 28.10.21):
At the title screen, press A, A, A, A, A, A, A, A, B, B, B, B, B, B, B, B to enter the secret password screen. Input one of the passwords below to get to desired game level.

CATACOMB	-	Outside Arab jail
WALL	-	Hadrian's Wall
LOCKSLEY	-	Locksley Castle
DUBOIS	-	Dubois Manor
CHASE	-	Horse race to Sherwood
CATHEDRA	-	Rescue the maiden
BOAR	-	Battle the boar
MASTER	-	Search for Master Trainer
CHAPEL	-	Meet Marian at chapel
WELL	-	Search for haunted well
TAX	-	Attack gold wagons
POND	-	Search for healing water
VILLAGE	-	Defense of Sherwood Village
CELTS	-	Battle Celts
TOWN	-	Journey to town
TOWNHANG	-	In town, by gallows
CASTLEIN	-	Inside Sheriff's castle
MARRIAGE	-	Ending

Source: tcrf.net

RoboCop

(BUR) Game genie (added 01.11.21):

CB1‑EDB‑4C7+451‑EEB‑E67 (for the Japanese version) AA15DEBB‑7F7+451‑ECB‑E67 (for the US version)	-	Replaces the intro messages with one unused dedication message probably intended to be displayed as a secret but left unreferenced.
6AD‑5DB‑805+4BD‑5EB‑C43 (for the Japanese version) 49D‑3CB‑080+4BD‑3DB‑C43 (for the US version)	-	Re-enable unused ufinihed Password entry screen. Passwords are coded as simple lines of "0000" to "8888". Due to hacking method the actual stage selection isn't working with this code, sorry lol. However, there are also two secret passwords exist: "0618" and "6544". The first one shows "HI.OCEAN" message on the screen and enables the credits roll normally enabled after game is beaten. The second one must be input after the first one were activated and shows another message ("HI.GERALD") but due to programming mistake it shows generic "PASSWORD IS OK".

Source: tcrf.net

RoboCop 2

(GEN) Ending (added 01.11.21):
At the title screen, press A + B + Select + Start + Left.
Source: gamefaqs.com

RoboCop Vs. The Terminator

(UNI) Cheat mode (added 01.11.21):
Start a new game. In Stage 1, hold Select + B, then jump 10 times. Make sure you full landed before another jump in order to trigger this cheat. If done right, a few options now available during the game. Note, this is common kind of cheat features used by programmer Cary Hammer (Unexpected Developement/Visual Concepts) in its games.

Button code	\|	Effect	\|	Notes
Press Start	\|	High jump	\|	Pause mode not available anymore.
Hold A, press Select	\|	Dash forward	\|	Throws character forward for a couple of tiles without collision tests. Use it in conjuction with code above to advance faster through the level.
Hold Select, press Up	\|	Toggles invincibility	\|	Also working on the "Stage Intro" screens.
Hold B, press Start	\|	Complete current stage	\|	Jumps to the next "Stage Intro" screen.
Hold B, press Select	\|	Skip current stage	\|	Skips the "Stage Intro" screens. Also works on the "Stage Intro" screens itself.

(UNI) Secret developers stage (added 02.11.21):
There are total 7 stages with indexes 0 to 5 and 7. The index 6 is used for all "Stage Intro" screens. The "Skip current Stage" code mentioned above just increases the stage number and switches to it. The stage with index 7 goes between 1 and 3 by game design. If we use the same code at the stage with index 7 (Level 3, "O.C.P. FACTORY PART 2"), we will jump to the stage with index 8, rather unreached in any other means. This is a secret hidden developers room stage called "UNEXPECTED DEVELOPMENT-RVT TEAM". Note, you couldn't reach it if you just use "Skip current Stage" cheat continuously from the beginnig, because it will skip stage with index 7. Alternatively, use the "Skip current Stage" code on any "Stage Intro" screen to access the stage with index 7 instanty, then use the "Skip current Stage" code to jump to the secret room.

Rock'n! Monster!!

(GEN) Change tiles (added 07.11.21):
Pretty sure it was in a game's manual, but maybe not. The game has two different tiles sets for regular GameBoy and SGB. The SGB mode uses round tiles, the GB uses square tiles. However, you can switch to another one eighter in GB or SGB modes. At the "STAGE SELECT" screen in "1P MODE" or at "VS" screen either in "STORY" or "2P MODE", hold Select and press and hold A. While holding all the buttons wait before the actual game starts. If done right the tiles turns sqare If you play on the SGB and vice versa, on a BW GB the tiles turns round.

(BUR) Game genie (added 07.11.21):

0C2‑14F‑E6A

Re-enables disabled complex "DEBUG" menu at the game boot.

Source: tcrf.net

(BUR) Hidden text (added 07.11.21):
At the end of SGB border data is a mastering tool signature:

NAK1989 S-CG-CADVer1.11 930511 F

Roger Clemens MVP Baseball

(UNI) Title screen cheats (added 10.11.21):
At the title screen, input one of the following codes to get a corresponding effect.

Left, Right, Left, Select, Start, Right, Left	-	Activates special menu that appears before the game and allows you to instantly WIN or LOSE the game by pushing a corresponding button.
Down, Right, Left, Left, Up, Left, Select, Start	-	Press A to go to the main game menu, instead you'll see the instant ending with Staff roll.

Rolan's Curse II (USA), Velious II: Fukushuu no Jashin (Japan)

(BUR) Game genie (added 09.11.21):

01F-FFC-E6A

Re-enables small debug feature. When activated you'll be able to walk through the walls but still get damage from the enemies.

Same Game

(UNI) Same mode unlock stages (added 15.11.21):
At the title screen, hold B, then press Down, Left, Right, Up, Select. A sound will confirm correct code entry. Now you can choose any level in "SAME MODE" up to 20.

(UNI) Tume mode stage select (added 15.11.21):
Start new "TUME" game. At the main menu, enter the "PASSWORD" option and input "4622". Game will start from Stage 1. However, press Select to open the Stage select menu. Choose desired stage number and press either A or Select.

Samurai Shodown (USA), Nettou Samurai Spirits (Japan)

(GEN) Unlock characters (added 14.12.19):
During intro sequence, when the samuri eyes close up is displayed, quickly press Select, Select, Select. A sound will be heard.
Source: urawaza.in, gamefaqs.com

Sanrio Carnival

(UNI) Stage skip (added 17.11.21):
During the game in any mode, except "2P PLAYERS" mode, hold Up + Left then perform the Soft-reset (A + B + Select + Start). Start a new game, select the "STAGE CLEAR" mode (default option) and choose the second tileset ("SQUARES"). Begin the game, instead of "SQUARES" the tileset will change to "SUSHI" set if all done right. From now you'll be able to skip current stage up to the ending by pressing Up + B + Select at the same time.

SD Hiryuu no Ken Gaiden 2

(GEN) Unlock Ryumaou (added 23.11.21):
At the title screen, hold A + B + Down then pres Start. Start a new game, at the top of election screen Ryumaou will be unlocked and available to be selected as playable character. This cheat is unlockable and given to you after beating the game with best result. Alternatively, Ryumaou may be unlocked if you beat all 18 opponents without using continues.
Source: gamefaqs.com

SD Lupin Sansei: Kinko Yaburi Daisakusen

(GEN) Title screen cheats (added 24.11.21):
At the title screen, let the demo sequence to start, then either wait while it over or just skip it to quicky return to the title screen. Then hold Left, press Select, Start, B, A, release Left, hold Right, press Start, Select, B, A. If done right, the game will switch to the STAGE select instantly. The effect is different depending on what demo seqeunce were displayed previously. The list of effects for corresponding demo levels in table below. There is no effect for demo STAGE 5 "BAIKAL" demo sequence.

"ZENIGATA"	-	Extra 10 of all items.
"MAMO"	-	Extra 5 lives.
"CAGLIOSTRO"	-	Start any STAGE from ROUND 6.
"LAMBDA & SIGMA"	-	View ending for a corresponding ROUND. You cannot see the final ending with this cheat though.

Source: urawaza.in, gamefaqs.com

(BUR) Game genie (added 24.11.21):

461‑B4F‑082

Re-enabes developers ROUND select screen. Start a new game, choose STAGE to play, after the STAGE intro the ROUND select screen will appear, select any ROUND from 01 to 10 to start with and press A.

SD Sengokuden 2: Tenka Touitsu Hen

(FIX) Secret message (added 24.11.21):
At the Nintendo logo boot animation, hold Up + A and wait. There is no exit from the message screen, you must reset the onsole to play again.
Source: gamefaqs.com

(UNI) Sound test (added 24.11.21):
At the Nintendo logo boot animation, hold Up + B and wait. Use A or B or Start to play and stop, use D-Pad or Select to select the music. Choose the last option to exit the Sound test.

(BUR) Game genie (added 25.11.21):

050‑33D‑E66	-	Re-enables extra 5th menu option at the title screen. This option opens unused debug Stage select screen. The screen little bit shifted up so cursor does not match exactly the menu positions. The same text used after completing the game when using the CONTINUE option. The list of stages with points and total points count will be displayed.
131‑A2D‑A2A	-	Use this additional code with previous one. This will activate extra 19th menu option which opens the debug Picture test. Note, this option is out of the screen, you need either count until 19 while pressing Down or just put cursor to the upper position and press Up once.

(BUR) Hidden text (added 24.11.21):
The Cart RAM initialization routine uses following scring as a signature:

*KAMIYA NO BAKA*

SD Sengokuden 3: Chijou Saikyou Hen

(GEN) Sound test (added 26.11.21):
At the Nintendo logo boot animation, hold Up + B and wait. Code exactly the same as in 2nd part of this game (see above).
Source: urawaza.in

(BUR) Game genie (added 26.11.21):

04F‑EAE‑E66

Re-enables an extra title menu option which opens the Debug menu. Available options are similar to debug features from 2nd part above, but this time all combined in one common menu. Options are: PICTURE TEST, ENDING, MUSIC TEST (same as with code above), BAD OPT, BAD OPT (crashes the game), STAGE SELECT.

Sea Battle (Europe), Schiffe Versenken (Germany), Bataille Navale (France)

(UNI) Secret message:
Wait for the demonstration starts after the title screen. On the developers credits screen, hold Up + Right + Start. While screen is white, release Right only. You'll see a dedication screen the same as in many other Bit Manager's games.

SeaQuest DSV

(UNI) Stage skip (added 28.11.21):
At the title screen, when the Shark's flipper starts to mofe from left to the right at the bottom of the screen, hold Select + A + Left and wait until Shark appears in the middle of the screen. If done right, during the game, hold B and press Select to skip current stage instantly. Note, if you skip the main underwater submarine stage, you'll get directly to the game ending.

(BUR) Hidden text (added 28.11.21):
There is an unused text for somehow planned "contest" screen at 0x1391F in the ROM. It seems at some point they wanted to run game beating contest with prizes, but haven't done it after all.

  CONGRATULATIONS

YOU HAVE FOUND THE
SPECIAL CONTEST
SCREEN. SEND A PHOTO
OF THIS SCREEN,
ALONG WITH YOUR NAME
ADDRESS, PHONE
NUMBER, AND AGE TO
THE ADDRESS IN THE
MANUAL, WHERE
COMPLETE RULES AND
REGULATIONS ARE
LISTED.

ENTRIES MUST BE
POSTMARKED BY
FEBRUARY 15, 1995.

Serpent (USA), Kakomunja (Japan)

(GEN) Play 1P game with 2 human players (added 29.11.21):
Connect two Game Boys with a link cable. At the title screen, Player 1 must put cursor to "2 PLAYERS" menu option, on Player 2 hold Right + Select + B, on Player 1 hold Left + A and press Start. You must start a new "1 PLAYER" game with CPU player controlled by the human Player 2 instead. With this trick you may beat the game if Player 2 agree to always losing. ;)
Source: makainyumon.web.fc2.com

Shanghai

(GEN) Secret passwords (added 02.12.21):
There is a password menu available during the game. To access it either start a new game, press Select and choose first option "NEW GAME" or at the title screen, hold Select and pres Start to get to this menu instantly. Enter one of the following words to get a corresponding effect.

ZAP	-	A new sound effect for wrong moves.
MAN	-	Reduce Number of Titles.
STF	-	View the credits.
REV	-	Up side down tiles.

Source: gamefaqs.com

Shaq Fu

(BUR) Game genie (added 03.12.21):

01C‑E7F‑E6A

Re-enables secret cheat code. After the boot-up, wait until "CREDITS" screen appears. Hold Right before the screen starts to scroll up. When scrolling begins, you'll hear the sound. Release Right, then hold Left and wait when scroll is stopped. Another sound will be heard. How, quickly, before "CREDITS" screen disappear hold additionally Up and wait for the sound player third time. If done right, the player's fighter turns into CPU controlled, so may you just sit and watch two CPU controlled players fight each other. This does not mean you fighter will beat the game though.

Shikinjou

(UNI) Walk speed change (added 07.12.21):
At the title screen, at players number selection menu, hold Select + B then press either Start to twice the walk speed of the player during the game or A to increase the walk speed 8 times.

Shin Keiba Kizoku Pocket Jockey

(GEN) CRAM clear (added 05.05.21):
Hold Select + Start then power console on and wait for the game logo.

Shippuu! Iron League

(UNI) Password generator (added 29.06.17):
Note, the Time Attack passwords are only for displaying results of your run, the "Stage" field ignored. On the other hand, the "Time" field ignored in Story Mode. However, both fields can be set to any valid value in both password types.

Shougi Saikyou

(BUR) Game genie (added 13.12.21):

01F‑FFC‑E6A

Re-enables some simple debug features. During the game either in QUEST or FREE modes (in FREE play mode vailable only for HARD opponents), while the CPU opponent is thinking in its turn, hold Left and press Start to instantly win current match. Also this code additionally unlocks two more passwords: "あえいうえ" and "えいおあい". The first one is for the final match with GOD. The second one is for ending. Both aren't available in the regular game.

Shuyaku Sentai Irem Fighter

(BUR) Hidden text (added 13.12.21):
There is a small version string at the beginning of the Sound engine at 0x4003 in ROM:

** Ver 6.04 **

Simpsons, The: Bart & the Beanstalk

(GEN) Title screen cheats (added 13.12.21):
At the title screen, input one of the following codes to get a corresponding effect.

Right, A, Down, B, A, Down, Left, A, Down-Stage Select

B, A, Down, B, Left, Up, B, Left, Up, Down-View Credits

Source: gamefaqs.com

Simpsons, The: Bart Simpson's Escape from Camp Deadly

(GEN) Debug cheats (added 15.12.21):
During the game, on Pause, input one of the following sequences to get a corresponding effect.

Right, Up, B, A, Left, A, Down, B, A, Right, Down	-	Simple debug menu. Allows to toggle infinite lives, increase HP and get an extra items.
Right, Up, B, Select, A, Left, A, Down, B, A, Right, Down	-	Full debug menu. In addition to the previous one, you may here toggle various debug display. Adjust window scroll position. Also you may activate ingame debug shortcuts (DBKEYS) to jump back and forth on the level (hold A and press Select or Start correspondingly).

Source: tcrf.net, gamefaqs.com

Simpsons, The: Krusty's Fun House

(GEN) Secret passwords (added 16.08.21):

MICHAEL	-	The secret one. All gates here are not only open but when exit will instantly complete the Level. Also exit from the main door will show the Ending Staff roll.
MCBAIN	-	Level 2 (unlockable)
MILHOUSE	-	Level 3 (unlockable)
CMBURNS	-	Level 4 (unlockable)
PRINCESS	-	Level 5 (unlockable)

Source: gamefaqs.com

(BUR) Hidden text (added 16.08.21):
There are two lists of "Krusty's clelarance codes" one at $BE9B and the one at $BEE3. The first one is to display said codes, the second one is to check codes when input at the title screen. As may be seen, the first one list start with "JOSHUA", which is should be the Level 1 code, but since there is no codes for the Level 1 at all, it is unused here. The second list starts with "MICHAEL" instead which is a secret not-unlockable code (see list above).

Sky Kid (Namco Gallery Vol.3)

(FIX) Instant recover (added 18.12.21):
During the game, after hit by the enemy or enemy bullet, before hitting the ground quickly hold Up and mash A or B buttons rapidly to instantly recover and continue your flight. However, every hit you get increases the amount of A or B pressings needed to recover. At the beginning, you need only 2 pressing, then 3, then 5 and so on. After all, this trick will need too much pressings than you may do until hit on the ground, especially in heavy enemy fire.
Source: gamefaqs.coom

Smurfs, The

(FIX) Practice mode (added 22.12.21):
When you beat the game, after the Staff roll the "PRACTICE MODE" screen will be displayed. With this you may select to play any level excluding 12th. Also note, after beating the game the difficulty setting automatically increased to harder difficulty, so if you previously played the game on "NORMAL" then after selecting the level you will play on "HARD" mode.
Source: tcrf.net

(UNI) Secret passwords (added 22.12.21):
For some weird reason, for 12 game levels there are only 2 passwords given to you by the game itself. However, there are a set of secret passwords to access any game stage or bonus, including the game ending. Similar passwords may be found in the NES version of this game as well. All they starts with the same three characters: "BXMx", where "n" characters from "B" to "X". "B" obviously starts with "ACT 1" so it is redundant. Here is the complete list:

BXMC	-	Act 2 "The Bridge"
BXMD	-	Act 3 "The River Smurf"
BXMF	-	Act 4 "The Swamps"
BXMG	-	Boss 1 "Snake"
BXMH	-	Act 5 "The Sarsaparilla Fields"
BXMJ	-	Act 6 "The Montains"
BXMK	-	Act 7 "The Flight on a Stork"
BXML	-	Act 8 "The Old Gold Mine"
BXMM	-	Act 9 "Inside the Volcano"
BXMN	-	Boss 2 "Dragon"
BXMP	-	Act 10 "The Sledge Race"
BXMQ	-	Act 11 "The Cliff"
BXMR	-	Act 12 "Gargamel's Manor House"
BXMS	-	Final Boss "Gargamel"
BXMT	-	Ending
BXMV	-	Bonus "The Dam"
BXMW	-	Bonus "The Mushrooms"
BXMX	-	Bonus "The Bubbles"

Smurfs 2, The (Smurfs The World)

(GEN) Cheat mode (added 22.12.21):
Enter "VFZF" as a password. Start a new game, now any time on pause, press B to refill lives and HPs. Or hold A and press Start to skip current level up to ending sequence.
Source: gamefaqs.com

Smurfs 3, The: The Smurfs Nightmare

(GEN) Stage skip (added 22.12.21):
At the title screen, input Left, Up, Down, Down, Right, Up, Left. A sound will confirm correct code entry. During the game press Select to skip to next Stage.
Source: gamefaqs.com

(BUR) Hidden text (added 22.12.21):
There is a hidden copyright string in the middle of Sound engine at 0x8B23 in ROM:

GBS 3.4 (C) 1990 - 1997 Alberto Jose Gonzalez & Bit Managers S.L.

Also there is a placeholder text at the end of the same Sound engine:

Final de la rutina de musica
Final de la rutina de musica

Snow Bros. Jr.

(GEN) Invincibility (added 26.12.21):
At the title screen, hold A + B + Down + Left then press Start.
Source: urawaza.in, gamefaqs.com

(FIX) Stage select and Invincibility (added 26.12.21):
At the title screen, hold B + Select + Up, then press Start. Choose desired Stage then press Start to play it. If you additionally hold A + B before pressing Start you begin selected Stage with activated invincibility.
Source: urawaza.in, gamefaqs.com

Soccer Mania (USA), Soccer Boy (Japan)

(GEN) Player team select (added 27.12.21):
At the team select screen, hold B + Select to choose your own team instead of CPU's.
Source: urawaza.in, gamefaqs.com

(GEN) Invisible CPU team (added 27.12.21):
At the title screen, input Up, Up, Down, Down, Left, Right, Left, Right, B, A, then start a new game. Whatever CPU team you select, all CPU players will be invisible.
Source: urawaza.in, gamefaqs.com

(UNI) Unlock DARK team (added 27.12.21):
At the title screen, press and hold B, while holding it hold also Select, now hold A as well, do not release all previsou buttons, hold Up, now, release only Up and then hold Left instead, Finally, with all these buttons held, press Start. At the team selection screen, the first team icon will change to a Jolly Roger, you may select it as CPU team. All players of this team during the game are DARK. Also note, with this code you cannot select your own team.

SolarStriker

(GEN) Harder difficulty (added 27.12.21):
Beat the game first, after the ending credits, return to the title screen. The message "PUSH START BUTTON" will change to "PUSH SELECT BUTTON". Push Select and you'll start the game on hadred difficulty with more and harder enemies.
Source: gamefaqs.com

Soldam

(UNI) Title screen cheats (added 28.12.21):
Input one of the following sequences at the title screen to get a corresponding effect.

Up, Down, Left, Right, Select, Start	-	Ending and Credits.
Down, Select, Up, Left, Select, Right, B	-	Instant Stage select in regular game mode. On pause press A or B to choose another level t o play.
Down, Up, Down, Up, Select, B	-	Sound test.

(UNI) Easter message (added 28.12.21):
Do the "Sound test" cheat at the title screen first. Then set the BGM/SE index 02 and press A once. Set BGM/SE index 19 and press A once more. Now input following series of codes. I split the long long code to a shorter fragments to be easier to input: Up, Up, Down, Down, Left, Left, Right, Right, Select, Select,
Up, Up, Down, Down, Left, Left, Right, Right, B, B,
Up, Down, Left, Right, Select,
Up, Down, Left, Right, B,
Select, Right, Left, Down, Up,
B, Right, Left, Down, Up,
Select, Select, Right, Right, Left, Left, Down, Down, Up, Up,
B, B, Right, Right, Left, Left, Down, Down, Up, Up and finally press Start. If done right, the screen with some kind of secret information about one of the game programmers will be displayed in the same style as the ending staff roll. Its STAFF roll name is Sakasita "HIROPI" Yutaka. This message name is "KASAHARA HIROPI". Judging from accessing method, this message not intended to be someday revealed to the public.

Solomon's Club

(GEN) Sound test (added 04.01.22):
At the title screen, hold Up + Left + A + B + Select then press Start.
Source: makainyumon.web.fc2.com

(BUR) Game genie (added 04.01.22):

006‑97D‑E65

Replace the "SOUND TEST" screen with the unused unreferenced "CONFIG[U]RATION" screen. Here you as well may listen to the music and sounds, but also set the levels complete flag (either the with secret item ("COMPLETED!") or without ("COMPLETED?")). If you set all levels as "COMPLETED!" you may play the "SOLOMON" levels. Also here is the invincibility toggle option.

Soreyuke!! Kid

(FIX) Stage select (added 05.01.22):
At the title screen, hold Down then input A, B, A, B. Every time you press the button a sound will be heard. The number will appear above the "PASS/WORD" menu option. Use D-Pad buttons to select any stage. For some reason, the "STAGE SELECT" is accessible also at the "PASSWORD" screen with just Select button. It seems they kept it for debugging purposes there but forgot to remove in the release version.
Source: tcrf.net

Space Invaders

Western SGB Rereleases:

(GEN) Switch SGB border (added 07.01.22):
In SGB mode, during the game, press Start to pause, press A to toggle between two SGB borders: one for top-down arcade style automat, and one for coctail machine style.

Japanese version:

(UNI) Self-guided UFO missile (added 06.01.22):
During the game, when UFO appears, try to shot it with the B button instead of A with additionally Select + Down held. If done right, the shot turns into a self-guided missile and will aim to the UFO automatically.

(UNI) Score advance table Easter egg (added 06.01.22):
At the title screen, before "SCORE ADVANCE TABLE" appears for the first time, hold A + B. The animation of the Invader fixes the "Y" letter will change. It will move faster and other Invaders in the list will be animated.

(UNI) Title screen cheats (added 06.01.22):
At the title screen, any time input one of the following button sequences to get a corresponding effect. You cannot enter more than one code here. A sound will be heard if code input corectly.

A, Right, B, Up, A, Left, B, Down	-	Inverted palette.
A, B, Right, Left, Up, Down, Right, Left	-	Invincibility. However, you still may have a Game Over if any Invader hits the ground.
Right, Left, Right, Left, Right, Left	-	One of three types of enemy shots will be self-guided aiming to the player's ship.

(UNI) Ingame cheats (added 06.01.22):
Any time during the game, except special cases described below, input one of the following button sequences to get a corresponding effect. You cannot enter more than one code here or if you already enabled one of first two codes at the title screen as described above. Also a sound will be heard if code input corectly. There are two significant rules common for all these codes. First, you must input a code on odd stages, then you get the corresponding effect on the next, even stage. When the game goes from the even to the odd stage again the cheat effect will disappear. But if you enter the code at even stage you just can't get anything on the next stage except one thing (this is the second rule of these cheats): every time the game transitions from even to odd stage and any of the following cheats is activated the game will increase some internal counter. This counter, when exceeded some value will cause the difficulty increase. If you use cheats more than 9 times, the enemy homing bullets will be activated, just the same as third cheat at the title screen (see above). But if you use cheats more than 49 times, it will be bullet hell.

Start, A, B, B, A, Select, Start	-	Next stage enemies will be all Invaders for 10 pts.
Up, Down, B, Down, A, Select	-	Next stage enemies will be all Invaders for 20 pts.
Left, Right, Up, Up, Select, A, Select	-	You can only input this code when UFO appears on the screen. Next stage enemies will be all Invaders for 30 pts.
Up, Up, Right, Left, Down, Down, Select	-	Before input this code you must shot exactly 15 bullets. When done, the enemies won't slide down, so you can't get a game over. Additionally, this will also increment internal cheats using counter by 2 instantly. So you may get the bullet hell even faster with this one. Use it wize!

Spanky's Quest (USA, Europe), Lucky Monkey (Japan)

All versions:

(GEN) Secret passwords (added 29.08.18):

0117	-	Sound test.
0119	-	Stage select.

Source: gamefaqs.com

Japanese version:

(GEN) Invincibility (added 29.08.18):
During the game, pause it with Start then press A, A, A, A, B, B, B, B, A, B, A, B, A, B, A, B.
Source: makainyumon.web.fc2.com

Speedball 2: Brutal Deluxe

(BUR) Hidden text (added 08.01.22):
At the beginning of the ROM there is a hidden copyrights text:

COPYRIGHT SPIDERSOFT 1991

Also there is a development leftover file list text at 0x54EA in ROM:

SPEED.ROM
MSPR5.BKS
MSPR5.CHS
PITCH.CHS
MENU.CHS
GYM.BKS
GYM.CHS
FACES.BKS
FACES.CHS
S2MEN.BKS
S2MEN.CHS
SBMISC.BKS
SBMISC.CHS
LASC.CHS
SCORES.BIN
CUPS2.CHS
CUPS2.BKS
SBMUSIC.BIN
PITCH.MRX
TMATT.BIN

Source: tcrf.net

Speedy Gonzales (USA), Soreyuke! Speedy Gonzales (Japan), Sonic 6 (Pirate)

(BUR) Game genie (added 05.01.22):

002‑D7F‑E69 (for the US version)
002‑D9F‑E69 (for the Japanese version)

Activates some debug routine. Press Select any time to jump to a screen with messagee "RE PORTING" then go to undefined RAM code. This is most probably were used during developement stage for debugging purposes.

Spider-Man and the X-Men in Arcade's Revenge

(UNI) Cheat mode (added 01.11.21):
Start a new game. In Stage 1, hold Select + B, then jump 10 times. Make sure you full landed before another jump in order to trigger this cheat. If done right, a few options now available during the game. Note, this is common kind of cheat features used by programmer Cary Hammer (Unexpected Developement/Visual Concepts) in its games.

Button code	\|	Effect	\|	Notes
Press Start	\|	High jump	\|	Pause mode not available anymore.
Hold A, press Select	\|	Free walk mode	\|	You now can go throught the walls and move character to any position of the level. Hovewer the vertical movements very slow.
Hold Select, press Up	\|	Activates invincibility	\|	-
Hold B, press Select	\|	Skip current stage	\|	After the last Stage 6 you will return back to the Stage 1.

Spirou

(GEN) Stage select (added 15.03.22):
During the game, press Start to pause it, then input Down, Down, B, Left, Right, A, Down, Up, A.
Source: gamefaqs.com

Splitz (USA, Europe, Japan), Uchiiwai: Kyoudaijingi no Puzzle Game (Japan Rerelease)

(UNI) Infinite lives (added 20.08.18):
At the license screen, press Up, Right, Down, Left, A, Start. If done right, the screen will flash for a half of a second. Note, when you commit Suicide manually (Select on pause) you'll get an instant game over even if cheat is active.

Sports Illustrated: Football & Baseball

(BUR) Game genie (added 17.03.22):

004‑14F‑C4D

Re-enables the simple debug feature to view ingame animation sequences. Press any button at the title screen when initial animations and license screens are displayed. Then press one of the buttons except Start to display a corresponding ingame animation sequence. Press Start to return back to the game. Note, when debug is activating and waiting for the input the screen will flicker with white and black stripes.

Sports Illustrated: Golf Classic (USA), Golf Classic (Europe)

(UNI) Soft-reset enable (added 04.06.17):
At the "ADDITIONAL TESTING" screen, press Select + Left. This will enables the Soft-reset feature. To use it during the game, press A + B + Select + Start. Weird enough this feature need to be hidden under the button code, since most of the GB games has this functionality enabled always by default with just little variations.

(UNI) Cheat mode (added 04.06.17):
At the License screen, quickly (in less than 8 seconds) hold A, press Right, release all, hold A + B, press Up, release all, hold B, press Left, release all and hold A + B, press Down. A sound will confirm correct code entry. Cheat mode enables a lot of new features:
During the game hold Select, press B to skip to the next hole instantly.
When ball is falls into the water, there is a different icon is displayed ("H2O").
When "FAIRWAY" menu is displayed, there is an additional animated character pointing to the menu options from the right side of the screen.
Also, var $D174 set to 2 instead of 1 by default. Used at the game start and before any "FAIRWAY" menu. Investigate.
At the Game select menu hold Right before selecting any option, var $D174 will be set to $F0. Investigate more.

(UNI) Secret courses (added 04.06.17):
First, enable the Cheat mode as described above. Then you need to press a particular buttons to skip next four screens after the License screen. At the title screen, when the scroll is stopped, press Select. At the "DEVELOPED BY" screen, press Start. At the "MUSIC AND SOUNDS BY" screen, press B. And finally, at "EXECUTIVE PRODUCER" screen press A. From now there are two extra Secret courses will be available. Note, two first courses now has a different names at the Course select screen. For two Secret courses the Hole select and Hole skip functions are disabled by default. To enable the Hole select mode, hold Left before selecting the player mode. To enable the Hole skip mode, hold Right before selecting the player name.

Spot

(UNI) Secret message (added 21.03.22):
Before the game, go to "OPTIONS" and change "NO TIMER" option for Player to any other value (better set "5 SECS"). Start a new game, when Player's turn in progress and timer counts down, hold Up + Left + Select and wait timer reaches zero and CPU get its turn. When done, finish current match with any result. You may either win or immediately loose, no matter. After a "WON" animation, the title screen will re-apperas. Now watch carefully when the copyright text appears and start to scroll up. There will be additional text above it: "Code: MIKE FOLLIN" quickly disappearing under the Spot picture.

(BUR) Hidden text (added 24.03.22):
There is a hidden copyright text at the beginning of the game ROM:

SPOT  programmed by Mike Follin, graphics by Mark Wilson, music by Geoff Follin at Software Creations ROM developments Ltd. Manchester,England.

Spot: The Cool Adventure (USA, Japan), McDonaldland (Europe)

(UNI) Cheat mode (added 17.09.18):
Start a new game. In Difficulty selection Stage, hold B, then jump 10 times. Make sure you full landed before another jump in order to trigger this cheat. If done right, a few options now available during the game. Note, this is common kind of cheat features used by programmer Cary Hammer (Unexpected Developement/Visual Concepts) in its games.

Button code	\|	Effect	\|	Notes
Press Start	\|	High jump	\|	Pause mode not available anymore. The one bonus high jump with Select still available in this case.
Hold A, press Select	\|	Dash forward	\|	Throws character forward for a couple of tiles without collision tests. Use it in conjuction with code above to advance faster through the level.
Hold Select + A, press D-Pad	\|	Free walk mode	\|	Works weirdly sometimes may stuck in the wall. Also works on the owerworld mode but may glitch even worse.
Hold Select, press Up	\|	Activates invincibility	\|	-
Hold B, press Start	\|	Complete current stage	\|	-
Hold B, press Select	\|	Skip current stage	\|	When used at the Difficulty selection Stage jumps to very end of the game, since the stage index of this screen is previous to the Final Stage and Ending.
Hold Select, press Left	\|	Display developers screen	\|	Only accessible at difficulty selection stage.

Spud's Adventure (USA), Totsugeki Valations (Japan)

(UNI) Secret passwords (added 22.03.22):

PATESUN (for the US version)
OHMYGOD (for the Japanese version)

Start from Map index 120, which is next to the boss room of Stage 3. When you die here, you'll brought back to the beginning of this Stage at map index 83. This is secret code, no characters in this game will give it to you.

BANCHOU (for all Versions)

Select any individual map to start to play with. There are 196 maps in this game (0-195), map with index 196 is a special one (see below "DEBDEDE"). Also following chart will show what map indexes used when you starting the game from the regular passwords:

BABAGEC (for the US version) CABBAGE (for the Japanese version)	-	Map 41.
DUBROCK (for the US version) BURDOCK (for the Japanese version)	-	Map 83.
PANCHIS (for the US version) SPINACH (for the Japanese version)	-	Map 127.
BANYEOS (for the US version) SOYBEAN (for the Japanese version)	-	Map 175.

Source: gamefaqs.com

DEBDEDE (for all Versions)

Start the game from the beginning with max 8 hearts, 6 lives and at 6th exp level. You may activate this bonus also at the map select screen (see above "BANCHOU") if set the map index to 196.

Square Deal: The Game of Two-Dimensional Poker

(UNI) Custom cards shuffle (added 24.03.22):
At the "STARTING THE GAME" screen press and hold Start + Up + A, wait for cards being shuffled, then release the button. If done rights, a better distribution of the cards will be tossed to the field so you easily may beat the game with higher scores.

Star Hawk

(BUR) Unused text (added 25.03.22):

C82‑7CF‑80B+552‑7DF‑B33

Replace the main menu message to an early unused credits screen with developers names. Note, this screen has the game used another name "INTRUDA" and year is 1991 instead of 1992.

Star Trek: 25th Anniversary

(FIX) Free warp (added 29.03.22):
During thee game, on the space flight levels, hold Select then press Left. This however works only once for every flight sequence.
Source: gamefaqs.com

(UNI) Cheat mode (added 28.03.22):
At the Continue option, enter "3096.0" as a "STARDATE". The message "INVALID STARDATE" will be diplayed, then return to the Main menu. Start a new game. If done right, a few options now available almost any time (if not noted separately) during the game. Note, this is common kind of cheat features used by programmer Cary Hammer (Unexpected Developement/Visual Concepts) in its games.

Button code	\|	Effect	\|	Notes
Hold B, press Right	\|	Dash forward	\|	Works only on space flight stages.
Hold B, press Left	\|	Toggles invincibility	\|	-
Hold A + B, press Up	\|	See the ending	\|	-
Hold B, press Down	\|	Exit space flight stages	\|	-
Hold B, press Select	\|	Skip current stage	\|	May be used also at the briefing screens.
Hold A, press Left	\|	Replace asteroids with Cows and Burgers	\|	Works only on space flight stages of "ASTEROID FIELD" type, affects only two kinds of larger asteroids.

Star Trek: The Next Generation

(GEN) Secret passwords (added 30.03.22):
Enter word "OVERRIDE" as a Password and press A, nothing has to be happen here for the first look. However, pres B to exit back to the title menu, start a new game and when Picard send you on a mission, press Up to select another one.
Source: gamefaqs.com

Street Racer

(FIX) Secret passwords (added 06.04.22):
At the "OPTIONS" screen, input as a "CUP PASS" one of the following words. Note, all there are unlockable after beating one of the subsequent "CHAMPIONSHIP" games, except the "CUSTOM CUP".

JXPSVW	-	"SILVER CUP" unlock (beat "BRONZE CUP" to get this password).
BEFQMR	-	"SILVER CUP" and "GOLD CUP" unlock (beat "SILVER CUP").
HJACUY	-	"MEGA CUP" unlock (beat "GOLD CUP"). Note, to play this after entering the password, select "GOLD CUP" at "CHAMPIONSHIP" menu. This will add an extra "SPACE" Stage to the end of the "CUP". The same extra Stage also will be available in "PRACTICE" and "HEAD TO HEAD" modes as 9th selectable Stage.

Source: gamefaqs.com

Street Rider (Unlicensed, Sachen 4-in-1 Vol.1)

(BUR) Game genie (added 13.05.16):

5C2‑28F‑7F6+F72‑27F‑F7B

Unless many other games by Commin, this one has a fully functional "Creatronic" logo, which may be easily re-enabled by these codes.

Sumo Fighter (USA), Sumou Fighter: Toukaidou Basho (Japan)

(FIX) Special mode (added 07.04.22):
At the title screen, input Up, Up, Down, Down, Left, Left, Right, Right, a sound will confirm correct code entry. This will cause some dirrecences in prize drop behaviour. In this mode, the enemies does not drop any random prizes anymore. Instead, all static objects like rocks that doesn't have any prizes before, will drop random prizes instead. Static objects with fixed predefined prizes are left untouched.
Source: gamefaqs.com

Super B-Daman: Fighting Phoenix

(FIX) Secret characters body (added 25.03.22):
At the title screen, input one of the following sequences to unlock following character's body type. To wear a new character body after input the code, go to main menu, select "ＪＢＡけんきゅうじょ". If done right, you'll see a grettings screen. Then select first option ("change character"), and then second option "select body". Note, in the following codes instead of Right may be used any D-Pud button.

Select, Select, Select, B, B, B, Right, Right, Right	-	"Ｗワイバーン" ("Wyvern").
Right, Right, Right, Right, Right, Right, Right, Select, Select, Select, Select, Select, Select, Select, B, B, B, B, B, B, B	-	"Ｓスフィンケス" ("Sphinx")

Source: urawaza.in

(BUR) Game genie (added 14.05.17):

013‑09F‑E6A

Enables a couple of debug features:
Any time during the game, hold Select, then press B to stop the game. Press B to unhold it back.
Hold A + B + Select, then press Start to soft-reset the game.
During the game in "BiDa" mode, press Select to enter the "TEST MODE SET" where you can change the parameters of the current stage.
At the Mode select menu, select the "Caravan mode", hold Select and press A or Start to see the ending.
During the game in the "Caravan mode", hold Select and press Start to instantly return back to the Mode selection menu.
In "JBA" mode, enter the "BINGO" screen, press Start to instantly see the item at the corresponding bingo position.
At the "JBA" mode select screen, put cursor to "Data Save" option, hold Select and press A or Start to enter the Bingo field edit mode.

Super Bikkuriman: Densetsu no Sekiban

(UNI) Sound test (added 14.04.22):
At title menu, enter "OPTION" then set cursor to the "PASSWORD" option, hold B and press Left.

(BUR) Game genie (added 14.04.22):

002‑BEF‑E6E

Replaces the Pause mode on Select with rather disabled debug routine. With this code enabled, reset the console, then any time press Select to skip to the next system routine instantly. This will cause some glitches sometimes (when system routine record table is empty, or some system routines need additional initialization before start), but there are about 80 various system routines. If you press Select during the game for example, you'll instantly skip to the next level/stage.

Super Black Bass (USA), Super Black Bass Pocket (Japan)

All versions:

(GEN) Sound test (added 18.04.22):
Start a new game. On boat, pause the game with Start, then press B 7 times then unpause.
Source: gamefaqs.com, tcrf.net

(UNI) Debug mode (added 18.04.22):
At the title screen, when "PRESS START BUTTON" flashing on the screen, input Select, Up, Down, A, Left, Start. When starting a new game the message "DEBUG MODE/DEV STAFF ONLY" in Japanese will be displayed. During the game, hold Select and press one of the following buttons to access a corresponding debug option. Full list of the features can be seen in the table below. Similar Debug modes can be found in some other games by the same developer (Starfish). Note, the US version also have the same debugging functionality as in the Japanese version but all texts are untranslated.

A	-	Current game status info screen.
B	-	Continue holding the B button to fast forward the game.
Start	-	Make record of the current game time and map position, being used in other place of the game, need to investigate more. The spots list is displayed in the bottom-right corner of the status info screen mentioned above.
Up	-	Fish selection screen. Probably used to select currently available fish to catch.
Down	-	Various debug options, like Stage map shortcut, Mesage test, Sound test, Objects test, current time, weather and other game parameters select.
Left	-	Fish instant catch menu. There are two options: random fish and selected by parameters. Use one of them to get the fish without luring.
Right	-	Bait selection menu. Set the amounts of each type of bait or see the bait storage.

Japanese version:

(UNI) CRAM clear (added 19.04.22):
Hold Up + Left + B before powering the console up, then wait for the "Starfish" logo appears.

Super Black Bass Pocket 2

(UNI) CRAM clear (added 19.04.22):
Hold Up + Left + B before powering the console up, then wait for the "Starfish" logo appears.

(GEN) Sound test (added 19.04.22):
Start a new game. On boat, pause the game with Start, then press B 5 times then unpause.
Source: gamefaqs.com, tcrf.net

(UNI) Debug mode (added 18.04.22):
At the title screen, when "PRESS START BUTTON" flashing on the screen, input Select, Up, Down, A, Left, Start. When starting a new game the message "DEBUG MODE/DEV STAFF ONLY" in Japanese will be displayed. This game being heavily based on the previous part contains exactly the same debugging features like game above in the database - "Super Black Bass". Use it as a reference for this game as well.

Super Breakout (Single game cart, Arcade Classic)

(UNI) Cheat sequences (added 30.06.16):
Any of this cheats can be entered any time in any game either on the title screen or during the game. After entering the sequence press Select to activate a corresponding cheat.

A, B, A, B, A, B, A, B	-	Show a smiling baby picture with a funny sound.
B, A, B, A, B, A, B, A	-	Show something creepy with a creepy sound as well.
Up, Down, Left, Right, Up, Down, Left, Right	-	This has effect in the Battle Zone game. During the game, as you scroll the background, a message will appear: "AS YOU FIND WHAT YOU NOW SEEK IS MORE INLAND AND WHAT YOU ONCE KNEW WAS SOLID IS JUST SHIFTING SAND".

(UNI) Sound editor (added 30.06.16):
At the title screen of the Super Breakout game, press Up + A + B. You'll be able to set any sound registers parameters and play it by press Start.

Super Chase H.Q.

(BUR) Game genie (added 25.08.16):

088‑F2F‑082	-	Re-enables the Stage select mode at the title screen upon starting a new 1p game.
0D8‑F2F‑082	-	Re-enables the Sound test mdoe at the title screen upon starting a new 1p game.
469‑06F‑D51+679‑07F‑C47	-	Show an unused "SIO ERROR" screen instead of Options menu.

Source: tcrf.net

Super Chinese Land 3, Super Chinese Land 3' (Japan Rerelease), Super Chinese Land 1.2.3' (Compilation)

(FIX) Secret passwords (added 02.05.22):

さあこい	-	00 Maxed out stats and gold, start from the near the end of the game. All needed quest items are included.
まかしとき	-	01 Maxed out stats and gold, start from the beginning. Source: urawaza.in
おはなし	-	03 Message test A.
おけつ	-	04 Ending. Source: urawaza.in
ひみつ	-	05 Visuals test A. Source: urawaza.in
しねま	-	06 Cinema test.
かいもの	-	07 Shop test.
のせて	-	08 Ride test.
したい	-	09 Sleep mode test. Source: urawaza.in
おそい	-	0A Save point test. Source: urawaza.in
みせて	-	0B Info screen test. Source: urawaza.in
みたな	-	0C Password decode test.
みせな	-	0D Password encode test.
たたかう	-	0E "Battle test" does nothing.
あいなめ	-	0F Two-players mode on the same console. Hold B to control another player.

(BUR) Game genie (added 03.05.22):

3CC‑6B9‑C47+3CC‑6D9‑C47

Re-enables a secret password for the Sound Test. Secret password will be "のののの".

Super Chinese Fighter GB

(GEN) Extra ability slots (added 27.04.22):
At the title screen, hold Down + A and pres Start. You'll hear a sound. Now, start the game and you'll have 5 slots to put special moves in instead of the normal 3.
Source: gamefaqs.com, ReyVGM

Super Hunchback

(UNI) Test mode (added 10.06.16):
At the title screen, hold Select, then press Right, Right, Left, Left, A, B, Up, Down. You'll be able to select any stage, see the ending and obtain an infinite lives.
Source: tcrf.net

Super James Pond

(UNI) Cheat mode (added 04.05.22):
At the "PUBLISHED BY" screen, input A, A, A, B, A, B, A, A, A, A, B, A, B, A then press Select. A sound will be heard. Start a new game. All doors are unlocked now. Press Select any time to refill HP to maxmum.

(BUR) Game genie (added 04.05.22):

C92‑F7E‑D5C	-	Replace text at "CONVERSION BY" screen to unused developers copyrights, intended to be displayed at some point at the development stage when some portions of the game data is changed. In the final code in both cases there will be the same default "CONVERSION BY" message. An unused message is partially unreadable because later graphics patch above the screen. The text must be read as "PROGRAMMED BY CLIVE TOWNSEND\ORIGINAL CONCEPT BY CHRIS SORELL".
052‑32E‑4C9+012‑70E‑3B1	-	Replace the title screen text with rather unused error message drom the developer. "PLEASE CONTACT STEWART AT DOS".

Super Mario Land

(GEN) Continues (added 06.05.22):
After a game over you'll be rewarded with one continue for every 100000 scores you colleted up to 9. Return to the title screen and press Select to set cursor to "CONTINUE" option then press Start. All previously collected continues will be added to a new ones. However, continues are reset to 0 when you complete the game.

(GEN) Expert mode (added 06.05.22):
Complete the game once. Return to the title screen, the menu cursor will change to Mario's head indicating the game is changed.
Source: gamefaqs.com

(GEN) Stage select (added 06.05.22):
Complete the game twice. Return to the title screen, there will be a numbers to the right of the title menu displaying currently selected world number. Press A to change it and press Start.
Source: urawaza.in, gamefaqs.com

Super Mario Land 2: 6 Golden Coins (USA, Europe), Super Mario Land 2: 6-tsu no Kinka (Japan)

All revisions:

(GEN) Easy mode (added 12.05.22):
At the save slot selection screen (with pipes) press Select.

Revision 1.0:

(FIX) Instant demo select (added 12.05.22):
At the title screen, hold one of the combinations from the table below then press Select to instantly start the corresponding demo sequence without need to wait for it. This feature were disabed from all later revisions in all regional versions for some reason, so this will work ony in the very early produced carts.

Left	-	Demo sequence 1.
Left + A	-	Demo sequence 2.
Left + B	-	Demo sequence 3.
Left + A + B	-	Demo sequence 4.

Source: gamefaqs.com

Super Mario Land 3: Wario Land

(GEN) Simple debug mode (added 17.05.22):
During the game, press Start to pause it, then press Select 16 times. A small frame will appear at the game's HUD. Hold B and use D-Pad buttons to change values of the parameters on the HUD. Put cursor in the leftmost position, hold A + B and press Left to highlight the Wario's head. In this case, when unaused wario will upgrade it's appearance on one stage at once. To upgrade more, enter pause mode and repeat all manipulations.
Source: tcrf.net

(BUR) More debug functions (added 17.05.22):
If using emulator, set RAM address 0xA8C7 to 01. This debug mode will have permanent effects during the game:
- At Course number screen there a number will be displayed indicating the level ID, use D-Pad buttons to cycle throught all valid ID level numbers, press A or Start to play it. Note, if you press here Select 10 times, the extended debug features will be disabled.
- During the game, press Select to instantly upgrade Wario's appearance.
- On Pause, press Select to enable Free-walk mode; press Down + B and press Start to jump directly to the ending; the simple debug code also available here, but with one difference, highlighting the Wario's head will complete current level instead of upgrading the Wario's appearance.
Source: tcrf.net

Super Momotarou Dentetsu

(UNI) CRAM manage (added 17.05.22):
At "GAME START"/"CONTINUE" menu, hold Up + Left + Select then press B. Instead of starting a new game by default you'll see the Save data management menu. Here you may view saved data or do a backup copy of it.

(UNI) All CPU controlled players (added 17.05.22):
Setup a new game. Wait for the final message after the game is asking wether to save game data to the cartridge. At this message press Up + Select + B + A at the same time. Another question will appear: "WOULD YOU LIKE TO TURN ALL PLAYERS TO BE CPU CONTROLLED"? Answer "YES" and just watch the game. Note, you actually can do the same any time dring the game by pressing Select and shoosing the second option where you may set the CPU control to any players.

(UNI) Secret names (added 17.05.22):
Start a new game with exactly 3 human controlled players (first, choose "にんげん　３にん", then choose "おのゆーた　なし"). When asked for a names, input "ももてつ" as a name for the "PLAYER 1". Next, for "PLAYER 2" input one of names in the table below for a corresponding effect. And finally input name for "PLAYER 3" as "しつ". Note, for names with less than 4 characters you need to press either Start, Select or choose "おわり" after entering first two or three letters. Finally, complete the game setup with selecting any years number, then confirm all settings and save the game ("はい" twice) and after a short cutscene you'll see one of three test screens:

"おんがく"	-	Sound test
"びじゅつ"	-	Picture test
"としょ"	-	Message test

(BUR) Hidden text (added 17.05.22):
There is a version string at the beginning of the ROM:

DMG SYSTEM PROGRAM  Ver 1.01  1989,90 LU.

Super Momotarou Dentetsu II

(GEN) Credits (added 25.05.22):
Start a new game. Open ingame menu, select last option "そのた" ("MISC"), then first option "ちいきデータ" ("MAP DATA"). Go up and little left to the "SADO" island, then click with A on the squid just to the right of it.
Source: urawaza.in

Super Pachinko Taisen

(GEN) Sound test (added 26.05.22):
At the title screen, then "PUSH START" message is displayed on the screen push quickly all D-Pad in that order Up, Right, Down, Left three times. Note, the better way with no rush is just to hold previously pressed button before pressing the next one, then release the previous one and keep the current one held and so on.
Source: urawaza.in

Super Robot Taisen

(UNI) Extra Mind points (added 27.05.22):
During the game, at the human player's turn, press A + B + Start at the same time. This will set "MIND" ("せいしん") parameter of party leader to 9/9 instantly. It seems this is some kind of developement leftover. "MIND" parameter seems does not needed during the actual battles, but somewhere between them.

(BUR) Hidden text (added 27.05.22):
The RAM initialization routine uses following string at 0x003DD0 as a memory signature:

WINKY SOFT

Super Scrabble

(UNI) Dedication screen 1 (added 30.05.22):
Boot up the console, at the very first license screen, hold Select and quickly input A, B, Up, Down, Left, Right, A, B. If done right, the screen turns white. From now there is no rush, you may release buttons and relax or just continue. Input the same sequence one more time while still holding Select. A dedication screen with list of people related to the developer or the developement will appear.

(UNI) Dedication screen 2 (added 30.05.22):
Access the "Dedication screen 1" as described above, when done press A + Select + Start at the same time. Another screen with large message "CHRISTINE" will be displayed. To exit from both screens input regular Soft Reset code (A, B, Select, Start).

(BUR) Hidden text (added 30.05.22):
At the beginning of the ROM there is a hidden credits string:

GAME BOY SUPER SCRABBLE (C)1990 MILTON BRADLEY DEVELOPED BY IMAGINEERING, INC. PROGRAMMER: CHUNG S. LAU

Source: tcrf.net

Super Street Basketball 2

(BUR) Game genie (added 31.05.22):

04C‑4B8‑E66+04C‑558‑E66

Activates fourth difficulty mode at the "OPTIONS" screen. Note, this mode called "EXPART" which is obviously misspelled "EXPERT" and does not used in the final game.However some coding rather unfinished still in the ROM.

Superman

(BUR) Hidden text (added 31.05.22):
There is a copyright text at 0x01C02A at the beginning of the sound engine:

MUSIC & SFX - by Elmar Krieger

Swamp Thing

(BUR) Game genie (added 01.06.22):

D93‑B9F‑D57+6B3‑BAF‑192

Re-enables somehow an unused and seems to be unfinished password screen. There is no proper font data for this screen, the header is "ENTER START ADDRESS" (couldn't see this with this code) but you may input at least 8 letters. Routine actually does nothing and just return to the game when Start is pressed.

Sword of Hope, The (USA, Europe), Selection: Erabareshi Mono (Japan)

US version:

(BUR) Game genie (added 28.11.21):

8D9‑4BA‑C48+00C‑858‑C4D (for the US version only)

Re-enables the Message test. Press Select or Start during the game in the game menu, then use Up/Down to increase/decrease message index by 1, use Left/Right to increase/decrease message index by 10, press A to display selected message, press Select to change message library. Press Start to exit back to the ingame menu. Note, due to original code specific, message index indicator does not updated when displayed messages from library with index 3. It seems, they added it for translation purposes at the development stage.

T2: The Arcade Game

(UNI) Title screen cheats (added 01.06.22):
At the title screen, input one of the following combinations to get a corresponding effect. A sound will confirm correct code entry. You may input more than one codes, but you need to wait to return to the title screen when screen changes to the current Hi-Scores display.

Up, Down, Up, Down, Up, Down, A, A, A	-	Start from Stage 2
Up, Down, Up, Down, Up, Down, A, A, B	-	Start from Stage 3
Up, Down, Up, Down, Up, Down, A, B, A	-	Start from Stage 4
Up, Down, Up, Down, Up, Down, A, B, B	-	Start from Stage 5
Up, Down, Up, Down, Up, Down, B, A, A	-	Start from Stage 6
B, A, A, B, A, A	-	Unlimited rocket launcher ammo. Note, if you take ammo bonus the ammo won't be unlimited anymore.
B, Up, Down, Down, B, Up, Down, Down	-	Unlimited lives.

(BUR) Game genie (added 02.06.22):

F22‑03F‑F7D

Re-enables developement stage leftover memory viewer instead of Game Over / Continue screen. Start a new game, loose all lives then you'll see it.

Taikyoku Renju

(FIX) Title screen cheats (added 03.06.22):
At the title screen, hold one of the following combinations and wait for the demo sequence start. You don't have to hold the buttons all the time, but hold them just before transition to the demo sequence. This takes usually about 8 seconds from the appearance of the title screen itself.

Left + B	-	Sound test
Right + B	-	Credits

Source: gamefaqs.com, tcrf.net

(BUR) Hidden text (added 03.06.22):
There is a hidden copyright string at the beginning of the ROM:

1989  SALIO & ANex

Source: tcrf.net

Tail 'Gator (USA), Shippo de Bun (Japan)

(GEN) HP refill (added 09.12.21):
During the game, press Start to pause it, input Up, Down, Left, Right, B, B, A, A. You'll hear a sound and obtain instant 7 HP. This may be done unlimited amount of times.
Source: urawaza.in, gamefaqs.com

Taiyou no Tenshi Marlowe: Ohanabatake wa Dai-Panic

(FIX) Secret passwords (added 06.06.22):
Note, all passwords are the names of some famous people - directors or actress etc. (except "SOUND").

ASTAIRE	-	Dummy password, does nothing.
BERGMAN	-	Dummy password, does nothing.
SOUND	-	Sound test.
MCQUEEN	-	Makes the sun go faster, the heart usage is lower and the initial seeds grow at the same time.
BOGART	-	Same effects as "MCQUEEN", but on "HARD" difficulty with different levels.
DEAN	-	See the "EASY"/"NORMAL" ending and credits.
MONROE	-	See the "HARD" ending and credits.

Source: gamefaqs.com, tcrf.net

(BUR) Game genie (added 06.06.22):

7568:01-00

Re-enables one unused password: "AUDREY". This one activates the "HARD" mode with different kind of levels, same a with "BOGART" password but without additional options.

Source: tcrf.net

Taiyou no Yuusha: Firebird GB

(UNI) Stage select and Sound test (added 06.06.22):
At the IREM logo, quickly press A 10 times. Press Start at the title screen to start a new game. At the Level select screen, hold A + B and press Start. Use Up or Down to change menu position, Use A or B to change numbers, press Start to either play the BGM/SE or start a new game from desired level.

TaleSpin

(GEN) Stage select (added 28.02.17):
At the title screen, hold Down + Left + A, then press Start.
Source: gamefaqs.com

(UNI) Invincibility (added 28.02.17):
Enter the Stage select mode as described above. Choose any stage, then hold A + B and press Start. You'll be fully invulnerable to enemies and its projectiles, but still can stuck in the obstacles. Additionally, if choose a Bonus stage you'll see the secret message "THANKS YOU FOR PLAYING" after this stage is over. Note, this is not an actual Bonus stage, there is no scroll and you couldn't collect any items, you just can wait for the timer is over or skip it with Left + Right + Down buttons at the same time.

Tamagotchi (USA, France), Game de Hakken!! Tamagotchi (Japan)

(GEN) Cart RAM clear (added 08.05.18):
At the title screen, enter "OPTION", then "Memory". Hold Up + Select and press A. Release all buttons, game will reset with all data clear.

(GEN) Sound test (added 10.05.18):
Win any tournament, then go to the "OPTION" menu and choose new option "Music" to access Sound test.
Source: gamefaqs.com

(GEN) Extra status indicators (added 08.05.18):
During the game, enter "STATUS" screen, hold Down + Select, then press A to toggle on and off the additional status indicators at the bottom-left corner of the screen. This will display "Fear" and "Mine" parameters.
Source: urawaza.in

Tasmania Story

(GEN) Invincibility (added 07.06.22):
At the title screen, hold A + B then wait for the intro. Press Start, then at the "LEVEL SLECT" screen hold Up then again press Start. Finally, at the "KEY FUNCTION" screen hold Down and press Start.
Source: makainyumon.web.fc2.com

Taz-Mania 2 (USA), Taz-Mania (Europe)

(UNI) Title screen cheats (added 10.06.22):
At the title screen, input one of the following codes to get a corresponding effect. You may input more than one cheats every time the title screen appears after the intro sequence.

B, A, Down, Select, Up, Down	-	Extra 20 lives
Down, A, Down, Select, Left, Right, Select	-	Level select
Up, A, Select, Down, Right, B	-	Infinite spin power
Up, B, A, Down, B, Left or Left, A, Down, Right, A, Select	-	Dummy cheats, does nothing, but always force the game to return to the title screen, you can't play the game at all if enter hese cheats. It seems they have planned something for these but didn't inplemented it after all.

Tecmo Bowl

(BUR) Hidden text (added 16.06.22):
There are a long copyright string in both regional versions of the game near the beginning of the ROM. In the US version:

TECMO BOWL VER 1.0 6-19-91 (C) COPYRIGHT 1991 (P) TECMO LTD. 18005 S. ADRIA MARU LANE CARSON CALIF. 90746 U.S.A. (213) 329-5880

In the Japanese version:

TECMO BOWL VER 1.0 6-25-91 (C) COPYRIGHT 1991 (P) TECMO LTD. 18005 S. ADRIA MARU LANE CARSON CALIF. 90746 U.S.A. (213) 329-5880

Source: tcrf.net

Teenage Mutant Ninja Turtles: Fall of the Foot Clan (USA), Teenage Mutant Hero Turtles: Fall of the Foot Clan (Europe), Teenage Mutant Ninja Turtles (Japan)

(GEN) Refill energy (added 19.06.16):
During the game, press Start to pause it, then enter Up, Up, Down, Down, Left, Right, Left, Right, B, A. This can be done only once per game, however.
Source: gamefaqs.com

(GEN) Hidden minigames (added 19.06.16):
At the Configuration screen, press A + B + Select. A question mark will appear next to the 5th stage option. Select it to be able to play one of the three hidden minigames.
Source: gamefaqs.com

Teenage Mutant Ninja Turtles III: Radical Rescue (USA), Teenage Mutant Hero Turtles III: Radical Rescue (Europe), Teenage Mutant Ninja Turtles 3: Turtles Kikiippatsu (Japan)

(BUR) Game genie (added 21.06.16):

E8B‑40F‑809+37B‑41F‑E6A+357‑E9C‑2A6 (for the US version)
7BB‑43F‑809+37B‑44F‑E6A+357‑7CC‑2A6 (for the Japanese version)

Re-enables simple Debug mode. To activate it, press Down + Select any time. Additional Game genie code needed to fix somehow the auto-lock of this handler to itself.
However, the code still may be locked up if you press the same combination being in the Debug mode. To exit it use only the Select button!
While in the Debug mode, during the game:
Right - toggles the Invincibility on/off.
Down - gives an extra Pizza.
A - sets some vars, need to investigate.
Start - toggles the Free mvement mode on/off
...or at the Password screen:
Up - starts some kind of a counter on the password string, presumably used at the developement stage.

Tekkyu Fight!: The Great Battle Gaiden

(GEN) Title screen cheats (added 15.06.22):
At the title screen, when "PUSH START" is displayed, press any of the following button codes or sequences to get a corresponding effect, then press Start. Some cheats may be combined except of those what need to held particular combinations.

Up + Right + B	-	Infinite magic power.
A 5 times	-	Extra 9 lives.
B 10 times	-	Infinite continues.
Select 20 times	-	Invincibility.
Down + Select	-	Any weapon is available to any character during the game.
Left + Select + B	-	Final boss.

Source: urawaza.in

Tenchi o Kurau

(GEN) Sound test (added 30.08.20):
At the title screen, press hold Select, press A.
Source: urawaza.in, Garrett Greenwalt

(UNI) Cheat mode (added 31.08.20):
Start a new game. At the intro, when game is waiting the player input to continue, hold Left + Select + B, then press A. This gives you at the beginning of the game 10000 gold/barracks and very powerful equipement, although the character parameters and level are default ones.

(BUR) Game genie (added 31.08.20):

212‑F6F‑D56	-	Input this code before exit the title screen. This is an unreferenced leftover of the game map selection screen probably intended to be called somewhere from game itself.
070‑68F‑E6A	-	Set "SAMPLE" mode flags. Disables all random encounters, disables music change between locations, add "SAMPLE" to the title screen.

Tetris

(GEN) Faster speed (added 20.06.22):
At the title screen, hold Down then press Start. Choose any level, now speed will be by 10 faster than selected, ie Level 0 will ply as Level 9 and so on.
Source: gamefaqs.com

Tetris 2 (USA, Europe), Tetris Flash (Japan)

(GEN) Show SGB borders (added 21.06.22):
In SGB enhanced version During the game, pause it and press A. For every press the new SGB border will be displayed total of 5. By default game starts with just default border.
Source: gamefaqs.com

(BUR) Game genie (added 21.06.22):

400‑00F‑E6A

Raise the debug flag in the ROM of any version. Any time during the game, use Soft-reset code (A + B + Select + Start) to access the complex debug menu. Not only the SE/BGM test are available, but selection any section of the game including not accessible during the game replay recorder/player and stage constructor. Press B to activate CPU meter. Also in SGB enhansed version Select will change SE option to "SGB A"/"SGB B" for SGB SE test correspondingly.

Source: tcrf.net

Tetris Attack (USA), Yoshi no Panepon (Japan)

(GEN) Unlock extra characters in VS mode (added 23.06.22):
Start "VS" game with two GameBoys linked with cable. At "SET LEVEL" screen, hold Up then press A. In addition to 8 playable stages there will be 4 more in the lower row. This is unlockable cheat, given to you when you beat "StageClear" mode.

(GEN) Sper Hard mode (added 23.06.22):
In "VS.COM" mode, set cursor to "HIGH" difficulty, hold Up + Select, t hen press A or Start. This code is unlockable and given to you when you beat "VS.COM" on "HARD" mode.
Source: gamefaqs.com

(GEN) Hidden SGB borders (added 23.06.22):
There are 6 extra hidden SGB borders available when playing the game in SGB enhanced mode. At the title screen, input one of the combinations from the table below to activate one of hidden borders. To restore default border, return to the title screen with B and press Start.

Hold Down, press A	-	Yoshi border
Hold Down, press Start	-	Froggy border
Hold Up, press A	-	Poochy border
Hold Up, press Start	-	Raphael the Raven border
Hold Left, press A	-	Gargantua Blargg border
Hold Left, press Start	-	Lakitu border

Source: gamefaqs.com

Tetris Blast (USA), Super Bombliss (Japan)

(GEN) Extra pices (added 27.04.22):
Complete all 50 level of the "CONTEST" mode then start a new game with the password given to you after beating Level 50. From now, in addition to regular "TETRAMINO" game pices, two "PENTAMIMNO" tiles ("CROSS", "T") will be added to the game.
Source: gamefaqs.com

(FIX) FIGHT 2 mode (added 21.04.22):
At the title screen, input one of combinations from the table below and press Start to access the game mode selection menu where "FIGHT" mode will turn into "FIGHT 2" mode. This cheat is unlockable. It will be activated instantly after beating the regular "FIGHT" mode, as well as the game will tell you how to activate it any time later.

Version	\|	Button code
The Japanese version	\|	Press B 4 times, then one more time and hold it.
The US version	\|	Press B 5 times.

(UNI) Passwords generator (added 21.04.22):

(BUR) Game genie (added 26.04.22):

086‑A5A‑E66 (for the Japanese version)
086‑CFA‑E66 (for the US version)

Shows the unused "DEBUG" menu text instead of "Stage select" message before the game. The menu text is the only what is left out of possibly exsisting at some developement stage Debug routine but not in the released versions. Text exactly the same in all regional versions.

Tetris Plus

(GEN) Stage select (added 23.06.22):
Beat the "PUZZLE" mode game first, clear all 100 levels. Then after the Staff roll you'll be informed that you can now select any level. Go to "PUZZLE" mode again, choose "CONTINUE" and during the game press Start to pause it. In addition to regular pase menu there will be a message "PUSH B", push B to enter the Stage Select mode. Use Left or Right to select another level and Start to play it.
Source: urawaza.in, gamefaqs.com

(UNI) Stage skip (added 23.06.22):
At the title screen, input Up, Right, Down, Left, Up, Down, B, A, Right, Left. A sound will confirm correct code entry. During the game in "PUZZLE" mode press Up + Select at the same time to skip to the next level instantly. This also will work when you play in "EDIT" mode.

(UNI) Instant Stage select (added 23.06.22):
At the title screen, while holding Select, input A, A, B, B, Left, Left, Right, Right, Up, Down. A sound will confirm correct code entry. This will mark all levels as completed, so you'll be able to use Stage select mentioned above with no need to beat the game first.

Tintin in Tibet

(UNI) Stage select (added 24.06.22):
At the license screen, input Up, Right, B, Down, Left, B. A sound will confirm correct code entry. Now start a new game, pause it, then press A + B to activate rather garbled stage select. Use D-Pad to select level, then press Start to play it.

(UNI) Invincibility (added 24.06.22):
At the license screen, input the "Stage select" button sequence first, then press any button and input Up, Right, A, Down, Left, A. A sound will confirm correct code entry one more time. Now during the game you'll be invincible.

(UNI) Secret credits (added 24.06.22):
At license screen, input Left, Left, Left, Right, Left. After a while a set of developer's names with face pictures will appear.

Tiny Toon Adventures

Japanese version:

(GEN) Secret passwords (added 28.06.22):

Carrot, Carrot, Carrot, Carrot	-	Run minigme
Watermelon, Watermelon, Watermelon, Watermelon	-	Mole minigame
Empty, Empty, Empty, Empty	-	Sound Test
Carrot, Empty, Empty, Empty	-	Hard Mode

Source: gamefaqs.com

(BUR) Game genie (added 28.06.22):

AAC‑958‑B3F

Re-enables disabled for some reason third secret password for a minigame. Input "Pineapple, Pineapple, Pineapple, Pineapple" as a password to play Slot minigame.

Source: tcrf.net

Tiny Toon Adventures: Montana's Movie Madness (USA), Tiny Toon Adventures 2 (Japan)

US version:

(GEN) Hard mode (added 28.06.22):
At the title screen, hold A and press Start. This code is unlockable and given to you when you beat the game on the normal difficulty.
Source: gamefaqs.com

(FIX) Minigames menu (added 28.06.22):
At the title screen, hold B and pres Start.
Source: gamefaqs.com

Japanese version:

(FIX) Secret passwords (added 28.06.22):
Note, Hard mode passwords are given to you after you beat the game on the normal difficulty.

Ball, Empty, Carrot, Bird	-	Stage 1, Normal
Bird, Ball, Carrot, Ball	-	Stage 2, Normal
Carrot, Buster, Empty, Ball	-	Stage 3, Normal
Buster, Ball, Bird, Empty	-	Stage 4, Normal
Bird, Empty, Buster, Bird	-	Stage 5, Normal
Buster, Ball, Ball, Buster	-	Stage 1, Hard
Empty, Buster, Carrot, Buster	-	Stage 2, Hard
Bird, Carrot, Empty, Ball	-	Stage 3, Hard
Ball, Empty, Empty, Carrot	-	Stage 4, Hard
Carrot, Bird, Ball, Buster	-	Stage 5, Hard
Buster, Buster, Buster, Buster	-	Minigames menu

Source: urawaza.in

Tiny Toon Adventures: Wacky Sports (USA), Tiny Toon Adventures: Dokidoki Sport Festival (Japan)

(GEN) Events select (added 29.06.22):
At the title screen, input "Konami code": Up, Up, Down, Down, Left, Right, Left, Right, B, A then press Start. Start a new game in "SPORTS FESTIVAL" mode. After the introduction you'll be able to select the sports event from the menu instead of doing it one by one.
Source: urawaza.in, gamefaqs.com

Tokio Senki: Eiyuu Retsuden

(GEN) See all heroes info (added 30.06.22):
During the game, press B to enter ingame menu, then Start to enter system menu. Put cursor to "システム２" ("SYSTEM2") option, press Left, Right, Right, Right, Right, Right, Right, A. If done right, the "SYSTEM2" menu will have an additional third option "英雄" ("Heroes"). Select it to see all the game Heroes list with names and parameters.
Source: urawaza.in

(GEN) Title screen cheats (added 30.06.22):
Input one of the following button sequences at the title screen when animation stops to have a corresponding effect.

B, Down, Down, Down, Down, Down, Down, A	-	Sound test
B, Select, Select, Up, Select, Up, Up, A	-	Credits

Source: urawaza.in

Tokyo Disneyland: Fantasy Tour

(BUR) Game genie (added 11.06.22):

201‑C8F‑C47	-	Re-enables complex Debug mode. Source: tcrf.net, nensondubois
491‑C8F‑C47	-	Start the game from disabled screen "NOW MAKING" presumably intended for Prototype versions.
008‑44B‑C4D	-	Re-enables the lips-sync animation for the characters presentations screen. To see this, start a new "GUIDE GAME", choose a character and watch its message.

Tom & Jerry

(GEN) Title screen cheats (added 01.07.22):
All cheats must be input at the title screen. Note, when you input the cheat sequence the last Start button does not exit the title screen. After entering such sequence you must to press Start one more time to continue.

A, Down, Up, Right, Up, A, Start	-	Infinite Lives.
Left, Left, B, Left, Right, A, Start	-	Infinite Time.
Right, B, Up, Up, Left, A, Start	-	Stage Select. Enter the password option at the title menu.
B, A, Up, Left, Right, Down, Start	-	Infinite Health.
Left, Left, Right, Right	-	Sound Test.
Up, Down, Left, A, A, B, Start	-	View The Ending.
B, Left, A, A, Up, Left, Start	-	Infinite Projectiles.

Source: gamefaqs.com

Tom and Jerry: Frantic Antics! (USA), Tom to Jerry Part 2 (Japan)

(GEN) Title screen cheatss (added 04.07.22):

Select, Select, Up, Down, Left, Down-Infinite Lives.

Up, Up, Down, Left, Right, Left-Infinite Time.

Up, Left, Down, Left, Down, Left-Stage Select.

Left, B, Up, Left, B, Up-Infinite Health.

Source: gamefaqs.com

Torpedo Range

Japanese version:

(GEN) Hidden mini-game (added 04.07.22):
At the title screen, input Down, Up, Left, Right, Up, Down, Select, Start. The goal of this mini-game is to provide the ball into the glass using supporting boxes and shoulders of the player's character. This game was disabled in the US version for some reason.
Source: urawaza.in

US version:

(BUR) Game genie (added 04.07.22):

CD5‑B4E‑D5E+365‑B5E‑6EA+215‑B6E‑3B5

Re-enables the Hidden mini-game (see above). Althought it was disabled in the US version, all coding and data is still in the ROM. With these codes, at the title screen input Down then 7 more random buttons.

Tower of Druaga, The (Single game cart, Namco Gallery Vol.2)

All versions:

(UNI) Another Druaga Floor 22 treasure chest (added 27.06.19):
At Floor 22 in "Another Druaga" mode, in order to obtain a treasure chest press Right, Right, Right, Right, Right, Right, Right, Left, Right, Right, Right, Right, Right, Right, Right. Same code were used in the NES version for regular mode Floor 22. Unless the NES version, there are no more button codes for accessing the treasure chests in GB version.

Namco Gallery version:

(GEN) Another Druaga (added 27.06.19):
At the title screen, press Right, Right, Right, Right, Right, Right, Right, Right, Right, Up, Up, Left, Left. The title name color will turn dark.
Source: gamefaqs.com

Signle game cart version:

(GEN) Another Druaga (added 27.06.19):
At the title screen, press B, B, B, B, B, B, Left, Left, Left, Left, Right, Right, Right. The title name color will turn white. Same code were used in the NES version.
Source: gamefaqs.com

(BUR) Hidden text (added 27.06.19):
The Cart RAM initialization routine uses following string as a signature:

Yoshikawa

Toxic Crusaders

(GEN) Secret passwords (added 07.07.22):

47214

Enables the Cheat/Debug mode. After entering this password enter another one one more time to continue the game or input "00000" to return to the title screen and start the game from the beginning. During the game:
- Hold Up, press Start to toggle debug coordinates display.
- Hold Select, press A or B to skip to the next or previous stage accordingly.
- Hold Select, press Start to toggle invincibility.

Source: tcrf.net

Toy Story

(UNI) Stage skip (added 07.07.22):
At the title screen, input Up, Up, Down, Down, Down, Left, Right, Left, Right, B, A, Start. During the game press Select to skip current stage instantly.

Track Meet (USA, Japan), Litti's Summer Sports (Germany)

(FIX) Secret names (added 24.08.18):
Input one of following words as a player name to get a corresponding effect.

"APPLEII"	-	Activates "APPLE II" banner on the background border. Note, there are no banners at all in the German version so this name does nothing there. Source: gamefaqs.com
"HEINEMAN"	-	This is a name of developer. Working exactly the same as previous.
"SNAKE"	-	Start to play with "IRWIN.B CHEETIN", a 4th opponent. Also activates "SNAKE WUZ HERE" banner in place of previously mentioned "APPLE II" banner. Note, the same as with previous names in the German version, there are no banners at all. Source: gamefaqs.com
"WORMY"	-	Start to play with "SWAMMI PASTRAMI", a 2nd opponent. The only actually cheating secret name here. It adds an extra instant 150 points to the player at any result screen.
"REGRUB"	-	"BURGER" backwards. Start to play with "JACK STROB", a 5th opponent. Source: gamefaqs.com

(BUR) Hidden text (added 23.08.18):
There is a hidden developer's message near the beginning of the ROM which explains the "ALLPE II" banner:

Created on an Apple IIgs personal Computer.
Apple II Infinitum!

Trax (USA), Totsugeki! Ponkotsu Tank (Japan)

(GEN) Quick multi game exit (added 05.07.22):
During multi game, pres Select + Start + Down at the same time to exit back to player/stage selection screen instantly.

Trip World

(GEN) Stage select and Sound test (added 09.07.22):
At the title screen, when ccreature passes the screen, press Select.
Source: gamefaqs.com

True Lies

(GEN) Secret passwords (added 11.07.22):

MLLSSS	-	Mall (unable to get it in-game for some reason)
RSSHLS	-	Park (one of two passwords given in-game)
DQCKKS	-	Docks (unable to get it in-game as well)
QFFCSS	-	Final (second password given in-game)
MTDRJB	-	Infinite lives

Source: gamefaqs.com

(BUR) Game genie (added 11.07.22):

011‑E2F‑F7E

There is an Error handler in the game ROM. You can see how it looks like with this code.

Source: tcrf.net

Trump Boy

(GEN) Sound test and cheat mode (added 11.07.22):
At the title screen, input Up, Down, Left, Right, Up, Down, Left, Right then press Start. After exit from Sound test with Start in regular game all opponent's cards will be shown.
Source: urawasa.in, gamefaqs.com

Trump Boy II

(GEN) Sound test and cheat mode (added 11.07.22):
At the title screen, input Up, Down, Left, Right, Up, Down, Left, Right then press Start. After exit from Sound test with Start in regular game all opponent's cards will be shown.
Source: urawasa.in, gamefaqs.com

Tsumeshougi: Mondai Teikyou Shougi Sekai

(BUR) Hidden text (added 12.07.22):
Here is a hidden credits in the game's ROM at 0x00386D:

NISHIZAWA TAKASHISAKUMA AKIRAKITAZAWA TSUYOSHI

Tumble Pop

(UNI) Secret passwords (added 14.07.22):
Note, althought there is a secret pregenerated passwords inside the game, the regular password system itself very simple and easy to manually generate just by guess. The only thing password system check is checksum (last symbol) and if parameters does no exceeded the maximum values (less than 10 for all items, less than 100 gold and less than 32 lives.
Also note, even secret predefined passwords need to have a checksum symbol which is oddly enough not stored inside the ROM. All they are already calculated and added to the all passwords in list below.

Pasword	\|	Speed	\|	Lives	\|	Boots	\|	Power	\|	Super	\|	Clock	\|	Complete	\|	Gold
=5416111L	\|	1	\|	4	\|	1	\|	1	\|	1	\|	1	\|	0	\|	10
=3700700J	\|	1	\|	4	\|	1	\|	1	\|	1	\|	1	\|	0	\|	10
=3353741T	\|	2	\|	4	\|	1	\|	1	\|	1	\|	1	\|	0	\|	10
=2208000C	\|	1	\|	4	\|	4	\|	4	\|	4	\|	4	\|	0	\|	10
=3922009S	\|	2	\|	8	\|	1	\|	1	\|	1	\|	1	\|	0	\|	10
=3700724Q	\|	1	\|	4	\|	1	\|	1	\|	1	\|	1	\|	1	\|	10
=2867080,	\|	1	\|	4	\|	1	\|	1	\|	1	\|	1	\|	2	\|	10
=2862071T	\|	1	\|	4	\|	1	\|	1	\|	1	\|	1	\|	4	\|	10

Turok: Battle of the Bionosaurs

(UNI) Sound test:
At the title screen, put cursor to "OPTION" menu item, then press Up once and hold it, cursor must be on "START" option. Now just press Start to enter the Sound Test mode.

(FIX) Secret passwords:

ZYDRTRKWPS	-	Infinite ammo.
ZYDRTRKLVS	-	Infinite lives.
ZYDRTRKNRG	-	Infinite energy.
ZYDRTRKBRD	-	Bird mode. During the game hold Select, then press A. Move your character to any position. Hold Select and press A again to put it back.
ZYDRTRKLVL	-	Stage select. On pause, press A + B.
CGRZYDLYNY	-	Secret message. Although it says "BAD PASSWORD", hold Up + Right + B before exit back to the title screen and press Start to see a dedications screen, same as in other Bit Manager's games.

Source: gamefaqs.com

(BUR) Game genie:

009‑1CA‑80A+009‑1DA‑D55 (for the US version)	-	Replaces the pause during the game with Frame advance mode. Press Start, then Select to advance to the next frame.
489‑16A‑D5F	-	Re-enables the debug memory view. With this code and the Stage select password, press A + B on pause to enter it.

Turrican

(GEN) Invincibility and Stage skip (added 18.07.22):
At the Title menu, input A, B, B, A, B, A, A, B, A, A, B, A, A. The "START" menu option will change to "CHEAT". Pause the game and press Select to skip current stage.
Source: gamefaqs.com

(BUR) Hidden text (added 19.07.22):
There is a hidden message at the beginning of the game's ROM:

THE.CODE.MONKEYS
.EAT JALAPENOES.
.FOR..BREAKFAST.

Source: tcrf.net

TV Champion

(UNI) Secret passwords (added 21.07.22):
At the "CONTINUE" option, input password "ゆうこ" ("YUUKO", the rest of the symbols must be all "あ") and press "おあい" ("END") option. The music track from the STAFF roll will be played then. It seems the devs are planned more secret passwords but only one were implemented.

(BUR) Game genie (added 21.07.22):

0E1-A1F-E6E

Start the game from rather disabled buf fully functional Sound Test.

Source: tcrf.net, nensondubious

Uchuu no Kishi Tekkaman Blade

(BUR) Game genie (added 23.07.22):

11A‑1BF‑3BF+0CA‑1CF‑C46

Re-enables the simple stage select screen. Choose desired levell with a D-Pad buttons, then press any other button to play it.

Uchuu Senkan Yamato

(GEN) Secret passwords (added 26.07.22):

YAMATO

See the ending with STAFF credits.

Source: urawaza.in

Ultima: Runes of Virtue

(UNI) Developers Room (added 02.08.22):
In order to find this room, you has to get the "MAGIC WAND" weapon. From the Lord's British Castle go north-east and destroy the Black Web with the wand then take a boat. The Emphaty Abbey is at the north-western corner of this island. Upon entering the castle, do not enter the door in front of yoy. Turn left and carefully walk along the wall, then turn up. Here you'll see a sign "The Wishing Well". Go to the well to reveal the hidden ladder. Take it to get to the Developer's room. All The Sign and all characters here are reading a messages of the developers they representing.

Ultima: Runes of Virtue II

(UNI) Power player (added 02.08.22):
Start a new game, at the Character selection screen, put corsor to Dupre, hold A + B and press Start. Instead of Dupre you'll play Iolo but with all useful items, 99 gold, MAX health and speed. However, for some reason, ST, IQ and DX are displayed as zero.

(BUR) Game genie (added 02.08.22):

28C‑6D9‑6EA

Use this code then just try to exit to Owerworld Map during the game in order to see a fully functional Error Handler with a current CPU and game states as well as simple memory viwer/editor.

Ultraman

(GEN) Options menu (added 03.08.22):
At the title screen, press Select + Start at the same time.
Source: gamefaqs.com

Ultraman Ball

(GEN) Stage select (added 15.08.22):
At the title screen, press and hold A + B + Select for a couple seconds until the Stage Select screen appear.
Source: makainyumon.web.fc2.com

Ultraman Chou Toushi Gekiden

(GEN) Secret psswords (added 17.08.22):

ばるたんせいじん	-	Stage 2
しあいかいしだ	-	Stage 3
せんしへのおくりもの	-	Stage 4
ぺんしるばくだん	-	Stage 5
なぞのころしや	-	Stage 6
きんぐせいのかみ	-	Stage 7
しんゆうせぶん	-	Stage 8
かならずかつ	-	Stage 9
ひかりのいちげき	-	Stage 10
かとくたいのみんな	-	Stage 11
がんばれうるとらまん	-	Stage 12
しれんのほし	-	Stage 13
だいまおう	-	Stage 14
このいのちにかえても	-	Stage 15
まもれわれらのふるさと	-	Stage 16
でんせつのせんし	-	Stage 17
ぶどうのたつじん	-	Stage 18
めたるぶれすと	-	Stage 19
さいごのいちげき	-	Stage 20
あおきいし	-	Stage 21
うるとらのほしへいそげ	-	Stage 22
せんしのきかん	-	Stage 23
らすとばとる	-	Final Stage

Umi no Nushi Tsuri 2

(BUR) Game genie (added 24.08.22):

203‑88E‑80A	-	Re-enable the Debug menu activation code. Any time during the game hold A + B and press Select to open a complex debug menu. Debug menus are exactly the same as in other games developed by TOSE, like "Kawa no Nushi Tsuri 3" and others.
28D‑C8A‑80A	-	Re-enable Battle debug leftover. During the battle, press Select to instantly skip it.

Source: tcrf.net

Undercover Cops Gaiden: Hakaishin Garumaa

(GEN) Sound test (added 26.08.22):
This is not an actual hidden feature, but to access it you must beat first three Stages, then walk about half of the Stage 4 until you reach "INN" in the woods. See, there is another house with "アイレム" ("IREM") on the plate. You must reach it. The invisible road after "INN" goes left, then up, then right again around the edge of woods. When you reach rightmost side of the screen, go down to the "IREM" house. Inside you'll find "STAFF ROOM" and will be able to listen to the game music.

Universal Soldier

(UNI) Secret passwords (added 06.09.22):

ZNLML	-	Unlimited wave attack.
YGRNX	-	Unlimited health.
NDNWL	-	Unlimited lives.
ZKCLB	-	Show all hidden bonus blocks.

Urban Strike

(UNI) Secret passwords (added 07.09.22):

B0RT

Credits. Note, the regular password system able to access both "GAME OVER" and "CREDITS" screens, however, in the regular game you can see the final credits if you beat the game and get the "GAME OVER" password first. This particular password is an actual special hardcoded secret password to access the "CREDITS" only and instantly.

Vattle Giuce

(GEN) Secret Mini-game (added 09.09.22):
At the title screen, hold Left + Up + A + B then press the title screen. The mini-game is about just avoiding the projectiles, not the firing on them.
Source: makainyumon.web.fc2.com

Vegas Stakes

(UNI) Easter egg (added 15.09.22):
This game have very odd Easter egg. There are some random events interrupting your game sometimes, no matter what casino or game you playing. One of the events is "BOXING ON TV". When it happens you've asked if you want to make a bet on boxing match, then the TV is diplaying always the same animation of boxers no matter who actually will win. During the match, hold A + B + Up + Left then wait. In the end, left boxer additionally will perform a couple extra fast punches to the opponent. That is all the difference. This is does not affect the match result also.

Volley Fire

(BUR) Hidden text (added 18.09.22):
There is a hidden copyright and version text at the end or the ROM:

WINCHESTER Ver. 1.00-79GL
Mar 01,1990

Source: tcrf.net

V-Rally: Championship Edition

(UNI) Secret passwords (added 19.09.22):
Input word "EZUC" at the "OPTIONS" screen as a password. The code seems does nothing, just resets the input field. But, if you exit the "OPTIONS" and start the game in either "ARCADE" or "CHAMPOIONSHIP" modes you can skip current race with Select button any time.

(BUR) Hidden text (added 18.09.22):
Therea are a hidden copyright texs for the game and the Sound driver at 0x0088A2 and 0x008B60 correspondingly in the ROM:

1998 by Alberto Jose Gonzalez.

and

(Music & Sound Driver by Alberto Jose Gonzalez, 1998)

Wario Blast Featuring Bomberman! (USA), Bomberman GB (Japan)

(FIX) Secret passwords (added 25.07.16):

4622 (for all versions)	-	Start game powered up with Bomberman
5656 (for all versions)	-	The Battle mode with Bomberman
2264 (for the US version only)	-	Start game powered up with Wario
6565 (for the US version only)	-	The Battle mode with Wario

Source: gamefaqs.com

Wario Land II

(BUR) Game genie (added 01.10.22):

238‑5F9‑D5A	-	Usually, when you beat one chapter of the game, the map is shown where you may watch where you missed something and replay the game for 100%. With this Game genie you may re-enable an unused and seems unfinished routine to show "MAP MODE X" screen before going to the map itself. Use "CONTINUE" mode when you saved the game in the middle of the Stage to see this screen and go instantly to the map mode with no need to beat the game first.
00C‑3BA‑C4D	-	Re-enables the free-look mode. Pause the game, then hold A and press D-Pud buttons to view surroundings of the current location. While still holding A press A sound will confirm correct code entry% to center the camera to the Wario character again.

Water World

(GEN) Stage skip (added 01.10.22):
During the game, press Start to pause it. Input Up, Up, Up, Right, Down, Left, A, Up, Up, Up, Right, Down, Right, Up, Right, Down, Down, Down. A sound will be heard. Unpause the game, now press Select + Start to skip to the next stage instantly up to the ending and staff roll.
Source: gamefaqs.com

Wave Race

(GEN) CRAM clear (added 09.10.22):
At the title screen, press Up + Select + Start at the same time, "SAVE CLEAR" screen will ask you if you want to erase saved data.
Source: tcrf.net

Wayne's World

(UNI) Pause mode cheats (added 30.10.22):
Pause the game, then input one of the following codes. If done right, the "E" symbol will appear at the game's HUD near the HP-meter. Some cheat sequences were already known (marked), but there are 5 more previsouly unknown cheats here. Note, when you need to hold Start in the cheat sequence, you just need to keep holding Start after pausing the game. Also note, all cheat sequences are representing a particular words (given in brackets).

B, A, Right, B, A, Right, A	-	(BARBARA) Hidden cutscene Source: gamefaqs.com
Down, Up, A, Left, Down, Up, A, Left	-	(DUALDUAL) Toggle Characters any time Source: gamefaqs.com
Up, Select, Up, A, Left, B, A, Select, Down, A, Right, Down, Select	-	(USUALBASDARDS) This cheat does only one thing, rises a flag that usually used when you pick up a "DONUT" object once (when you pick up anther "DONUT" this flag is erased). This flag usually only used to count donuts in a "DONUT SHOP" stages. But in a particular places it is serves to the different purposes. See the Easters sections below.
hold B, hold A, then Left, Left, Select	-	(BALLS) Level Skip Source: gamefaqs.com
Select, A, Down, Up, Select, Select, Right	-	(SADUSSR) Free movement mode Source: gamefaqs.com
B, A, Down, Select, A, Left, A, Down	-	(BADSALAD) Infinite lives. This code cause the "HP" and "TIMER" refill when you run out of one of them, so your "HP" and "TIME" now literally infinite. Also, if you fall into the pit, you'll jump out of there. Source: tcrf.net
Down, Right, B, A, Left, Left, A, Right, Down	-	(DRBALLARD) Input it at the "STAGE 2" "CD BOSS" to instantly kill it.
hold A, hold B, then Select, Up, Right, Down	-	(ABSURD) Instant 4 lives, 200 seconds of time, MAX HP is 20.
hold B, hold A, then Left, Left, Left, Select	-	(BALLLS) Level select (R 1, L 2, U 3, D 4, A 5, B 6, S 7) Source: gamefaqs.com
B, A, Right, Down, Select, B, A, Right, Down, Select	-	(BARDSBARDS) Disable background music.
hold Start, then A, B, A, Down, Left, A, Down	-	(ABADLAD) Programmer's picture. Source: gamefaqs.com
hold Start, then Right, A, Down, A, Right, B, Right, A	-	(RADARBRA) Programmer's friend pictre. Source: gamefaqs.com
hold Start, then Select, A, Left, A, Down, Left, A, Select, Select	-	(SALADLASS) Programmer's girlfriend picture. Source: gamefaqs.com
B, Left, A, B, Left, A, B, Left, A	-	(BLABLABLA) Black screen with sampled sound "NO WAY" played repeatedly.
B, Right, A, Select, Select, B, A, Right	-	(BRASSBAR) Hidden level. Source: gamefaqs.com
A, Left, Left, Right, Up, B, B, A, Right, Select	-	(ALLRUBBARS) Toggles partial disabling of level objects handling and enemy AI. Very glitchy, most of the time you cannot complete the Stage with it, but sometimes it may help to avoid some enemies or obstacles. The gun projectiles also does not fire.

(UNI) Donut's Shop Easter egg (added 30.10.22):
At the "DONUTS SHOP" stage, collect all donuts except three which are located at the three round tables in this room. You'll fall down the floor and be able to collect even more donuts and other bonuses. Walk to the far right to complete the sage or just collect all extra donuts as usual.

(UNI) Developer message easter egg 1 (added 30.10.22):
Go to the middle of the "STAGE 2", climb to upper level just above the "EXCALIBUR GUITAR". You will see an "AMPLIFIER" with "E" powerup on it. Do not take it, just walk away and jump to the "AMPLIFIER" from the right side. Now, input "USUABALSDARDS" cheat described above, which is seems does nothing, but not this time. When "E" symbol appears on the game HUD, and take the "E" powerup. Continue walking till the end of the stage. On the "CD BOSS", try not to defeat it, but just make it shorter, so you could jump above it. When done just walk away further beyond the "CD BOSS" to reveal a secret room with some developer's logo: "UBC ERTW: ENGINEERS RULE THE WORLD".

(UNI) More deveolpers messages ultra easter egg (added 30.10.22):
At "STAGE 9" there are "MANHOLES" on the ground, when you jump on them 7 times you will fall down to the "STEAM TUNNEL". First, open the very first "MANHOLE" and walk left. Collect one "DONUT" item and return back to the main stage. Go to the very end of the Stage, and open the "MANHOLE" right before the exit door. See the crate just under the "MANHOLE" you falling above. Jump off to the floor, then stand where the "CRATE" is. Now, input "DUALDUAL" cheat described above to switch to the another character. Note, if you didn't take the "DONUT" item you may need input cheat "USUALBASDARDS" instead, this will work the same. Now, walk the to the right, and you will see the secret "GARAGE" with a car with "E" on it and the same "ERTW" on the wall. This is not just an empty secret room. Enter one of the wollowing button sequences, no need to pause the game, to reveal more easter messages:

Left, A, Right, Down, A, Select, Select	-	"ROB MCKAY IS A GREAT GUY"
B, Left, A, B, Left, A, B, Left, A	-	"JOHAN LOVES EVIE!"
Down, A, Left, Left, A, Select	-	"MIKE HYLUNDS "WHAT AN AWESOME DUDE""

We're Back!: A Dinosaur's Story (USA), Baby T-Rex (Europe), Agro Soar (Australia), Bamse (Sweden)

(FIX) Cheat sequences:
All cheats should be entered at the title screen. You can enter any number of cheats, all effects will be combined.

Select, A, Down, B, Up, Down	-	Infinite lives.
Up, Down, Up, B, Left, B	-	Infinite time.
Select, Up, Up, Select, Left, Left	-	Stage select.
Right, A, Down, Right, A, Down	-	Invincibility.
B, A, Right, B, A, Right, A	-	Infinite projectiles.
Up, B, A, Down, B, A	-	All cutscenes and Credits. This cheat is actually working only in the Australian and the European versions. Other versions has it, but entering this cheat will hang the game. However, for the Sweden version the Game genie code 002‑7EF‑C4D may be used to re-enable it, but unfortunately you can see only the last cutscene screen which is replaces the Credits in this version.
Left, A, Left, B, Left	-	Credits. This cheat actually working only in European version. There is no such cheat in Australian version at all, for the rest of regional versions this cheat should show the credits, but does the same as a previous one: nothing (unless you are using the Game genie code for the Sweden version).

Source: gamefaqs.com

Wedding Peach: Jamapii Panic

(GEN) Sound test (added 05.11.22):
Enter the "CONFIG" screen. Put cursor either to the "BGM"\"SE" "ON\OFF" options then toggle them 10 times with Left\Right. Intead of "ON\OFF" text the number will be displayed. Now use the same Left\Right to play corresponding "BGM"\"SE".
Source: gamefaqs.com

Wild Snake (USA), Super Snakey (Japan)

(UNI) Advanced setup menu (added 30.05.22):
At the Main menu, input B, B, B, Up, Down, Up, Down, Up, Down, B, B, B, Down, Down, Down, Up, Up, Up, the advanced Setup menu will apears. The number and kind of the settings depends on the selected game difficulty. For "KING-COBRA" game mode this menu have more different options since the game mode and mechanics are little bit different from the other game modes.

Winner's Horse

(GEN) CRAM clear (added 08.11.22):
Hold A + B + Up before poweing up the console and wait for the "MESAYA" logo appear.

(UNI) Hidden trainer (added 08.11.22):
There are 5 trainers in this game which may train your horse to increase various parameters. However, there is a hidden 6th trainer. To use it, start a game, go to the main menu, select "トレーニングをする" ("MAKE TRAINING"), then put cursor to "トレーナーをやとう" ("CHOOSE TRAINER") option and presss Start + Select + A + Left at the same time. If done right, when you press Up on the trainer selection screen you will see a hidden trainer with name "KATSU YAMAMOTO", his description is "This is a secret what a result of my training. lol". Every time you use this trainer parameters may either increase slightly or decrease.

(UNI) Secret names (added 07.11.22):
Input one of the following words as a Horse name at the Name input screen to get a corresponding effect. Fun fact. If you leave the name empty, default name will be "名前くらいつけろ".

ヨネヲノコハ　オヨネ	-	Set the current horse to a maxed out parmeters with name "なにをゆうとる！".
ホヘヘヘヘヘヘヘヘッ	-	Sound test.

Winter Gold (Rerelease), XVII Olympic Winter Games, The: Lillehammer 1994

(UNI) Secret credits (added 12.11.22):
At the "Unexpected development" license screen, quickly, hold %A%, press Right, additionally hold B, press Up, release A, press Left, and finally again hold %A% and press Down. Wait for the developer's credits screen appear, it will have a different portions of credits at "GOOD ART BY" and "FUN AND FASHION BY" sections.

Wizardry Gaiden 1: Suffering of the Queen

(GEN) CRAM clear (added 07.12.22):
At the title screen, press Select + B at the same time.
Source: urawaza.in, gamefaqs.com

(BUR) Hidden text (added 12.12.22):
There is an unused error message at $4FA6:

ITEM ERROR

Also next to it an unused resource to not-implemented or removed Sound test menu. There is no code associated with this text.

---CONFIGRATION---
 MUSIC PLAY
 SOUND EFFECT
 VISUAL EFFECT

Wizardry Gaiden 2: Curse of the Ancient Emperor

(GEN) Sound test and Monster viewer (added 12.12.22):
Start a new game, go to "TRAINING" option, create a new character and input as a name " -WIZ- ". Note, there must be spaces before and after a word.
Source: urawaza.in, gamefaqs.com

Wizardry Gaiden 3: Scripture of the Dark

(GEN) Sound test and Monster viewer (added 13.12.22):
Start a new game, go to "TRAINING" option, create a new character and input as a name " -PIN- ". Note, there must be spaces before and after a word. W♥W-Extra 6 lives.
Source: gamefaqs.com♥2♥-You can have more than 10 lives, no limit.Source: urawaza.in, gamefaqs.com

WordZap

(GEN) Ending animations (added 19.12.22):
At the title screen, input Select, A, Left, A, Down, B, A, Right to intantly watch all ending animation sequences for "WORLD HAI" game type in "CHALLENGE PLAY" mode.
Source: gamefaqs.com

(UNI) Alt letters mode (added 19.12.22):
When you play "WORD ZAP" game in "NEXT LETTER" mode, the only letters available to select are the nearest to the currently selected letter to the left, right, up and down. However, if you put cursor to "NEXT LETTER" mode either on "SOLO" or "2 PLAYERS" options, hold Left + Select + B and then press A or Start, the letter selection mode will change. You'll be able to select also a diagonally aligned letters to the letter you selected.

World Beach Volley: 1991 GB Cup (Japan), World Beach Volley: 1992 GB Cup (Europe)

(FIX) Sound test (added 21.12.22):
Enter either "410114", "566290" or "246810" as password to access the Sound test screen.
Source: urawaza.in, gamefaqs.com

World Heroes 2 Jet (USA), Nettou World Heroes 2 Jet (Japan)

(GEN) Takara logo cheats (added 18.09.20):
At the Takara Logo, input one of the following cheats to get a corresponding effect. A sound will confirm correct code entry.

Right, Left, A, B, Down, A, B, Up	-	Scorcher mode.
Up, B, A, Down, B, A, Left, Right	-	Message Test mode.

Source: gamefaqs.com

(UNI) Title screen cheats (added 18.09.20):
At the title screen before the "PRESS START" message appears, input one of the following codes to get a corresponding effect. Note, all these cheats are working only in Super Game Boy mode.

Up, Up, Select, A, Down, Down, Select, B	-	Speed mode. Speed up the game using the SGB CPU. Source: gamefaqs.com
Up, Down, Left, Right, Select, A, Select, B	-	Auto play mode. Both players in any game mode will be CPU controlled.

(BUR) Game genie (added 18.09.20):

101‑06E‑C42

Re-enable additional logo screen "THE 4MEGA SHOCK" after "TAKARA" logo at the game start.

Worm Visitor (Unlicensed, Sachen 4-in-1 Vol.5)

(UNI) Ending and credits (added 12.05.16):
At the title screen, hold A, press and release B twice, release A, hold B, press and release A twice, release B, finally press Start.

(UNI) Secret credits (added 12.05.16):
Complete the game, or just enter the "Ending and credits" cheat as described above. At the credits roll, enter the same cheat again to acces the secret ending with more deveoloper names in Chinese.

WWF Superstars

(BUR) Hidden text (added 09.01.23):
There is a hidden copyright message in ROM at 0x007D1F for the US version and at 0x007427 for the Japanese version:

* Written by Paul Machacek for RARE LTD ** July - October 1990 *

Source: tcrf.net

WWF Superstars 2

(UNI) Secret message (added 09.01.23):
Start a new game in any mode. Before the fight, there are a wrestlers presentation windows appears. First presented the left team, then goes "AND HIS/THEIR OPPONENTS..." and then the right team presentation. Just after first presentation before the intermediate message, quicky press and hold Left + Select + Start. In addition to a regular message you'll see a couple of credits of the developers. In the Japanese version most of the names were replaced with "MADE IN USA [BY] SCULPTURED SOTWARE".

WWF Warzone

(UNI) Secret passwords (added 11.01.23):
Input one of the following words as a password and press Start. If done right you'll hear a sound different from those when you just enter an incorrect password but the message about incorrect password will be displayed and the current cursor will set to the beginning of the word. Next time you enter the same word as a password you'll just hear a regular incorrect password sound and message. When you enter one of these passwords you can enter any other as much as you want.

PNCHCNP	-	Always do powerful punch.
GRNDNRG	-	Opponent laying on the floor will never do any actions, like in TRAINING mode.
FLTRTLF	-	Something about defeating or attacking the enemy jumping from the fence. {Investigate}
FNRGRNF	-	2 times faster energy restore.

X

(GEN) Cart RAM clear (added 13.05.20):
At the title screen, enter B, Right, B, A, Down.
Source: tcrf.net, 2Tie

Xenon 2: Megablast

(UNI) Invincibility (added 13.01.23):
At the title screen, input Down, Up, Left, Right, B, Select, Up, B, then start a new game. There is no indication of correct code entry. If done right, the HP meter will be freezed.

Yogi Bear in Yogi Bear's Goldrush

(GEN) Level select (added 19.01.23):
At the title screen input Up, Down, Left, Right, Right, Right, Up, Down, Right, Left, Left, Left, B.
Source: gamefaqs.com, tcrf.net

Yomihon Yumegoyomi: Tenjin Kaisen 2

(GEN) Auto skip (added 16.06.22):
At the title screen, hold either Up or Down and press Start to activate auto skip option for messages which usually awaits the A button to be skipped.

(GEN) Sound test (added 16.06.22):
Hold A + B + Select + Up before powering the console up. Release after the title screen is shown, then press Start to activate the Sound test instead of Title menu.
Source: urawaza.in

Yoshi's Cookie (USA, Europe), Yoshi no Cookie (Japan)

All versions:

(GEN) Stage select (added 18.02.23):
At the Game setup screen, set "SPEED" to "HI" and "MUSIC TYPE" to "OFF", now put cursor to "ROUND", select round 10, hold Up and press either Select or Right to select round 11. Release all the buttons. Now using Select or Right/Left you may select any round up to 99.
Source: gamefaqs.com

Japanese version:

(UNI) Debug mode (added 18.02.23):
Using the "Stage select" cheat as described above select round 71. Push either Start or A to start the game, but quickly before the "ROUND 71" screen appears press and hold Down + Right + A + B + Select. If done right, instead of "ROUND 71" screen you'll see the "PASSWORD" screen. Input word "HERMETICA!" as a password to access the "HERMETICA DEBUG MODE".

US version:

(BUR) Game genie (added 13.09.18):

001‑DFF‑A2A

Re-enables the debug menu otherwise accessible in the Japanese version via secret code and password (see above). For some reason, the "PASSWORD" screen was completely removed from the US version.

Source: tcrf.net

Yu Yu Hakusho

(BUR) Game genie (added 29.01.23):

010‑8CD‑E6A

Re-enables debug features. During the "STORY" mode dueling, press Start to access the debug menu, you may change a lot of parameters: curent scene, fighters, etc. Press Start again to enter regular ingame menu and then return back to the game.

Yu Yu Hakusho: Ankoku Bujutsukai

(GEN) Unlimited continues (added 11.02.23):
In Taisen mode, at the Continue screen, input sequence Up + Select, Right + B, Down + Select, Left + B to restore continues to maximum. A sound will confirm correct code entry.
Source: urawaza.in

(GEN) Increase items (added 11.02.23):
At the Story mode Opening, hold Select and press Up, Up, Down, Down, Left, Right, release Select and quickly press B. A sound will confirm correct code entry. Every time you do this sequence before Opening is over, POWER and SPEED items are increased. Do this sequence as much as you can to obtain a lot of extra items.
Source: urawaza.in

(FIX) Maxed out characters (added 11.02.23):
There are two characters which may transform in "100% mode" into much more powerful charaters: Kurama and Togurode. To instantly turn these character into the powerful mode, either at "VS" screen in 2-Players mode, or at presentation screens in Tournament or Taisen modes, hold B and press Down, Down, Up, Up, Right, Left, release B and quickly press Select. A sound will confirm correct code entry. Note, this code will work for both players if one of them is a mentioned character.
Source: urawza.in

(UNI) Debug mode (added 11.02.23):
At the title screen, input Down + Left, Up + Left, Down, Up + Right, Down + Right, Select, Up, Down, B, Up + Left, Left, Down + Left, Up + Right, Left, Down + Right, Select, Up, Down, B, B + Select, Select. A sound will confirm correct code entry. Now, any time during the game press Select + A + B to open the complex Debug menu, you can test your current status, see patters and more. Select RETURN to return to the game.

(FIX) Special moves (added 14.02.23):

Char	\|	Move 1	\|	Move 2	\|	Move 3	\|	Unused	\|	Move 5
Uramesi	\|	Left,Down,Right + A	\|	Right,Left,Down,Right + A + B	\|	Down,Down + Right + A	\|	-none-	\|	Right,Left + A
Kuwabara	\|	Left,Down,Right + A	\|	Left,Down,Right,Up + B	\|	-none-	\|	-none-	\|	Right,Left + A
Kurama	\|	Right,Left,Down,Right + A	\|	Left,Right + B	\|	-none-	\|	-none-	\|	Right,Left + A
Hiei	\|	Down,Right + A	\|	Down,Right,Up + Right + B	\|	Right,Left,Down,Right + B	\|	-none-	\|	Right,Left + A
Genkai	\|	Down,Right + A	\|	Left,Down,Right + B	\|	-none-	\|	-none-	\|	Right,Left + A
Rinku	\|	Left,Down,Right + B	\|	-none-	\|	-none-	\|	-none-	\|	Right,Left + A
Chuu	\|	Left,Down,Right + A	\|	Down,Left + B	\|	-none-	\|	-none-	\|	Right,Left + A
Jin	\|	Left,Right + A	\|	Left,Down,Right + B	\|	-none-	\|	-none-	\|	Right,Left + A
Sisiwaka	\|	Left,Down,Right + A	\|	Left,Right,Down + Right + A + B	\|	-none-	\|	-none-	\|	Right,Left + A
Karasu	\|	Left,Down,Right + A	\|	Right,Down + Right,Down,Down + Left,Left + B	\|	-none-	\|	-none-	\|	Right,Left + A
Bui	\|	Down,Right + A	\|	Right,Left,Down,Right + B	\|	-none-	\|	-none-	\|	Right,Left + A
Togurooni	\|	Left,Right + B	\|	Left,Down,Right + A + B	\|	-none-	\|	-none-	\|	Right,Left + A
Togurode	\|	Up,Right,Down + Right + A	\|	Down,Right + A	\|	-none-	\|	-none-	\|	Right,Left + A
tTogurode100	\|	Right,Down,Right + A	\|	-none-	\|	-none-	\|	-none-	\|	Right,Left + A
Kurama100	\|	Right,Left,Down,Right + A	\|	-none-	\|	-none-	\|	-none-	\|	Right,Left + A

Yu Yu Hakusho: Makai no Tobira

(BUR) Game genie (added 16.02.23):

20E‑38F‑80A

Re-enables debug functionality, commonly present in may of TOSE games for GB. During the game, any time, hold A + B, then press Select to open deug menu.

Source: tcrf.net

Yu Yu Hakusho: Makai Touitsu

(GEN) Hidden character select (added 17.02.23):
In "VS/TAISEN" mode, at the character selection screen, put cursor to Enki, then hold B + Select and press Right to play as Raizen. This will work for both players.
Source: gamefaqs.com, urawaza.in

(GEN) Instant S-Class moves (added 17.02.23):
In "VS/TAISEN" mode, at the "VS" screen, hold B then press Up, Up, Down, Down, Left, Right, release B and quickly press Select, a sound will confirm correct code entry. Now during the fight special S-Class movements are available from the beginnig.
Source: urawaza.in

(UNI) Unlimited continue (added 17.02.23):
In "VS/TAISEN" mode, at the "CONTINUE" screen, hold Select, then press Down, Down, Up, Up, Right, Left, release Select and quickly press B. A sound will confirm correct code entry. Now continues will set to 3 instantly.

(FIX) Special moves (added 17.03.23):

Char	\|	Special 1	\|	Special 2	\|	Special 3	\|	Special 4	\|	Special 5
Uramesi	\|	Down, Right + B	\|	Left, Down, Right + A	\|	Right, Left, Right + B	\|	Right, Down, Left + B	\|	Right, Left + A
Kurama	\|	Down, Right + B	\|	Left, Right + A	\|	Right, Down, Right + A	\|	Right, Left, Down, Right + B	\|	Right, Left + A
Hiei	\|	Right, Down, Left + B	\|	Down, Down + Right + B	\|	Left, Down, Right + A	\|	Right, Down, Left, Right + A	\|	Right, Left + A
Syura	\|	Down, Right + B	\|	Left, Down, Right + A	\|	Right, Left, Right + B	\|	Right, Down, Left + B	\|	Right, Left + A
Sigure	\|	Right, Down, Right + B	\|	Left, Down, Right + B	\|	Left, Right + A	\|	Right, Left, Right + B	\|	Right, Left + A
Natsume	\|	Right, Left, Down, Right + B	\|	Down, Right + A	\|	Down, Left, Right + B	\|	Left, Right, Down, Left + A	\|	Right, Left + A
Mukuro	\|	Down, Left, Right + A	\|	Right, Left, Right + B	\|	Right, Left, Down, Right + A	\|	Left, Down, Right, Left + B	\|	Right, Left + A
Yomi	\|	Down, Right + B	\|	Down, Left, Right + B	\|	Right, Left, Right + A	\|	Left, Down, Right, Down + A	\|	Right, Left + A
Enki	\|	Down, Down + Right + B	\|	Right, Down, Right + A	\|	Left, Down, Right + B	\|	Down, Right, Left, Down + A	\|	Right, Left + A
Raizen	\|	Left, Down, Right + A	\|	Right, Down, Left + B	\|	Right, Down, Right + B	\|	Down, Left, Right, Down + A	\|	Right, Left + A

(BUR) Game genie (added 17.02.23):

20F‑EFF‑80A

Re-enables debug functionality. During the game any time hold A + B then press Select to enter the debug menu similar to many others found in games developed by TOSE.

Source: tcrf.net

Yu-Gi-Oh! Duel Monsters

(GEN) CRAM clear (added 18.02.23):
At the title screen, input Down, Up, B, Down, Down, Right, Up, Up, Up, Up, B + Down. A sound will confirm correct code entry.
Source: tcrf.net

(GEN) Disable SGB 2 support (added 18.02.23):
At the title screen, input Left, B, B, B, Up, B, B, B + Right. A sound will confirm correct code entry.
Source: tcrf.net

(GEN) Secret cards (added 18.02.23):
At the title screen, input Up, Down, B, Down, Down, B + Up, B. The password input screen will appear after message. Input one of the following words to obtain a corresponding secret cards which you never obtain during the game.

タカハシカズキ	-	Fairy's Gift
ヤマダノブヒロ	-	Yaranzo
シモマラサトシ	-	Kanan the Swordmistress
チダタクリ	-	Takriminos
ハシモトカナコ	-	Megasonic Eye
ヘイシヨシヒサ	-	Flying Penguin
キタハシカズキ	-	Stuffed Animal
トリシマカズヒコ	-	Seiyaryu
タカハシトシマサ	-	Three-Legged Zombies

Source: urawaza.in, tcrf.net

Zoo Block (Unlicensed, Sachen 4-in-1 Vol.7)

(GEN) Ending (added 17.05.16):
At the title screen, press Left, Right, A, Right, Left, B.
Source: gamefaqs.com

Level:		Power-up:
Magical Cup:		Speed:
Magical Jewel:		Shot range:
Magical Crown:		Shot rate:
Expert mode:		9 Lives:
Password:

Character	Level
Kenshiro:
Heart:
Shin:
Jagi:
Uygur:
Souther:
Raoh:
Falco:
Han:
Hyou:
Kaioh:
Checksum hack:
Password:

Flags:	0102030405060708
	0910111213141516
	1718192021222324
Vars:	1
	2
	3
	4
	5
	6
password: