Mostly Unpublished NES Cheats ;)

red    marked cheats are unique, not listed on any site (tell me if not).
brown marked cheats from various other sources like gamefaqs.com etc, checked and fixed if necessary.
gray   marked disabled or missed cheats buried inside game ROM.

  G.I. Joe
  G.I. Joe - The Atlantis Factor
  Galaga
  Galaxian
  Galaxy 5000
  Gambler Jiko Chuushin Ha - Mahjong Game
  Gambler Jiko Chuushin Ha 2
  Game Party
  Ganbare Goemon Gaiden - Kieta Ougon Kiseru
  Ganbare Goemon! - Karakuri Douchuu
  Ganbare Pennant Race!
  Ganso Saiyuuki - Super Monkey Daibouken
  Garfield - A Week of Garfield
  Gargoyle's Quest II - The Demon Darkness, Red Ariimaa 2
  Gauntlet
  Gegege no Kitarou - Youkai Dai Makyou, Ninja Kid
  Gegege no Kitarou 2 - Youkai Gundan no Chousen
  Geimos
  Gekitotsu Yonku Battle
  Gekitou Pro Wrestling!! - Toukon Densetsu, Tecmo World Wrestling
  Gemfire, Royal Blood
  Genpei Touma Den - Computer Boardgame
  Getsufuu Maden
  Ghostbusters II
  Ghosts'n Goblins, Makai-Mura
  Ghoul School
  Gilligan's Island
  Gimmi a Break - Shijou Saikyou no Quiz Ou Ketteisen
  Gimmick!, Mr. Gimmick
  Goal! 2, Goal! Two, Goal!!
  Godzilla - Monster of Monsters!, Godzilla
  Golf '92, The
  Golf Club - Birdy Rush
  Golgo 13 - Dai 1 Shou - Kamigami no Tasogare, Golgo 13 - Top Secret Episode
  Golgo 13 - The Riddle of Icarus, Mafat Conspiracy - Golgo 13
  Goonies, The
  Goonies II, The - Fratelli Saigo no Chousen, Goonies II, The
  Gozonji - Yaji Kita Chin Douchuu
  Gradius
  Gradius II
  Grand Master
  Great Battle Cyber
  Great Deal
  Great Tank, Iron Tank
  Great Waldo Search, The
  Great Wall, The (Sachen)
  Greg Norman's Golf Power
  Gremlin 2 - Shinshu Tanjou, Gremlins 2 - The New Batch
  Guerilla War, Guevara
  Guardian Legend, The, Guardic Gaiden
  Gun Nac
  Gun Sight, Laser Invasion
  Gun-Dec, Vice - Project Doom
  Gun.Smoke
  Gyrodine
  Gyromite
  Gyruss

Cheats summary:
generic cheats-28
unique cheats-38
buried secrets-37
fixed generic cheats-12
unverified games-0
games with secrets-57
games with no secrets found-27

G.I. Joe

(UNI) Secret passwords:
ZLGMZLGMZ-3 Members, Leader Duke, Maximum level
ZSFXZSFXZ-2 Members, Leader Duke, Maximum level
ZKNZZLBBZ-2 Members, Leader Duke, Maximum level
ZMSCZTSTZ-Sound test
Z1STZNDGZ-Ending sequence

(BUR) GameGenie (added 02.01.08):
PTUAOYZY-Replaces the Sound test mode with the CHR test mode, disabled in the final release.
PENEXTAA-Replaces the Password screen with the old debug stage select menu.
AEKEAAAE-Re-enables the in-game shorctuts. Press Right + A + B to commit suicide or press Left + A + B to skip current level.

G.I. Joe - The Atlantis Factor

(BUR) GameGenie (added 26.12.12):
PEEALLAA-Re-enables the disabled cheat code for the level skip. During the game, press Left + Select to complete the current level.

(BUR) Unused (added 18.04.14):
Hold B, then press Reset. This will clear some internal RAM buffers, but they actually was eraced just before that by the RESET procedure itself. So this cheat does nothing. Probably, at the development stage this meant to be used to clear hi-score table, which isn't present in the final release.

(UNI) Copyright screen (added 18.04.14):
Hold A, then press Reset. This will show the Capcom logo and the copyright screen, that will be showed by the game itself at the game's boot. So, the Capcom logo will be displayed twice. One more seemingly useless cheat, like the previous one, probably intended to keep copyrights if the game was somehow hacked (ant IT IS!).

Galaga

European version:

(BUR) Hidden text (added 08.02.13):
There is a hidden copyright text at the start of the ROM:
TM AND COPYRIGHT 1981 1988 NAMCO LTD.
Another one message is hidden inside the CHR graphics at the second CHR page, tile $CF:
COPYRIGHT NAMCO
The Japanese version of this game have only the CHR part of these messages.

Galaxian

(UNI) Music player (added 04.12.08):
Power the console, press Reset 44 times. Then, hold A + B on controller 2 then press Reset one more time. Screen will changes, at left side of screen will fall flashing in music rhythm tile, until it reaches bottom of the screen you can press Reset again, each 45 pressings will change music. There is total 5 melodies hidden between graphic tiles in CHR ROM. For last two melodies offset in CHR ROM shifted by 128 bytes, or 8 tiles from starting play offset, so you will hear some strange "music" while first 8 tiles with normal graphics will play. It is possible to trigger this player another way. Reset the system only 10 times after power on, then shout in microphone on controller 2 of Famicom console 4 times. This need additional 34 resetting before reaching second melody.

(BUR) Hidden text (added 04.12.08):
There is hidden copyright text in ROM:
COPR.1984 NAMCO HARUHISA UDAGAWA


Galaxy 5000

(GEN) Credits:
Press Left, Up, B, Left, Up, B at the game over screen after using all continues.

(GEN) Cheat menu:
At the title screen, after first alien appear on the screen, press B, Left, Up, Right, B. Start 1 Player game, select controls and press Start. A secret "DR DAVES CHEAT SCREEN" will appear.

(BUR) Hidden text (added 09.07.09):
There is a hidden copyright text at end of ROM file:
(c)1991 Activision. 01/21/91 David J. Ross
for the European version and
(c)1990 Activision. 06/28/90 David J. Ross
for the US version.

Gambler Jiko Chuushin Ha - Mahjong Game

(FIX) Multiple Harutans:
At the game mode screen, select Free Mode. Then at the character selection screen, on controller 2, press Up + B, Up, Right + B, Down, Right, Up, A + B, Left. If done right, a sound will be heard. Now you can pick the Blue Monster (Harutan) from the second players page and pick him as your 2nd and 3rd option too.
Source: ReyVGM

(UNI) Autoplay menu (added 18.04.14):
Normally during the game, only in the Free play mode you could enter the in-game menu by press Select and select either to open all players tiles or enable autoplay. However, you can open the same menu in any other mode if hold Up + Down + Right on controller 1 before pressing Select.

(BUR) Hidden text (added 09.07.09):
There is a hidden version text in ROM:
Thu Jul 28 00:19:00 1988


Gambler Jiko Chuushin Ha 2

(GEN) Multiple Harutans:
At the game mode screen, select Free Mode. Then at the character selection screen, pick the Blue Monster (Harutan) from the second players page. Now, start yelling on the Famicom's microphone while you hit A to pick him as your 2nd and 3rd option too.
Source: ReyVGM

(UNI) Autoplay menu (added 19.04.14):
Normally during the game, only in the Free play mode you can see the opponent tiles using the menu by press Select. In any other mode, however, you can enable this option too, using the 4-Player adaptor for the Famicom. During the game, enable the autoplay mode, then hold for a short time Up + Down + B on Controller 3, to enable the rest of the menu options. Now, you can disable the autoplay mode and open your opponent's tiles.

(BUR) Hidden text (added 09.07.09):
There is a hidden version text in ROM:
ASM-2J 90/09/20=1.02R1


Game Party

(UNI) Cheat controls (added 21.04.14):
Hold A on controller 1 and B on controller 2 at the same time, then press Reset. During any game, except "MIND Q", press Select on controller 1 to enable cheat controls, using D-Pad on controller 2 move the ball in any place, additionally while holding A or B on controller 2 you can move also the player 1 or player 2 rackets in the "AIR HOCKEY" game or lift up or down the ball in the "BASKETBALL" game. Press Start to return controls to normal state and continue playing. If you press Select at the main game menu, the cheat controls will be disabled. Was actually a part of this cheat, involving the additional key press after the game selection, when some flag is displayed, but for some reason isn't used.

Ganbare Goemon Gaiden - Kieta Ougon Kiseru

(FIX) Easter egg (added 21.04.14):
After beating the last boss, at the image where all 4 characters are standing looking to the left, press A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B and you'll see Yae in a Bikini instead of her usual clothes.
Source: ReyVGM

Ganbare Goemon! - Karakuri Douchuu

(GEN) Contine:
At the game over screen, hold A + B then press Start. If done right, you'll continue on the same stage you were in and you'll keep your energy bar, but half the money.
Source: ReyVGM

(GEN) Map screen (added 21.04.14):
During the first person events, press A + B to see the map.

(UNI) CRC test (added 30.10.07):
Hold A + B, then press Reset. After some time message "ごえもん 1ばん" and "こなみ 1ばん" appears. First one is results for PRG CRC test, second one for CHR CRC test. If test fails, then message will be "2ばん".

Ganbare Pennant Race!

(UNI) Secret passwords:
S-Sound test
ふらの-Ending sequence

Ganso Saiyuuki - Super Monkey Daibouken

(GEN) Level select (added 24.04.07):
At the title screen, by pressing combinations of A or A + B you may select game area then press Start to enter it. Some of this codes are unlockable passwords in game.
A + B-Area 1
A + B, A-Area 2
A + B, A + B-Area 3
A + B, A, A-Area 4
A + B, A, A + B-Area 5
A + B, A + B, A-Area 6
A + B, A + B, A + B-Area 7
A + B, A, A, A-Area 8
A + B, A, A, A + B-Area 9
A + B, A, A + B, A-Area 10
A + B, A, A + B, A + B-Area 11
A + B, A + B, A, A-Area 12
A + B, A + B, A, A + B-Area 13
A + B, A + B, A + B, A-Area 14
A + B, A + B, A + B, A + B-Area 15

Garfield - A Week of Garfield

(UNI) Level select (added 22.04.14):
At the title screen, press Up + Left + B on controller 2 to increase the starting level number up to 8, press Start to play from the selected level.

(BUR) Hidden text (added 10.07.09):
There is a hidden copyright text in ROM:
Written by Masashi Itoi. (c) Copyright MARS Corporation. 1988


Gargoyle's Quest II - The Demon Darkness, Red Ariimaa 2

(UNI) Secret passwords (added 26.07.13):
14142135-1732050-Start a game with extra 9 lives and all magic available.

Gauntlet

(GEN) Soft reset:
During game, press A + B + Select + Start.

Gegege no Kitarou - Youkai Dai Makyou, Ninja Kid

(UNI) CRC test (added 26.07.13):
Hold any button on controller 2 then press Reset. The game will test PRG and CHR ROMs consistency with 16-bit checksum. If the PRG test fails, then screen will locked with the red color. If the CHR test fails, then screen will be blue. If all is ok, then game will continue as usual. The US version has the checksums from the Japanese version, so PRG test don't pass.

(UNI) Unlimited lives (added 26.07.13):
Hold on controller 1 Left + B, press Reset, release the buttons.
Hold Right + B, press Reset, release the buttons.
Hold Up + Down + Left + B, press Reset, release the buttons.
Hold Down + B, press Reset, release the buttons.
Hold Right + B, press Reset, release the buttons.
Hold Up + Right + B, press Reset, release the buttons.
If all done right, the live counter won't be decreasing after death. Note, if you write down the button codes for this cheat: 42 41 4E 44 41 49 in ASCII, you'll get the string "BANDAI".

Gegege no Kitarou 2 - Youkai Gundan no Chousen

(BUR) GameGenie (added 22.04.14):
PAKKXTAA-Re-enables debug HP refill. During the game hold A on controller 2 for some time.

Geimos

(BUR) GameGenie (added 26.12.12):
AEEIXKNY-Enable debug feature to record replay for the demo sequence. Since offsets are set for the ROM data, you cannot actually record something.

Gekitotsu Yonku Battle

(BUR) Hidden text (added 08.02.13):
There is an unused text sting at the end of some PRG banks:
JECT DMA ADDRESS 2E4H
Additionally, this game contains a few of source code lines, used as padding:
24,$24,$24,$24,$24,$24
;COKL5	.BYTE	$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24,$24
;	.BYTE	$24,$24,$24,$24,$2
and
	STA	WORK1
	TYA
	AND	#$FE
	ASL	A
	ROL	TEMP1
	ASL	A
	ROL	TEMP1
	ASL	A
	R


Gekitou Pro Wrestling!! - Toukon Densetsu, Tecmo World Wrestling

(GEN) Sound test:
At the title screen, press Up + Left + A + B + Select.

Gemfire, Royal Blood

Japanese version:

(BUR) GameGenie (added 20.07.17):
IGKXEGGG-Adds an additional menu option to the "SAVE/LOAD" game menu: "DEBUG". When used, allows you to adjust any parameters for selected tow and continue the game.
Source: tcrf.net

Genpei Touma Den - Computer Boardgame

(GEN) Flashing Attacks (added 26.07.13):
At the title screen, hold Select then press Start. If done right, the attacks during battle will be flashier.
Source: ReyVGM

Getsufuu Maden

(BUR) All items (added 07.10.07):
The game still performs a check for A held at the game start. In this case it sets up $7D9 and $7DA variables corresponding to the inventory items to $FF. But before game starts this variables are rewritten with $01, so cheat is discarded. Probably this was quick lazy debug feature.

(BUR) GameGenie (added 25.06.08):
SUUSUOKN-Enables some debug features.
In map mode you can press at the same time A + B + Select to clear internal map data for current screen location and will be able to move any position in that region.
In game hold Up + A + B then press Select to cycle through game modes.

Ghostbusters II

(BUR) GameGenie (added 22.04.14):
SEEVLKXT+PKEVGKXT-Re-enables the Stage skip cheat. During the game demo and title sequences, before the player select menu, on controller 2 hold Right + Select and press A, A, A. Release all buttons. During the game, press Select on controller 2 to skip current level till the ending sequence.

Ghosts'n Goblins, Makai-Mura

Japanese version:

(GEN) Continue:
After the game over screen at the title screen, hold Right and press A or B three times, then press Start.

All versions:

(FIX) Level select (added 22.10.07):
At the title screen, hold Right and press A or B three times. Release Right and press Up, B, B, B, Left, B, B, B, Down, B, B, B, Start. After player screen, a number and letter will appear. Press A or B to select starting level and press Start to begin from the selected level.

(FIX) Credits message (added 22.10.07):
Complete both quests, then at the "...CHALLENGE AGAIN!" screen press A, B, Up, Down, A, B, Left, Right and wait for "GAME OVER" message.

Ghoul School

(UNI) Debug mode (added 09.12.07):
At the "Electro Brain presents" screen press quickly B, Up, B, B, Left, Select. You can select any game screen or level to start, play sound or game music, and after start you will have all items in inventory.

Gilligan's Island

(UNI) Episode select (added 26.07.13):
At the episode number screen, hold Down + Right + B on controller 2, then press Down on controller 1 to increase the episode number from 1 to 4.

Gimmi a Break - Shijou Saikyou no Quiz Ou Ketteisen

(GEN) Player select (added 23.04.14):
Start a game with the regular controllers, don't plug the special quiz buzzers controller. Before the second round of the Quiz game, you should select the player who will play agains the Quiz King. Press Up + B to select the left player instead of the King, and press Down + B to select the right player. You can select the same opponents. Press A to play this round with selected players. This is an unlockable, the game will tell this secret to you after you beat two rounds normally.

Gimmick!, Mr. Gimmick

All versions:

(GEN) Music sampler:
At the title screen, hold Select and press Start.

Japanese version:

(BUR) GameGenie (added 24.04.14):
ZEETLZPS+ZEETLZPS-Re-enables the debug cheats. During the game press Select on controller 1 to refill HP. On controller 2, press A + B to increase lives. Use the D-Pad buttons will warp to one of the four level's checkpoints instantly. Press B to win current level and return back to the map with bad ending. To enable the good ending hold additionally A.

European version:

(BUR) GameGenie (added 24.04.14):
PAVVTZAA-Re-enables the debug cheats. On controller 2, press press A to refill all items and HP. Use the D-Pad buttons will warp to one of the four level's checkpoints instantly. Press B to win current level and return back to the map with bad ending. To enable the good ending hold additionally A.

Goal! 2, Goal! Two, Goal!!

(UNI) Hard mode:
Hold Up + A + B + Select + Start on controller 1 and press Reset. Title name color will change to blue for the Japanese version, or Title background color will changed to dark blue for the US version.

(UNI) Music test:
Hold A + B on controller 2 and press Reset.

(BUR) Hidden text (added 25.04.14):
The RESET routine in this game uses string
GOAL2.JALECO.'92
to check if game was soft or hard reset.

Godzilla - Monster of Monsters!, Godzilla

(FIX) Secret passwords (added 06.01.08):
Note: the passwords uses the number "0", but not the letter "O".
S0UND-Sound test
DESTR0Y ALL M0NSTERS-Boss fight
MAR-Mars level
JUP-Jupiter level
SAT-Saturn level
URA-Uranus level
PLU-Pluto level
NEP-Neptun level
X STAR-X-Star level
START-Game start
START T0 END-Ending sequences
M0NSTER 0-Ghidora fight

(UNI) Password generator (added 03.04.17):
Note, there are a lot of redundancy in this password system. Most of parameters can be invalid (valid stages are from 0 to 7, valid locations not higher than 64, etc...), there are two unused Monsters slots for unused player characters (see tcrf.net). It is possible to generate malformed password without valid structure with almost any data inside, so passwords like "GH1D0RA" are possble (can be generated using the "Hack" option).
Stage:
MonstersAliveLocationLevel
Godzilla:
Mothra:
Unused:
Unused:
Ghidora:
Mecha-Godzilla:
Hedorah:
Gigan:
Baragon:
Moguera:
Varan:
Gezora:
Hack:
Size override:
Extra bits:
Random:
Password:


Golf '92, The

(UNI) Hole select (added 27.07.13):
Hold Down + Left + A + B + Select on controller 1, then press Reset. During the game press Select to switch to the hole select screen.

(UNI) Autoplay mode (added 27.07.13):
Hold Up + Right + A + B + Select on controller 1, then press Reset. Now both players will be CPU controlled.

Golf Club - Birdy Rush

(BUR) Hidden text (added 08.02.13):
There is a hidden copyright message inside the ROM:
copyright (c) 1987 DATA EAST corporation
All rights reserved


Golgo 13 - Dai 1 Shou - Kamigami no Tasogare, Golgo 13 - Top Secret Episode

All versions:

(GEN) Stage Select:
To enable this cheat you must wait until the helicopter demo ends, and wait untli Duke's eyes show up. Press Start to skip to the title screen before the text appears. At the title screen hold Up + A + B on controller 1 and Up + Left + A + B on controller 2, tehn press Start on controller 1. Codes of the levels are in following table:
00-Level 1
02-Level 1a
08-Level 2
0A-Level 3
0E-Level 3a
12-Level 4
1A-Level 4a
1E-Level 5
32-Level 7
38-Level 8
3B-Level 9
40-Level 10
49-Level 13

Japanese version:

(UNI) Lyrics easter (added 28.04.14):
During the game, press Start to pause it. While lyrics is displaying, sing into the microphine on controller 2. If you sing long enough, after the lyrics is over, the game will display your score from 10 to 100.

US version:

(BUR) GameGenie (added 28.04.14):
XTKATPAV+XVUEAIAV-Re-enables the Lyrics easter. Unfortunately, the fonts for this screen were completely rewritten, and since the lyrics and other text are still in Japanese, there is nothing to read, actually.

Golgo 13 - The Riddle of Icarus, Mafat Conspiracy - Golgo 13

Japanese version:

(UNI) Debug menu (added 03.01.08):
Any time during the game, hold Select on controller 1, then quickly press A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B on controller 2. You will be able to select any plot animation or level, also use the D-Pad buttons on controller 2 controls to play music and sound effects.

US version:

(BUR) GameGenie:
IAUKZLYA-Re-enables the debug menu disabled in the final US release. Just reset the console after applying the code.

Goonies, The

(GEN) Continue (added 16.01.14):
At the game over screen, hold Up + A and press Start.
Source: ReyVGM

(BUR) Hidden text (added 08.02.13):
There is a hidden serial and version string at the start of the PRG ROM:
RC809 1,0 860107
for the Console version
RC001 1,0 861128
for the Arcade version.

Goonies II, The - Fratelli Saigo no Chousen, Goonies II, The

Release versions:

(UNI) CRC test (added 30.10.07):
Hold A + B on controller 1, then press Reset. After some time, the message "GOONIES2 ONE" will appear if the PRG CRC test is OK, or "GOONIES2 TEN" if the CRC test fails. The European version of the ROM has the "TEN" message.

(BUR) Secret messages (added 29.04.14):
The Prototype version of this game has the secret message in "TRANSCEIVER" tool, but after the program was redesigned, the player 2 controls merged with the player 1 controls and cheat just isn't available. To enable this in the Japanese version, set the RAM variable $09 to value $07. Unfortunately, not only the controls are unavailable in the US version of this game, but all messages are dummied out. There is only message left in the strings table: "WE'RE SORRY. THE CONTENT HAVE BEEN TAKEN OUT.", but its actually isn't used anymore.

Prototype version:

(UNI) Secret messages (added 29.04.14):
During the game, when you find the "TRANSCEIVER", enter any door, from the menu select the "TOOLS" option, highligh the "TRANSCEIVER" in the tools list, hold Down + A + B on controller 2, then press A on controller 1. One of the 12 secret "KONAMI STAFF!" messages will appear randomly each time you press A, while holding the buttons on controller 2.

Gozonji - Yaji Kita Chin Douchuu

(GEN) Secret password (added 22.12.12):
へゆたむき かはづとびこむ こらはへた-Sound test.
Source: ReyVGM

Gradius

(GEN) Full power-up:
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start. This may only be done once per level.

(GEN) Continue:
Quickly press Down, Up, B, A, B, A, B, A, B, A after losing the last ship on level two or higher.

(FIX) CRC test:
Hold A + B, then press Reset. Game performs self CRC test, if PRG match internal CRC then displays text "KONAMI ONE", otherwise "KONAMI TEN", if CHR match internal CRC, then displays text "GRADIUS ONE", otherwise "GRADIUS TEN". Known European version do not pass the CHR test.

(BUR) Hidden text (added 08.02.13):
There is a hidden serial and version string inside the ROM:
NC810 1,0 860917
for the US version
RC810 1,0 860219
for the Japanese version
NC810 1,0 860917
for the European version.

Gradius II

(GEN) Extra 30 lives:
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A.

(GEN) Sound test:
At the title screen, hold A + B, then press Start.

Grand Master

(BUR) Hidden text (added 17.06.09):
There is a hidden copyright text for sound driver inside ROM:
GAME SOUND(C) 1990-09-10 SOFT MACHINE INC


Great Battle Cyber

(UNI) Ending sequence:
Press Up, Down, B, Right, Down, Up, Up, B at the title screen, then select player and start the game.

(UNI) Extra 9 lives (added 10.01.09):
Press B, Left, Left, Up, Down, A, Right, Up at the title screen, then select player and start the game.

Great Deal

(UNI) Level select (added 28.07.13):
At the stage number screen, press A + B on controller 2 to increase the current game's level.

Great Tank, Iron Tank

(UNI) Password generator (added 29.03.08):
Level Index:
Password:
Note:Smaller indexes leads to farther levels.
There is only 84 save points in game
so many of indexes leads to the same places.


(BUR) Hidden text (added 10.07.09):
There is hidden message inside ROM:
PROG. NO KNT DESU.NINTENDO NO BOKE AHO-KASU SHINE TSUBURERO-FAMICOM NANKA KIRAIDA-!Aho no Mr.T!! Koroshitannen!"
Which means: "KNT's program. Nintendo is a bunch of shitty old fools who should die and go bankrupt. The hell is this Famicom?! I HATE IT! That retard, Mr. T!! I'll kill him!"
Translated by RahanAkero

Great Waldo Search, The

(UNI) Soft reset (added 30.04.14):
During the game, press Select + Start.

(FIX) Stop time (added 30.04.14):
During the game, press B on controller 2 to toggle the timer stop and run again.

(UNI) Search hint (added 30.04.14):
During the game, hold A on controller 2 to scroll to the next hidden object on the screen automatically.

Great Wall, The (Sachen)

(UNI) Sound test (added 30.04.14):
At the title screen, press A on controller 1, then select the music with Left or Right.

(UNI) Extra pts. (added 10.04.10):
During the game, press A + B + Select to add 500 pts to your score.

(UNI) Easter egg (added 10.04.10):
Before the title screen appears, hold A + B + Select. When screen turns black, release the buttons and enter A + Select, B + Select, Select + Start, A + Select, B + Select, Select + Start. Message "SACHEN" will appear on the screen.

Greg Norman's Golf Power

(BUR) Hidden text (added 10.07.09):
There is a hidden copyright text in ROM:
COURSE DESIGNER CONCEPT AND PROGRAM BY SCOTT GUEST 080391


Gremlin 2 - Shinshu Tanjou, Gremlins 2 - The New Batch

Japanese version:

(GEN) Sound test:
At the title screen, press A + Start.
Source: ReyVGM

Guerilla War, Guevara

All versions:

(GEN) Level and difficulty select:
Select a one or two player game, then hold A or B and press Start.

(BUR) Hidden text (added 08.02.10):
The RESET routine in this game uses string
KNT
to check if game was soft or hard reset. Also, there is more hidden texts inside the ROM:
APO? mess
DaDi DaDaDa DaDi
ATHENA ikima--su
MARIchan muzukas
hikute wakanna-i
Ganbarima-----su
Ti-----me Girl!!
Fight ! Fight !!
HoHoHoHoHoHoHoHo
Knt mess
NIKAGETSU DE TSU
KKUTTAN DAZO-
HOMETE HOMETE
 3/9/88 20:0
 BUG GA DEMASSEN
YOUNI ....
Which means: "ATHENA let's GO! Mari-cutey is so difficult I cannae understand. Good luck! Finished it in two months. Impressive, impressive. It looks bugless...".

Japanese version:

(UNI) Hidden game (added 28.06.12):
Enter the Level select mode as described above. Select 5th level, then hold Up + A + B on both controllers at the same time and press Start on controller 1. Minigame "Sasuke vs. Commander", an early game by SNK, will appear.
Source: tcrf.net

Guardian Legend, The, Guardic Gaiden

(GEN) Sound test:
Hold A + B, then press Reset.

(GEN) Messages debug:
At any generic message/hint displaying room, press Select to enter the map/weapons menu, then press Select to exit back to the game, but do not release the button. While holding it, you still can skip the current message line when cursor is blinking with B, but when the last line of the message is displayed and no cursor is blinking, additionally you may press A or B to skip to the next message. The Japanese version version of this game has no range checking for the message index and the game will crash after the last one in library. The US version has this fixed and messages will wrap from the last to the first one.

(GEN) Secret passwords (added 06.05.14):
TGL (for the US version)
えいえるじい (for the Japanese version)
-No action sequences (Unlockable)
Source: tcrf.net

(UNI) Password generator (added 01.02.16):
Items obtained #1:
 Unused
 X23:Y 8 Blue Lander
 X21:Y13 Weap 12
 X17:Y23 Weap 12
 X12:Y22 Blue Lander
 X 8:Y11 Red Lander
 X 6:Y 3 Shield
 X 0:Y 3 Power
 X 1:Y 0 Weap 12
 X12:Y 4 Power
 X16:Y12 Power
 X 8:Y13 Weap 4
Mini-bosses eliminated:
 X14:Y 9 Blue Lander
 X 4:Y11 Weap 6
 X 0:Y 6 Red Lander
 X 5:Y17 Attack
 X 1:Y14 Red Lander
 X 1:Y20 Weap 12
 X 6:Y23 Shield
 X16:Y 3 Weap 1
 X18:Y 1 Attack
 X19:Y 8 Weap 3
 X21:Y 4 Shield
 X18:Y10 Shield
 X17:Y16 Red Lander
 X16:Y18 Weap 5
 X22:Y20 Shield
 X12:Y18 Red Lander
 X12:Y22 Weap 12
 X 5:Y 3 Weap 3
 X 2:Y 0 Blue Lander
 X11:Y 4 Shield
 X12:Y 0 Weap 12
Items obtained #2:
 X 8:Y 9 Weap 1
 Unused
 X 4:Y12 Weap 11
 X 3:Y10 Weap 2
 X 3:Y14 Blue Lander
 X 0:Y 9 Power
 X 0:Y22 Shot Rate
 X 6:Y22 Red Lander
 X19:Y 6 Blue Lander
 X17:Y 2 Weap 11
 X23:Y 6 Weap 4
 X23:Y 3 Weap 5
 X18:Y12 Weap 1
 X20:Y10 Weap 6
 X19:Y19 Weap 8
 X22:Y23 Shield
 X10:Y18 Power
 X14:Y20 Weap 12
 X 3:Y 6 Blue Lander
 X 3:Y 3 Red Lander
 X12:Y12 Shot Rate
 X 2:Y17 Shot Rate
 X16:Y 0 Shot Rate
 X 9:Y19 Weap 9
 X 9:Y14 Weap 10
Shop items bought:
 X13:Y11 Weap 3
 X13:Y10 Weap 7
 X12:Y10 Weap 2
 X10:Y10 Weap 8
 X10:Y11 Weap 9
 X 1:Y18 SR/HRT/W1
 X23:Y21 SR/HRT/W3
 X18:Y 0 BL/POW/W4
 X15:Y12 RL/POW/W5
 X12:Y 5 W7/POW/W6
 Key 1
 Key 2
 Key 3
 Key 4
 Key 5
 Key 6
 Key 7
 Key 8
 Cor 1
 Cor 2
 Cor 3
 Cor 4
 Cor 5
 Cor 6
 Cor 7
 Cor 8
 Cor 9
 Cor 10
 Cor 11
 Cor 12
 Cor 13
 Cor 14
 Cor 15
 Cor 16
 Cor 17
 Cor 18
 Cor 19
 Cor 20
 
 
 
 
 Weap 1
 Weap 2
 Weap 3
 Weap 4
 Weap 5
 Weap 6
 Weap 7
 Weap 8
 Weap 9
 Weap 10
 Weap 11
 Weap 12
 EE Rounds
 Random
 Red Landers
 Max HP
 X Pos
 X Pos
 Attack
 Shield
 Shot Rate
0 Scores
USAJapan


Gun Nac

All versions:

(GEN) Level select:
Enter the "GUN-NAC CONTROL ROOM" mode and set "SOUND" index to "05". Now you can set any level including hidden Level 0.

(GEN) Quick configuration:
Hold A + B, then press Reset.

(FIX) Extra money (added 27.05.11):
After the game start, at the Shop, hold Left + Select, then press A or B to exit it. Instead you'll obtain an extra 10$ and this allows you to buy weapons before the first level. If the Debug mode enabled, this will give you extra 30$.

(FIX) Money to bombs (added 07.05.14):
In the shops during the game, point the menu cursor at the "END" option, then press Right + Start. Instead of exit, the shopkeeper gives you an extra ability to convert every 10$ found during the game into extra bomb. This ability can be bought also during normal game.

(BUR) GameGenie:
PENNOYAA-Re-enables the debug mode. In debug mode you cannot get the good ending, or enable extra ending pictures. At the game boot, at the "NAXAT" logo screen, hold Up then press Start to view ending sequence. In configuration menu, you will be able to select any level by default, a lot mode extra configuration options are available, like weapon and bomb type selection, invulnerability switch. During the game, press Start to pause it, then hold A and press Select to request blue enemy with bomb inside instantly, hold B and press Select to request the same but with weapon inside.

US version:

(UNI) Invulnerability (added 10.11.08):
Wait until the starting cut scene sequence is about to end and hold A + B at controller 1. Demo sequence will continue with additional graphics from the Japanese version removed from the US version and messages "DEATH & NON-DEATH FREE SELECT MODE OK!" (this will enable "Invulnerability" option in configuration menu) and "OPTION DEMO" will appear.

(UNI) Extra ending (added 10.11.08):
After game completion, when the first demo sequence is about to end, but before the credits roll, hold A + B on controller 1 to view ending sequence from the Japanese version removed in the US version. This will enable "Invulnerability" option in configuration menu as well.

(BUR) Hidden text (added 11.07.09):
There is a hidden texts inside ROM:
1990-12-17 USA

 SSS EEE EEE
 S   E   E
 SSS EEE EEE
   S E   E
 SSS EEE EEE

 Y Y OOO U U
 Y Y O O U U
  Y  O O U U
  Y  O O U U
  Y  OOO UUU

 AGAIN!


Japanese version:

(BUR) Hidden text (added 11.07.09):
There is a hidden texts inside ROM:
1990-06-21 MOU
JIKI MASTER-UP,
KOREGA FC SAIGO
NO SIGOTONI NARU
NDA ROUNA,TABUN.
4KAGETUNO KIKAN
DAKARA,KORE! TO
IU SUGOI TOKORO
HA NAIKEDO,ASOBE
RU YOUNA DEKINI
HA NATTATO OMOU
KARA,MAA,YOSITO
SIMASYO. KONDOHA
DOKODE ANATATO
DEAERU KANA?
Which means: "Soon will be promotion. It seems this was my last work for FC. In April I will be moved to another place, not so good as old one. Hope I will be able to play there too. I'm curious where we meet again?".

Gun Sight, Laser Invasion

All versions:

(BUR) Copyrights check (added 05.10.07):
As most games by Konami made after 1991 year all versions of this game contains copyrights check which tests for CHR copyright data presence, copyright title screen text and code for checking the title screen text. If tests fails, the super hard "one-touch" death mode enabled, you will die even by machine gun bullets. The US version of game doing this check, but don't enables protection feature and game continues to work normally.

US version:

(FIX) Extra 9 players:
Highlight "players 3" at the "option" screen. Now you can press any of A, B, Right or Left in any sequence but summary you should press buttons 50 times. With 50th pressing you will hear the sound and number "9" next to "players" will appear. If you miss 50th pressing, try again one more time carefully.

(BUR) GameGenie (added 07.05.14):
AEKVLZPA-Switches the US version to the Japanese version. This changes the options game menu, adding a password option, but removing the scope test and the lives select options. Unfortunately password didn't work in this version at all. This flag doesn't affect the game language.

Japanese version:

(UNI) Secret passwords:
HARD-Hard "one-touch" mode
9PLY-Extra 9 players

(BUR) GameGenie (added 07.05.14):
PEKTTZAA-Switches the Japanese version to the US version. This changes the options game menu, removig a password option, but adding the scope test and the lives select options, where you can use the player lives cheat from the US version. This flag doesn't affect the game language.

Gun-Dec, Vice - Project Doom

(FIX) Debug mode:
Hold A, then press Reset. Any time during the game, press A on controller 2 to enter the stage select / sound test mode. While selecting a stage, the music will change too. Press B on controller 2 to enter the scene test mode. During the game play press Left or Right on controller 2 to decrease or increase the game speed.

Gun.Smoke

(UNI) Change controls:
At the title screen, press quickly A, B, B, Right, Right, Right, Left, Left, Left, Left, Up, Up, Up, Up, Up, Down, Down, Down, Down, Down, Down, Start. You can control the fire direction with D-Pad, instead A or B or A + B.

(FIX) Machine Gun:
At the title screen, press A, A, A, A, Select, Select, Select, Select, Right, Right, Start, after the game start you'll get the Machine Gun with 300 ammo.

(BUR) GameGenie (added 12.12.12):
PUULPANG+KZKLGPVV (for the US version)-Enables Stage Select mode at the title screen. Additionally, hold Up + Select, then press Start to switch to D-Pad control mode, mentioned above.
Source: tcrf.net

Gyrodine

(GEN) Invulnerability:
As soon as the title screen is starting to appear, press quickly Up, Down, Down, Down, Down, Down, Down, Down, Down, Down, Left, Left, Left, Left, Left, Left, Left, Left, Right, Right, Right, Right, Right, Right, Up, Up, Down, Down, Down, Down, Down, Down, Down, Down, Down.
Source: ReyVGM

Gyromite

(BUR) Hidden text:
There is hidden copyright text in ROM:
ROBOT  SOUND
 5/5 1985
HIROKAZU.TANAKA


Gyruss

(GEN) Extra 30 lives:
At the title screen press A, B, Right, Left, Right, Left, Down, Down, Up, Up then start the game.

 

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