Mostly Unpublished NES Cheats ;)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.

  AV Jiu Ji Ma Jiang 2
  AV Mahjongg
  AV Hanafuda Club
  AV Pachi-Slot, Hot Slot
  AV Poker (Hacker), Peek-A-Boo Poker (Panesian)
  AV Pretty Girl Fighting, AV Mei Shao Nv Zhan Shi
  AV Soccer, Ultimate League Soccer, Fuetball
  Aa Yakyuu Jinsei Icchokusen
  Abadox
  Abarenbou Tengu, Zombie Nation
  Aces - Iron Eagle 3, Ultimate Air Combat
  Action in New York, Final Mission, SCAT - Special Cybernetic Attack Team
  Addams Family, The
  Addams Family, The - Pugsley's Scavenger Hunt
  Advanced Dungeons & Dragons - Dragon Strike
  Advanced Dungeons & Dragons - Heroes of the Lance
  Adventures in the Magic Kingdom
  Adventures of Bayou Billy, The, Mad City
  Adventures of Captain Comic, The
  Adventures of Dino Riki, The, Shin Jinrui - The New Type
  Adventures of Lolo (US)
  Adventures of Lolo 2 (US), Adventures of Lolo (Japan)
  Adventures of Lolo 3 (US), Adventures of Lolo 2 (Japan)
  Adventures of Rocky and Bullwinkle and Friends, The
  Adventures of Tom Sawyer, Tom Sawyer no Bouken
  After Burner, After Burner II
  Ai Senshi Nicol (FDS)
  Ai Sensei no Oshiete - Watashi no Hoshi
  Aigiina no Yogen - From The Legend of Balubalouk
  Air Fortress
  Airwolf (Japan)
  Airwolf (US)
  Akira
  Akumajou Densetsu, Castlevania III - Dracula's Curse
  Akumajou Special - Boku Dracula-kun
  Aladdin
  Aladdin I/II/4 (JY Company), Popeye 2 - Travels in Persia
  Aladdin 3, Magic Carpet 1001
  Alien 3
  Alien Syndrome
  All-Pro Basketball, Zenbei!! Pro Basket
  Alpha Mission, ASO - Armored Scrum Object
  American Dream
  Ankoku Shinwa - Yamato Takeru Densetsu
  Antarctic Adventure
  Arabian Dream Scheherazade, Magic of Scheherazade, The
  Argos no Senshi, Rygar
  Argus
  Arkanoid
  Arkanoid 2
  Artelius
  Asterix
  Astro Fang - Super Machine
  Astyanax, Lord of King, The
  Atlantis no Nazo
  Attack Animal Gakuen
  Attack of the Killer Tomatoes

Cheats summary:
generic cheats-22
unique cheats-51
buried secrets-29
fixed generic cheats-15
unverified games-0
games with secrets-57
games with no secrets found-30

AV Jiu Ji Ma Jiang 2

(UNI) Slideshow (added 15.09.08):
At the title screen, after "START" message appears press Up, Up, Left, Left, Down, Down, Right, Right.

(UNI) Extra 900 game points (added 15.09.08):
At the title screen, after "START" message appears press Up, Up, Left, Left, Down, Down, Right then press Up + Right. A sound will confirm correct code entry.

AV Mahjongg

(UNI) Slideshow:
Press Left, Left, Right, Right, B, A at the title screen.

(UNI) Easy play:
Press Up, Up, Down, Down, B, A, Start at the title screen. When you will be starting any Mahjong game, you'll be able to choose any option before game.

AV Hanafuda Club

(UNI) Easy play and instant win:
During the game, press Start, Select, Start, Select, B, Start, B, Select, B, B. Press B to choose the card to toss. Press Start to instant win.

AV Pachi-Slot, Hot Slot

(UNI) Disable payout (added 13.02.14):
During the game, when you win something, the machine will payout the prize immediately. You can keep your prize inside the machine as a credit. To do that, before inserting the coins, press Start and immediately press B once (don't hold it) on controller 1, this will not only show you the money you won, but disable the payout for the next winning. You need to do this trick every time after win to keep all your prize as a credit.

(UNI) Slideshow (added 13.02.14):
During the game, before instering coins, press Left, Left, Right, Left, a nude pictures will appear, press Start or A to advance to the next picture.

AV Poker (Hacker), Peek-A-Boo Poker (Panesian)

(GEN) Slideshow:
At the title screen, press Select, Start, A, Up, B, Down. The first slideshow picture will appear after a brief pause. Press A, A, Up, B, Down to see the next one.

AV Pretty Girl Fighting, AV Mei Shao Nv Zhan Shi

(UNI) Slideshow:
Press Up, Up, Left, Right, Down, Down, Up, Down at the title screen. You will see all nude pictures.

AV Soccer, Ultimate League Soccer, Fuetball

(UNI) Slideshow or ending sequence:
At the title screen, press Start once, then during ball animation, but before the team setup appears, quickly press Select, B, Up, A, Down, B, Left, A, Right. For the AV version this will enable the slide show with all nude pictures. For the regular version, this will show the ending sequence.

Aa Yakyuu Jinsei Icchokusen

(UNI) Secret words (added 10.01.08):
Enter as player name:
さうんと-Sound test

Abadox

(UNI) Maximum powerups:
At the license screen (for the US version) or at the title screen (for the Japanese version), press Up, Down, Right, Right, Up, Left, Right, Down, Left, Up, Start. During the game, press Start, Start to get a maximum powerups.

(FIX) Stage select and invulnerability:
At the license screen (for the US version) or at the title screen (for the Japanese version), press Left, Up, Right, Down, Up, Right, Left, Down (stage select only) or A, A, Up, B, B, Down, A, B (stage select, invulnerability, and maximum powerups), then one of the following button codes, to start at the corresponding stage:
Start-Stage 1
Up, Start-Stage 2
Up, A, Start-Stage 2 (midway point)
Left, Start-Stage 3
Left, A, Start-Stage 3 (midway point)
Down, Start-Stage 4
Down, A, Start-Stage 4 (midway point)
Right, Start-Stage 5
Right, A, Start-Stage 5 (midway point)
Select, Start-Stage 6
Select, A, Start-Stage 6 (midway point)
B, Start-Stage 7
B, A, Start-Ending sequence

Abarenbou Tengu, Zombie Nation

(GEN) Restore energy:
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start. Note: This may only be done once per game.

(FIX) Sound test:
Hold Up + A + B at the copyright screen (for the US version) or before the reset or powering on the console (for the Japanese version) on controller 1 and wait for the next screen.

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

(UNI) Special round select (added 13.11.08):
Power on console then press Reset 25 times, at the title screen now press Up, Up, Down, Down, Left, Right, Left, Right, then press Start. You can select any stage or boss to start with, see the ending or enable stage scroll test from menu. Additionally, put cursor at the "EDIT MODE" option, hold A + B and press Start to enable CHR viewer instead of stage scroll test.

(UNI) Invulnerability (added 13.11.08):
Power on the console then press Reset 77 times, then use "Restore energy" cheat to obtain invulnerability instead.

(BUR) Hidden text (added 13.11.08):
The RESET routine in this game uses string
Prg.K_Hiramatsu
to check if game was soft or hard reset.

Aces - Iron Eagle 3, Ultimate Air Combat

(UNI) Secret passwords:
S3CR3T-Ultimate cheat screen.

(BUR) Drum mode:
There is some unused (no visible cross-refrences nether scripts nor direct calls) text similar to secret password message with pause code at the end. Probably was some secret password, but seems "drum mode" was enabled by default in final release.
00057820: 4C 4C 45 20 50 41 52 54 49 45 6A 44 52 55 4D 20 LLE PARTIEjDRUM.
00057830: 4D 4F 44 45 20 41 43 54 49 56 41 54 45 44 6A 46 MODE ACTIVATEDjF
00057840: 31 38 00 46 31 34 00 48 41 52 52 00 2D 2D 2D 00 18.F14.HARR.---.


Action in New York, Final Mission, SCAT - Special Cybernetic Attack Team

Japanese version:

(UNI) Level select and more:
At the title screen, hold A + B on controller 2 and then press on controller 1:
A + Start-Level 2
B + Start-Level 3
Right + Start-Level 4
Left + Start-Level 5
Up + Start-Ending sequence
Select + Start-Extra 10 lives

US version:

(GEN) Level select:
At the title screen, hold A + B on controller 2 and then press on controller 1:
A + Start-Level 2
B + Start-Level 3
Right + Start-Level 4

(UNI) Extra 12 lives:
At the title screen, hold Up + A + B on controller 2 and then press Start on controller 1.

European version:

(UNI) Level select and more:
At the title screen, press A, B, Right, Left, A, B, Up, Down, Select on controller 1 to enable cheats. Then press on controller 1:
A + Start-Level 2
B + Start-Level 3
Right + Start-Level 4
Left + Start-Level 5
Up + Start-Extra 12 lives

Addams Family, The

(UNI) Infinite lives:
Press A, B, B, A, Left, Right, Left, Right at the title screen, "c" letter appears in upper left screen corner.
Thanks to Kitsune for corrections.

(BUR) Hidden text (added 05.12.08):
Most of the games programmed by Ocean shares the same music driver library all along with the hidden version and copyright string:
MUSIC DRIVER V1.0 (C)JONATHAN DUNN & OCEAN SOFTWARE


Addams Family, The - Pugsley's Scavenger Hunt

All versions:

(UNI) Password generator:
Lives:
Random:
Hearts:
Saved:Wednesday
Granny
Uncle Fester
Gomez
Password:


(BUR) Hidden text (added 13.11.08):
Most of the games programmed by Ocean shares the same music driver library all along with the hidden version and copyright string:
MUSIC DRIVER V1.0 (C)JONATHAN DUNN & OCEAN SOFTWARE


US version:

(BUR) GameGenie (added 05.12.08):
GAULAVGK-Re-enables a hidden copyright screens at the game start. This credits is enabled in the prototype version.

Advanced Dungeons & Dragons - Dragon Strike

(UNI) Sound test:
At the first title screen press Up, Down, Left, Right.

(UNI) Japanese version:
At the copyrights screen press Up, Right, Down, Left, Up, Up, Down, Down, Up, Down, Left, Right. Game will reset. From this point all messages will be in Japanese.

Advanced Dungeons & Dragons - Heroes of the Lance

(BUR) GameGenie (added 02.07.13):
AESNNYPA-Re-enable the simple debug mode. At the title screen menu hold Down on controller 2 then press A or B to change the map number. During the game press A on controller 2 to display current map number and other variable.

Adventures in the Magic Kingdom

(BUR) GameGenie (added 28.09.15):
There are three debug routines/helpers still sitting in the game's ROM. Two of them seems meant to be called anytime during the game with currently unexisting button codes to view or change current state of the game data and variables. Third one is for debugging the game message dialogs. All routines can't be re-enabled without some extra hacking, but can be accessed somehow with following GameGenie codes.
GAVYVOGK-Very hacky way to see the debug variables display at the top-left corner of the screen during the game and only if the RAM variable $AA is not zero. There are no proper number sprites left in most of the CHR sprite banks, so you couln'd see something useful anyway.
PTVSUTZE+OYVSKVKK+KYVNSPTE+UZVNVPEA-Use these codes to enter the sprite/palette/music test instead of the quiz mode during the game. This routine starts from the Sprite view mode.
Use Left or Right to change sprite displayed on the screen, It will be displayed animated, but there is no proper CHR bank setup for every sprite, and only the current one is used, so many of the sprites are can't be seen properly.
Press Select + Start to reset the game.
Press Up + Start to enter the Palette/Sound test mode. A set of vertical sprites will be displayed. Again, there are no number sprites, so all numbers are unreadable. You can do the following operations in this mode:
Press Up or Down to move the cursor to the desired palette index from 0 to 15.
Press Left or Right to change selected palette index by 1. Hold A or B in addition to change the hi bits of index.
Press B + Start to select the background palette to edit, press A + Start to select the sprites palette.
The first palette entry number also represents the music/sound track index, press Start to play it. Finally, press Down + Select to exit back to the Sprite view mode.
PTVSUTZE+OYVSKVKK+TGVNSPTE+KZVNVPEA-Replaces the quiz mode with the Message test mode. Press Left or Right to change the message number at the top of the screen (and surprisingly visible), press A to display the message. There are several messages unused in this game.%Indexes $00 and $01 are for the hidden programmers message "ADVENTURE IN MAGIC KINGDOM BY BAMBOO!!! TENTIWOKURAU WO YORUSIKU!!! SATURDAY'S MORNING IS MORNING SALAD". This message can't be seen during the game in other way.
Index $02 is for the dialog window test message with a lines of letters.
Index $03 is unused default "HELLO!" message for the quiz mode people with indexes above 7, but there are only 7 characters in this game that offers you a key for answer the questions. Probably on the early stage they were meant to be on the map all at once and you should find the right one every time, and all characters with no quiz may say the default message. In the final game, there is no one left on the map, when you got this quiz key and no one you can speak with.
Indexes $51-$55 are for unused dialog messages that offers you something instead of the Silver key. So either the one way or another, there should be a game behavior or a side quests that offers you something instead of silver keys. One more evidence for that is the unused graphics on the items screen, in addition to "KEY" string, there are "ITEM" and "PLESENT" strings graphic, which may be one of the prizes instead of Silver keys.

Adventures of Bayou Billy, The, Mad City

English versions:

(BUR) Hidden text (added 24.11.08):
There is a hidden version data inside ROM:
SAMP881226FOR-KONAMI.INC


Adventures of Captain Comic, The

(BUR) GameGenie (added 05.02.14):
ENSSIAEI+LESSTAAA-Somehow re-enables an infinite lives cheat. It should write to the internal variable a zero, but there is no register init for it. So we can just avoid writing the non-zero value to the variable. To enable this cheat, at the title screen hold A + B then press Start.

Adventures of Dino Riki, The, Shin Jinrui - The New Type

(FIX) Continue (added 07.03.07):
At the game over screen hold any D-Pad button then press Start.

Adventures of Lolo (US)

(UNI) Password generator:
Level:
Password:


Adventures of Lolo 2 (US), Adventures of Lolo (Japan)

(FIX) Secret passwords:
CSTM-Customize control settings
PROA-Pro level A
PROB-Pro level B
PROC-Pro level C
PROD-Pro level D

(UNI) Password generator:
Level:
Password:


Adventures of Lolo 3 (US), Adventures of Lolo 2 (Japan)

Japanese version:

(GEN) Secret passwords:
♥SNAKEY+MONSTER♥-Shows Snakey monster
♥LEAPER+MONSTER♥-Shows Leaper monster
♥SKALWG+MONSTER♥-Shows Skalwg monster
♥ROCKY++MONSTER♥-Shows Rocky monster
♥MEDUSA+MONSTER♥-Shows Medusa monster
♥GOL+GOLMONSTER♥-Shows Gal monster
♥ALMARK+MONSTER♥-Shows Almark monster
DONMEDUSAMONSTER-Shows Done Medusa monster
♥CAPOXX+MONSTER♥-Shows Capoxx monster
__00LOLO2BGMTEST-BGM test, type instead __ decimal number between 00 and 23.
__00LOLO2FGMTEST-FGM test, type instead __ decimal number between 00 and 48.

US version:

(GEN) Secret passwords:
♥SN#K☻Y+M!NST☻R♥-Shows Snakey monster
♥L☻#P☻R+M!NST☻R♥-Shows Leaper monster
♥SK#LWG+M!NST☻R♥-Shows Skalwg monster
♥R!CKY++M!NST☻R♥-Shows Rocky monster
♥M☻D*S#+M!NST☻R♥-Shows Medusa monster
♥G!L+G!LM!NST☻R♥-Shows Gal monster
♥#LM#RK+M!NST☻R♥-Shows Almark monster
D!NM☻D*S#M!NST☻R-Shows Done Medusa monster
♥C#P!XX+M!NST☻R♥-Shows Capoxx monster
__00L!L!3BGMT☻ST-BGM test, type instead __ decimal number between 00 and 23.
__00L!L!3FGMT☻ST-FGM test, type instead __ decimal number between 00 and 48.

Adventures of Rocky and Bullwinkle and Friends, The

(FIX) Level skip and free movement (added 04.02.14):
During the game, press B, A, A, Start, A, B, B, A on controller 2. A sound will confirm correct code entry. Then press B on controller 2 to jump to the next level. This code also allows you to free move your character to any position on the screen with the D-Pad buttons of controller 1 instead of jumping. Press Start on controller 2 to switch this cheat off and play the normal game mode. You can enable this cheat any time again.

Adventures of Tom Sawyer, Tom Sawyer no Bouken

(BUR) GameGenie (added 24.08.06):
IANXLOIZ (for the Japanese version)
IEOXAPLL (for the US version)
-Re-enable the Cheat Menu.
To enter to the Cheat Menu press rapidly Up then Down.
This cheat combination was disabled in the final release. It was meant to be enabled with the button code Up, Down, Down, Right, Left, Right, Right, Left, Up, Down, Down, Right, but on development stage it was shorted to first two buttons. Because of oddity of the keypress test routine, the button codes are saved just for a short period, so you need to enter this combination as fast as you can while cheat is triggers. A rapid pressing of this buttons should work at some moment.

After Burner, After Burner II

All versions:

(FIX) Reverse mode (added 06.02.14):
At the title screen, hold B on controller 2 and press Start on controller 1.

(UNI) Hardest mode (added 06.02.14):
At the title screen, hold Right + A + B + Select on controller 1 and Left + A on controller 2 at the same time, then press Start on controller 1.

(UNI) Removed cheat (added 05.02.14):
Just before the game over screen appears, when explosion animation is on the screen, rapidly press A on controller 2. The game will hang before you press A on controller 2 again. It seems that the real functionality was removed.

US version:

(FIX) Sound test:
Hold B on controller 1 before the title screen appears (at the console power up / reset or after the game over screen).

(FIX) Continue:
After the game over screen, when you returned to the title screen, press Left, Left, Left, B, B, B, A, A, Start. You will continue at the previously played level. The Continue code was meant to be 20-button, as in the Japanese version, and to help you enter it the confirming sound were added. It should play if at the title screen you press one more button to the 20-button Continue code. This confirming code is still in the US version and plays sound if you enter Left, Left, Left, B, B, B, A, A, A, A, A, A, A, B, Up, Up, Down, Down, Down, Down, Down, which is full version of the continue code with one more button added. But since in this version the Continue code was shortened just to 8 symbols, this button code isn't much helpful anymore.

(UNI) Extra missiles (added 06.02.14):
At the beginning of the stage 5, while refueling / reloading weapons on the ground, press Up + Right on controller 2 and A + Start on controller 1 at the same time and hold it during the take off. You'll get extra 40 missiles. This cheat was meant to be available at the end of refueling sequences at the stages 3, 5, 11, 16 and 21 with variety of extra missiles (20 or 40) and different button codes for each level, but in the final release there were an additional check added, so this cheat is available only on stage 5, and the button codes for all levels present in the unused array are the same. The Japanese version of that game have similar code without level restriction and button code uses just controller 2.

(UNI) Stage select (added 06.02.14):
During the game, press Select to pause it, then press Down + Left + A on controller 2 and Down + Left on controller 1 at the same time. Press Up or Down to select stage, press Select to play. This cheat can be done in all levels except 8 and 17. But you can still get to these stages with this cheat from any other stages. This cheat was completely removed from the Japanese version.

(UNI) Background test (added 05.02.14):
Hold Left + B on controller 1 and A on controller 2 at the same time before the title screen appears (at the console power up / reset or after the game over screen). Press Left or Right on controller 1 to change the menu options. Press Up or Down to select the menu option. Hold Select to hide menu. This cheat was completely removed from the Japanese version.

Japanese version:

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

(UNI) Continue (added 06.02.14):
After the game over screen, when you returned to the title screen, press B, B, B, B, B, B, B, A, A, A, A, A, A, A, Up, Up, Up, Up, Up, Up, Start. You will continue at the previously played level. If you press additionally to the mentioned button code Up at the title screen, before hitting Start, and the last played game was ended less than on the third level of difficulty, then you'll hear a confirming sound. It means that continue cheat will work. This confirming sound still sitting in the US version but since the Continue button code was shortened just to 8 symbols, the confirming of the 20-buttons code isn't much helpful. ;)

(UNI) Credits (added 06.02.14):
Power the console on, wait for the 6 demo sequences has played, then press A, A, A, A, B, Up, Up, Down, Down, Down, Down, Down, Down, Start. The staff credits from the ending sequence will start. This cheat was removed from the US version, but some portions of code are still there. Fortunately, the ending sequence in the US version haven't any credits and just doesn't wort watching at all. ;)

(UNI) Extra missiles (added 06.02.14):
At the beginning of the stages 3, 5, 11, 16 and 21, while refueling / reloading weapons on the ground, hold on controller 2 the corresponding button code from the table below, and hold it during take off. You'll get extra amount of missiles depending on your current stage. Similar cheat is present in the US version, but available only on the stage 5, and the button code involves the controller 1 too.
Stage 3-Left-Extra 30 missiles
Stage 5-Left + B-Extra 50 missiles
Stage 11-Right-Extra 30 missiles
Stage 16-Right + B-Extra 50 missiles
Stage 21-Down-Extra 30 missiles

Ai Senshi Nicol (FDS)

(GEN) Stage select (added 21.07.15):
At the title screen, hold A + B and one of the following buttons and press Start to begin from corresponding level.
Right-Stage 2
Left-Stage 3
Source: ReyVGM

(GEN) Game pause (added 21.07.15):
Normally, when you press Start on controller 1, you access the items screen, but can't see the level anymore. Hold A on controller 2 additionally before pressing Start on controller 1 to just pause the game, without entering the items screen.
Source: ReyVGM

Ai Sensei no Oshiete - Watashi no Hoshi

(UNI) Sound test (added 29.06.13):
Hold A + B + Select on controller 1 then press Reset.

Aigiina no Yogen - From The Legend of Balubalouk

(GEN) Invincibility:
At the very first cave (Cave of Gize), reach the fourth room (it has fire and different music), pause the game and on controller 2 press A, B, B, Right, Up, Left, B, B, B, Left, Up, B, B, Right, Up, Down, Right, Right, Down, B, Right and then unpause.
Source: ReyVGM

Air Fortress

Japanese version:

(GEN) Second quest:
Enter as password words "GYUW", "AGOG", and "OOON" in sequence. Press Start after entering each word. Now enter any of the Second quest passwords or reset the console to play the Second quest from start. These passwords are unlockable and will be given to you after you beat the game. In the US version in other way, the second quest is unlocked automatically after you beat the game once and all passwords which you obtain during the Second quest will enable the Second quest levels automatically too. In the Japanese version you must enter these three passwords first every time, in order to play any of the Second quest levels.

Airwolf (Japan)

(FIX) Stage select (added 08.02.14):
At the title screen, press Up, Down, Left, Right, A, B, A, B on controller 2, then Start on controller 1. The stage select will appear before the weapon select screen.

(GEN) Music test:
At the title screen, press Up, Down, Left, Right, A, B, A, B on controller 2, then press A + B + Start.

(GEN) Invulnerability:
Start a new game. Hold A on controller 2 when the helicopter drop-off point appears, then press Up, Left, Down, Right, Down, Left, Up, Right on controller 1.

Airwolf (US)

(UNI) Skip to the last mission (added 29.06.13):
At the title screen, hold Up + B on controller 2 then press Start on controller 1.

(UNI) In-game pause (added 29.06.13):
During the game, press Select + Start on controller 1 to pause it. Press any button on controller 1 to unpause.

Akira

(UNI) Quit any time (added 21.09.16):
During the game, any time while actions selection menu is displayed, press A on controller 2 to jump instantly to the quit menu screen, where you may either select to play the current scene from the beginning or get a password and quit. Note, as against the regular game checkpoints usually at the beginning of the scenes, with this cheat you may save any time and store all the game info in your pass. This seems more like a debug leftovers in the final game.

(BUR) Game Genie (added 21.09.16):
XTXKVYAV-Re-enables the debug scene skip. Any time during the game press B on controller 2. Note, that if you use scene skip at the game over or the password screens, you'll get to the ending screen, which is the last possible scene to get to.
GEVENXGK-Re-enables the ability to fast forward the current message output by pressing A on controller 1.

Akumajou Densetsu, Castlevania III - Dracula's Curse

(FIX) Sound test:
At the title screen, hold A or B or both buttons then press Start.

(GEN) Secret words:
Enter one of following words as player name:
HELP ME-Ten lives
AKAMA-Expert mode
OKUDA-Start with Alucard
URATA-Start with Sypha
FUJIMOTO-Start with Grant

(BUR) GameGenie:
YAUTAGZA-Enable "Debug menu" right before game start. You can select one of four rows by pressing Select and using A or B change it's values. First row represents a stage number to start with. Second row represents an act number for selected stage. Third row represents exactly which room you wanted to start with unused selected stage and act. Last option allow you to choose your partner. To start the game, press Start, but you will start with no extra lives, so you get a game over the first time you die.
Source: tcrf.net

Akumajou Special - Boku Dracula-kun

(GEN) Easter egg:
At the title screen, input the Konami code Up, Up, Down, Down, Left, Right, Left, Right, B, A. If you entered the code correctly, you'll hear a sound go off. Press Start and you'll get a black screen with the text "zannen deshita. nanimonai yo-n!", which means "too bad. there's nothing here!".

(BUR) Copyrights check (added 05.10.07):
As most games by Konami made after 1991 year game contain simple copyrights check, testing some parts of CHR and some bytes of PRG data. Then enables "no enemies" mode from second level.

(BUR) GameGenie (added 28.03.16):
ZZSKYGSZ+NLVGAGEU+ZASKZKZA-Re-enables the stage select screen after the title screen instead of main menu.
PAVLSYAA-There were more than one cheat meant to be available at the early developement stage. But later only Konami Kode easter is left and all other cheats data were removed. But cheat flag for the second cheat still exists and checking by the program. Using this game genie you may replace the empty Konami code easter with "Extra 50 lives" cheat. Just enther the same Konami code and start a new game for it.

Aladdin

(GEN) Stage Skip:
Pause the game and press A, B, B, A, A, B, B, A then any button to skip directly to the next stage.

Aladdin I/II/4 (JY Company), Popeye 2 - Travels in Persia

(BUR) GameGenie:
PAOEILAA-Enable second game mode "Popey - Travels in Persia"
ZAVVTPAA-Enable "Aladdin" title modifier 2 (usually "III" to the title)
LAVVTPAA-Enable "Aladdin" title modifier 3 (usually the same as "I"/"II")
GAVVTPAA-Enable "Aladdin" title modifier 4 (usually "SPECIAL")

(BUR) Hidden text (added 14.08.11):
Text
. Silvers LIN .
is used as RAM initialization string.

Aladdin 3, Magic Carpet 1001

(UNI) Power up (added 02.07.13):
During the game, every time you press B + Select, the power counter cycles from 0 to 4. So you could be virtually invulnerable if you press these button often.

Alien 3

(GEN) Level skip:
Pause the game and press Left, Right, Up, Down, Left, Right, A, B, A, B to advance to the next stage.

(BUR) Hidden text (added 18.11.08):
There is a hidden copyright message in ROM:
ALIEN3...NINTENDO ENTERTAINMENT SYSTEM.PROGRAMMED BY DARYL BOWERS FOR PROBE SOFTWARE.CHECKSUM FOR ROMS:
There is no checksums as text, probably there was some message but seems there is no cross-refrences to this string in ROM anymore.

Alien Syndrome

(GEN) Level select:
At the title screen, hold Down on controller 1 and Right on controller 2 at the same time, then press Start.

(GEN) Borrowed life:
Start a two player game. Press A + B after running out of lives to borrow one life from the other player.

(BUR) GameGenie (added 09.02.14):
PEOATIAA (for the Japanese version)
PEOAYIAA (for the US version)
-Re-enables the infinite lives cheat. At the player selection screen hold Up on controller 1 and Down on controller 2 at the same time, then press A on controller 1. Instead of number of lives, a "FREE" word will be displayed.

(BUR) Hidden text (added 09.02.14):
The RESET procedure in this game uses the string
OKABE000000000000000050000
to determine if game was hard or soft reset.

All-Pro Basketball, Zenbei!! Pro Basket

(UNI) Faster timer (added 10.02.14):
Hold Down + A on controller 2, then press Reset. Now, timer in game will be 2 times faster. Surprisingly, this cheat exactly the same as in Taito Basketball.

Alpha Mission, ASO - Armored Scrum Object

All versions:

(UNI) Continue (added 16.01.08):
At the game over screen quickly on controller 2 press A, B, Up, Down, B, A, Right, Left.

English versions:

(BUR) Hidden text (added 02.11.08):
Game ROM contains hidden copyright text:
PROGRAM SNK JR. PLANING MR. OBA DESIGN    RAMPTY   DR. GAG MUSIC SUGAR


American Dream

(FIX) Secret passwords (added 10.02.14):
AAAA AAAA
AAAA AAAA
AAAA AAAA
AAAA AAAA
COCO NUTS
-Free map movement. During the game, in the map mode, hold Select then use the D-Pad buttons to walk any place on the map, then release Select.
Source: ReyVGM

Ankoku Shinwa - Yamato Takeru Densetsu

(BUR) Hidden text (added 23.11.08):
There is a hidden copyright text in ROM:
1988ANOTHERltd.
and
Another Ltd. 1988/7/13


Antarctic Adventure

(BUR) Hidden text (added 26.11.08):
There is a hidden version text inside ROM:
RC804 1.0 850301


Arabian Dream Scheherazade, Magic of Scheherazade, The

US version:

(GEN) Secret passwords:
SOUND-Sound test
END-Ending sequence
1W-Level 1
2W-Level 2
3W-Level 3
4W-Level 4
5W-Level 5

(BUR) GameGenie (added 10.02.14):
GASEULEI-Re-enables the debug room select cheat. Press Select to enter the game menu, hold B + Start then press Select again. Continue holding the buttons, use the D-Pad buttons to change the hex number at the bottom-center of the screen, press Select to advance to selected room. This can be done also from control selection screen (press Start during the game), so you just need to hold B and hold Start to enable this cheat.

Argos no Senshi, Rygar

Japanese version:

(BUR) Password mode:
There is only text for additional menu item left. There is no passwords in the final version.
00019050: 48 13 0F 14 48 50 10 00 50 00 05 10 0D DA DB C8 .......y.y~..STA
00019060: D9 DB 08 10 4F 55 55 00 08 12 0F D7 C8 DA DA DE RT.....y...PASSW
00019070: C8 D9 CB 00 A6 0F E0 03 B0 06 A5 0F C9 1E 90 01 ARDy..Y|)...B..z


Argus

(UNI) Invulnerability (added 15.11.08):
At the title screen, hold Select on controller 2 then press Start on controller 1.

Arkanoid

(FIX) Level skip:
Any time you want during the game, hold A + Start to advance to another level. This only works up to 16th level.

(GEN) Continue:
To continue on the same level after you run out of lives, hold A + B on the title screen while pressing Select 5 or greater times. Release A + B and press Start.

Arkanoid 2

(GEN) Level skip:
While playing, hold A and press Start to skip levels. This only works up to 16th level.
Source: ReyVGM

(UNI) Continue:
At the title screen, press Down, B, Right, Left, A, A, Up, B.

(UNI) +50% Ball speed:
At the title screen, press Right, A, Down, B, Left, A, Up, B.

(BUR) Hidden text (added 09.12.08):
The RESET routine in this game uses string
MITSUGI
to check if game was soft or hard reset. This is name of main programmer Mitsugi Shimizu. Most interesting that this word writes in PPU memory and then checks after reset.

Artelius

(UNI) Debug mode (added 03.07.13):
Enter the "CONTINUE" menu, then press B, Right, Start, Right, Right, Select, Right, Left, Right, Right, Right, Left, Select, Left, Right, Select. Two-digit number will appears at the borrom-right corner of the screen. Press A to cycle from $00 to $1A, press B to return to continue menu. Numbers from $00 to $19 are level numbers, where you start when load any game. Number $1A will disable the background music.

(BUR) GameGenie (added 11.02.14):
ILVOVXGU-The final credits roll have an unused extra text string ("KAWATA"), which can be seen with this code.

Asterix

(UNI) Cheat menu:
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.

(UNI) Invulnerability:
Input the Cheat menu code as described above, but before pressing Start to return to the main menu, hold Up + Right + A + B. 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.

Astro Fang - Super Machine

(UNI) Level select and infinite fuel (added 11.02.14):
At the title screen, press Up, Up, Down, Down, Up, Down, Down, A then press Start. As the stage map display screen press Select to select any stage. If you press B instead of A in this code, you will no longer care about fuel meter, you still can play even if it is empty.

(BUR) Hidden text (added 12.12.08):
There is some hidden copyright text in ROM:
GAME SOUND (C) COPYRIGHT 1990-03-20 SOFT MACHINE INC Nakakuma Akira
Also this game still contain the leftover text from the planned controller configuration menu, surprisingly, this game was meant to support a special controller device called U-Force.

Astyanax, Lord of King, The

(GEN) Sound test:
At the title screen, press Up, Down, Right, Left, Up, Down, Right, Left, Start.

(FIX) Demo select:
At the title screen, press Up, Up, Up, Down, Down, Down, A, and any other button, no matter which one, just to complete the sequence to 8 buttons, then press Start.

(UNI) Ending sequence (added 12.02.14):
Enter the Demo select cheat. At the Demo select menu press B, B, A, A, B, A, Up, Down, Start. At the end of this ending sequence a Japanese credits will be displayed, for some reason didn't removed from the US version, which is normally didn't displayed during normal game.

(FIX) Stage select:
Press Up, Down, Left, Right, B, B, B, and any other button, no matter which one, just to complete the sequence to 8 buttons, then press Start.

(FIX) Invulnerability:
Press Up, Up, Up, Up, Down, Left, Right, and any other button, no matter which one, just to complete the sequence to 8 buttons, then press Start.

Atlantis no Nazo

(UNI) Debug codes (added 15.11.08):
All codes should be entered at the title screen.
There is three internal counters for three buttons: Select on both controllers counts as the same value, A on controller 2, and B on controller 1. Each time you press one of these buttons, one of internal counters is increasing, regardless of it's order. When group of counters reaches the desired values, the final test performs for the pressed button combinations on both controllers. The program doesn't care which controller you use for the final combination, you can do any buttons on any controllers you wanted, only one condition must be performed: all desired buttons must be held when counters are reached desired values. Note, that when you press the final combination, internal counters continue to increasing, so if you press one of the "counted" buttons as part of the final combination after counters are reached desired values, your cheat won't trigger. So you must not use them in the final combination at all and use any other free buttons, or combine last counted pressing with final buttons held.
Thanks to Joe for corrections.
Skip current zone-Counters condition: Select on controller 2 or controller 1 - 33 times, A on controller 2 - 22 times. Final combination: A + B.
Infinite lives-Counter condition: A on controller 2 - 11 times, B on controller 1 - 22 times. Final combination: not needed.
Invincibility-Counter condition: B on controller 1 - 33 times. Final combination: Up + Down + A + B + Select.
Then press Start on controller 1 to start a new game.

Attack Animal Gakuen

(GEN) Level select:
At the title screen, hold Down + Left then press B on controller 2. A lives counter at the top-left counter will represent selected level number from 2 to 7. Now hold A on controller 1 then press Start to start from the desired level.

(BUR) Hidden text (added 19.04.12):
The RESET routine in this game uses string
C.YAMAMO
to determine if game was soft or hard reset.

(BUR) GameGenie (added 19.04.12):
EASGZZAA-Enable simple memory viewer/editor. At the bottom-right corner of the screen a four-digit address and two-digit data string will appear. Press Start to pause the game then press Left or Right to switch between the digits, A or B to increase/decrease current address by 1, Up or Down to change address/data digits. All changes are applied immediately.

Attack of the Killer Tomatoes

(UNI) Frame advance (added 05.10.08):
Press Start to pause game, then by pressing Select you can advance the game frame by frame.

(UNI) Secret message (added 05.10.08):
After you left last life and before tomatoes eyes animation and message "TRY AGAIN TOMATO FACE" will appear, hold Down + Left + A + B. Instead this message another one appears: "ROB LOVES SANDY". Rob Harris is a programmer of this game.

 

Designed with LAYOUT TECHNIQUES by www.glish.com/css