Mostly Unpublished NES Cheats ;)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.

  Dai Meiro - Meikyuu no Tatsujin
  Dai-2-Ji - Super Robot Taisen
  Daikaijuu Deburas
  Daiku no Gen San, Hammerin' Harry
  Daiku no Gen San 2 - Akage no Dan no Gyakushuu
  Daisenryaku
  Daiva - Imperial of Nirsartia
  Dalton McGuinty's Kids' Computer Game, M.C. Kids
  Dancing Blocks
  Darkman
  Dash Galaxy in the Alien Asylum
  Datach - Battle Rush - Build Up Robot Tournament
  Datach - Dragon Ball Z - Gekitou Tenkaichi Budou Kai
  Datach - J League Super Top Players
  Datach - Ultraman Club - Supokon Fight!
  Datach - Yuu Yuu Hakusho - Bakutou Ankoku Bujutsu Kai
  Datsugoku, POW - Prisoners of War
  Day Dreamin' Davey
  Days of Thunder
  Deadly Towers, Mashou
  Deathbots
  Deep Dungeon 3 - Yuushi heno Tabi
  Deep Dungeon 4 - Kuro no Youjutsushi
  Defender II, Star Gate
  Demogorgon Monk
  Demon Sword, Fudou Myouou Den
  Densetsu no Kishi - Elrond, Wizards & Warriors
  Derby Stallion - Zenkoku Han
  Destination Earthstar
  Destiny of an Emperor, Tenchi wo Kurau
  Dezaemon
  Diablo (Nanjing)
  Dian Shi Ma Li
  Die Hard
  Dig Dug
  Dig Dug II
  Digger - The Legend of the Lost City, Digger T. Rock - The Legend of the Lost City
  Digital Devil Monogatari - Megami Tensei
  Digital Devil Monogatari - Megami Tensei II
  Dirty Harry
  Dizzy The Adventurer
  Doki! Doki! Yuuenchi, Trolls in Crazyland, The
  Dokuganryuu Masamune
  Don Doko Don
  Don Doko Don 2
  Donald Land
  Dong Dong Nao II - Guo Zhong Ying Wen
  Donkey Kong Country 4
  Doraemon
  Doraemon (Waixing)
  Double Dragon II - The Revenge
  Double Dragon III - The Rosetta Stone, Double Dragon III - The Sacred Stones
  Double Moon Densetsu
  Double Strike, Twin Eagle (Sachen), Shuang Ying (Joy Van)
  Dough Boy
  Downtown - Nekketsu Koushin Kyoku - Soreyuke Daiundoukai
  Downtown - Nekketsu Monogatari, River City Ransom, Street Gangs
  Downtown Special - Kunio-kun no Jidaigeki Dayo Zenin Shuugou!
  Dr. Jekyll and Mr. Hyde, Houma ga Toki
  Dr. Mario
  Dragon Ball - Dai Maou Fukkatsu
  Dragon Ball, Dragon Ball - Shen Long no Nazo, Dragon Power
  Dragon Ball 3 - Gokuu Den
  Dragon Ball Z - Kyoushuu! Saiya Jin
  Dragon Ball Z II - Gekishin Freeza!!
  Dragon Ball Z III - Ressen Jinzou Ningen
  Dragon Buster
  Dragon Buster II - Yami no Fuuin
  Dragon Fighter (Sofel)
  Dragon Fighter (Flying Star, Unlicensed)
  Dragon Quest, Dragon Warrior
  Dragon Quest II, Dragon Warrior II
  Dragon Quest III, Dragon Warrior III
  Dragon Quest IV, Dragon Warrior IV
  Dragon Scroll - Yomigaerishi Maryuu
  Dragon Slayer 4 - Drasle Family, Legacy of the Wizard
  Dragon Spirit - Aratanaru Densetsu, Dragon Spirit - The New Legend
  Dragon's Lair
  Dragon, The
  Dream Master
  Dreamworld Pogie (Codemasters, Prototype)
  Drop Zone
  Duck Tales, Wanpaku Duck Yume Bouken
  Duck Tales 2
  Dungeon & Magic - Swords of Element
  Dusty Diamond's All-Star Softball, Softball Tengoku
  Dynamite Bowl
  Dynowarz - Destruction of Spondylus

Cheats summary:
generic cheats-39
unique cheats-74
buried secrets-46
fixed generic cheats-16
unverified games-0
games with secrets-88
games with no secrets found-44

Dai Meiro - Meikyuu no Tatsujin

(UNI) Sound test:
Press A, B, Up, Right, Down, Left, A, B, Start at the title screen.

(UNI) Cheat mode (added 11.03.14):
At the title screen, select the "START" or "CONTINUE" options, hold A + B and press Start on controller 1. During the game, on controller 2, press A to instantly cleat current level, press B to refill POW meter, press Up to obtain all items at maximum amount (shows the full map, and movig direction as well).

(UNI) Secret passwords (added 06.06.09):
OWARIDAI-Ending sequence

Dai-2-Ji - Super Robot Taisen

(BUR) Hidden text (added 20.01.09):
There is some hidden version text in ROM:
Sirius Works 006
1991.09.27


(BUR) GameGenie (added 09.03.14):
GXKETAIA-Start a new game at the title screen, instead of prolog, you'll start at Sound Sample Editor, follow the instruction on the screen.
YXKEYEAL-One more debug menu with unknown functions, there is no seems the tilemap data left for this screen, only the input handler.

Daikaijuu Deburas

(UNI) Map select (added 06.07.08):
When you completed the game and your last save were between levels 15 and 16, you can use the cheat codes before starting a new game. Don't clear the SRAM data or save any other games to the last save slot to keep this ability. At the title screen, press Start, while intro cut scene is running, press Up, Down, Down, Down, Down, Down, Down, Up, Left, Left, Left, Left, Right, Right, Right, Down, Up, then press Start to select any map for the 1 player game.

(UNI) VS Map select (added 06.07.08):
When you completed the game and your last save were between levels 15 and 16, you can use the cheat codes before starting a new game. Don't clear the SRAM data or save any other games to the last save slot to keep this ability. At the title screen, press Start, while intro cut scene is running, press Left, Left, Left, Left, Right, Right, Right, Right, Down, Down, Up, Up, Down, Right, Left, then press Start to select any map for the versus game.

(UNI) Sound select (added 06.07.08):
When you completed the game and your last save were between levels 15 and 16, you can use the cheat codes before starting a new game. Don't clear the SRAM data or save any other games to the last save slot to keep this ability. At the title screen, press Start, while intro cut scene is running, press Up, Up, Down, Down, Up, Up, Down, Down, then press Start to listen the game music and sounds.

Daiku no Gen San, Hammerin' Harry

Japanese version:

(FIX) Invulnerability (added 19.07.13):
During the game play, press A to jump, while in midair, press Start to pause the game. Now press Up + A on controller 2 and Down + B on controller 1 at the same time. If done right, the game will be unpaused, and invulnerability flag will be toggled on. Your health bar also will be restored to 3. Do the same cheat one more time to toggle invulnerability off and refill the health bar once more.
Source: ReyVGM

European version:

(FIX) Invulnerability (added 12.03.14):
During the game play, press A to jump, while in midair, press Start to pause the game. Now press Up + A on controller 2. If done right, the game will be unpaused, and invulnerability flag will be enabled. Unless of the Japanese version, there is no possible to disable it back nor to refill your health.

Daiku no Gen San 2 - Akage no Dan no Gyakushuu

(UNI) Level select:
At the "Irem" logo, quickly press Up, Right, Down, Left, Up, Right, Down, Left, then start the new game.

(UNI) SE test:
After the "Irem" logo, during the intro sequence, hold A on controller 2 and press Start on controller 1.

(UNI) BGM test:
After the "Irem" logo, during the intro sequence, hold B on controller 2 and press Start on controller 1.

Daisenryaku

(GEN) Sound test:
Press Start on the title screen, select the third option ("マネー") and press B + Select to trigger a sound test.
Source: ReyVGM

Daiva - Imperial of Nirsartia

(UNI) Secret passwords (added 20.12.13):
たたかう-The Final Planet

Dalton McGuinty's Kids' Computer Game, M.C. Kids

(FIX) Suicide (added 27.06.14):
During the game, press Start, then press Select.

(UNI) Player 2 pause (added 27.06.14):
Any time during the game, except the dialogs, press or hold Select on controller 2 to temporarily stop the game.

(UNI) Unlimited lives (added 25.12.15):
Find all 6 secret and access the "Ronald’s PuzzLeWoRlD". In the bonus worlds, collect all arches, do not complete the stage, but die instead. Do this for all three stages, then go to the Ronald and he will give you an infinite lives.
Source: tcrf.net

Dancing Blocks

(UNI) Cheat mode (added 12.03.14):
After the "Sachen" logo disappear from the screen, hold A + Select then press Start. Release A, but while still holding Select press B, Start, A, B, Start, Up, Left, Down, Right, Start, Start, Start, Start, Start, Start, Start. If done right, three huge white kanji "陳關和" will appear on the screen and game will reset. This gives to you, an infinite lives, powerful weapon and ability to fire any direction at once and finally, you can select levels up to 65 with B, A still count up to 30 only.

(UNI) Hidden copyrights (added 12.03.14):
After the "Sachen" logo disappear from the screen, hold Up + Start. Release Up, but while still holding Start press Left, Down, Right, Up, Left, Down, Right, A, B, Select, A, B, Select, Select, Select, Select, Select. If done right, the copyright string will reappear on the screen alone.

Darkman

(UNI) Level select (added 23.06.09):
At the title menu, select the "HI SCORE" option, hold Right on controller 1 then press A or B. Now you will be in "DARKMAN CONTROL ROOM" instead of "RECREATION SYSTEM V1.00" and there will be password needed to access it. Enter "DERMA" as password. Now you can select any game sublevel and boss shooting, including the ending sequence.

(UNI) Soft reset (added 13.03.14):
Any time during the game, except the copyright screen, press Left + Select + Start on controller 2 to reset the game.

(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


Dash Galaxy in the Alien Asylum

(UNI) Secret message (added 02.12.12):
During the game, pull at least 20 movable block to the elevator shaft. You can do this at any floor and continue to pull blocks even after death, no matter. Before the game over screen, all blocks pulled to the elevator are counts. When you pull the last block, a messages will appear, and after that you'll be rewarded with 10000 score points, 10 bombs, 10 keys and 10 detonators.

(FIX) Level select:
Press Up + Left + B + Select at the title screen. Press Up or Down to change the level number. Press Start to begin the game.

(BUR) Hidden text (added 26.02.10):
Game ROM contains the hidden version string:
Wed Sep 13 16:15:54 1989


(UNI) GameGenie (added 22.03.11):
XOOOSKNO+VEOOUKLZ-Brings back the copyright screen from the development stage. There is just "COPYRIGHT SCREEN" and "LICENSED BY NINTENDO OF AMERICA INC." text used.

Datach - Battle Rush - Build Up Robot Tournament

(UNI) GameGenie (added 26.03.14):
LEXKTEIA-Re-enables a complex Debug Menu and Sound Test instead of "FACTORY" menu option.
IPOXGAPO-Re-enables a password entry screen used to generate a Robot.
Source: tcrf.net

Datach - Dragon Ball Z - Gekitou Tenkaichi Budou Kai

(UNI) Selftest (added 22.07.13):
Hold Select on controller 1 and Select + Start on controller 2 at the same time, then press Reset. The game will perform a quick PRG bank switching test, and 8-bit summing for first and last bytes of every PRG bank. If test is pass, then game will continue normal operation. If fails, then screen will turn white and game stops.

Datach - J League Super Top Players

(UNI) Backup mode (added 22.07.13):
At the title screen, hold Select then press Start on controller 1.

(UNI) Credits (added 22.07.13):
At the title screen, hold Down + Left + B + Select then press Start on controller 1.

Datach - Ultraman Club - Supokon Fight!

(GEN) Backup mode (added 22.07.13):
At the title screen, hold Select then press Start on controller 1.
Source: ReyVGM

(UNI) Selftest (added 22.07.13):
Hold Select on controller 1 and Select + Start on controller 2 at the same time, then press Reset. The game will perform a quick PRG bank switching test, and 8-bit summing for first and last bytes of every PRG bank. If test is pass, then game will continue normal operation. If fails, then screen will turn white and game stops.

Datach - Yuu Yuu Hakusho - Bakutou Ankoku Bujutsu Kai

(GEN) Backup mode (added 22.07.13):
At the title screen, hold Select then press Start on controller 1.
Source: ReyVGM

(UNI) Unknown (added 22.07.13):
Any time during the game, hold Start then press Select. The $0469 should be 3 or higher. The mode where it changes is unknown, but present somewhere in the game. This mode sets NMI sub index $7F, the last one, there you can change some values on the screen, seem like some player data editor.

Datsugoku, POW - Prisoners of War

(GEN) Extra 21 lives:
Press A, B, B, Up, Up, Down, Left, Start at the title screen.

(UNI) GameGenie (added 07.07.10):
IPKGAKIY+XTNKGTAV-The GameGenie code enables in-game level select cheat routine. To use it on controller 2 press A to switch level select mode on or off, press Right to cycle from 1 to 5 level number. Then press B to advance to the selected level.

Day Dreamin' Davey

(BUR) GameGenie (added 14.12.12):
TXNLOUOL-Mostly removed cheat screen from the early stage will replace the regular title screen menu. Although, it will work just like regular menu.
Source: tcrf.net

Days of Thunder

(UNI) Hidden message (added 16.12.12):
At the title screen, when "PRESS START TO PLAY" is displayed, hold A, press B 4 times, release A, hold A, press B 1 times, release A, hold A, press B 26 times, release A, hold A, press B 5 times, release A. So this stands for word "DAZE" (D is a fourth letter, E is a fifth, etc...). A "GALERY" screen will appear. Press A to advance to the next secret screen. There is a total 9 secret screens with dot pictures of the game developers.

Deadly Towers, Mashou

(UNI) Debug mode:
Several debugging tools can be activated via the Family BASIC keyboard. Hold A + B on controller 1 along with one of the following keys, then reset the console:
@-CHR RAM test
L-CRC test
M-Monitor adjust
C-Color adjust
T-Timer on
S-Sound check
ESC-Reset
Source: tcrf.net

(BUR) Hidden text (added 02.11.08):
The game ROM contains a funny hidden copyright message:
DISASSEMBLE? HELLO ! THIS IS DISASSEMBLE MESSAGE FOR YOU.
THIS PROGRAM WAS MADE IN JAPAN TOKYO 10 NOV 1986 COPY RIGHT BY
IREM CORP.PROGRAMMED AND LICENSED BY LENAR SPLENDOR
TEAM  GOOD BYE !!!


Deathbots

(UNI) Extra 60 lives (added 26.06.13):
At the copyright or the title screens, press on controller 2 A, B, Start then on controller 1 A, B, Start to begin the new game with extra 60 lives instead of 5.

Deep Dungeon 3 - Yuushi heno Tabi

(UNI) Maximum experience (added 22.07.13):
At the main menu, enter the "Load Saved Game" option, then select any game to play, hold Left then press Start. Release all buttons, then enter the code Up, Down, A, Select, Left, Start, B, Up, Down. All of your 4 characters will now have maximum of 65535 experience points.

Deep Dungeon 4 - Kuro no Youjutsushi

(GEN) Secret words:
Enter this word as player name:
みさりん-After a first battle, you'll gain 27 levels at once.
Source: ReyVGM

Defender II, Star Gate

US version:

(BUR) Hidden text (added 04.12.08):
There is some hidden copyright text in ROM:
 DEBUGED BY TOSHIO SENGOKU  ( Intelligent Systems )  1987/07/31 15:00 


Demogorgon Monk

(BUR) GameGenie (added 14.03.14):
XTKNKYAV-Re-enables the generic type of debug display for many of Waixing's games.

Demon Sword, Fudou Myouou Den

US version:

(FIX) Password screen (added 24.10.07):
At the title screen, hold Up then press A, B, A, B on controller 1. Password code have internal abuse filter, passwords with words "FUCK" or "SEX" at any position always fail.

(GEN) Gain password:
At the game over screen hold Down then press B, A, B, A on controller 1.

All versions:

(BUR) Hidden text (added 14.03.14):
The game using string
Yoshikawa
to determine if it was hard or soft reset.

(BUR) GameGenie (added 14.03.14):
AESNNNNY (for the US version)
AENNONNY (for the Japanese version)
-Re-enables debug leftovers. During the game press B on controller 2 to skip current level. During pause you can add any items and ammo to your inventory by using the D-Pad buttons and A on controller 2, enable the invincibility by pressing Left + B on controller 2 for the the US version or on controller 1 for the Japanese version.

Densetsu no Kishi - Elrond, Wizards & Warriors

(BUR) Hidden text (added 08.02.13):
Almost every bank in the English versions of game starts and ends with the same copyright text:
(C) COPYRIGHT 1987 RARE LTD. ENGLAND.
In the Japanese version the same string present at the start of every bank, but ends with
[ PP + RME ] (C) COPYRIGHT 1987 RARE LTD. ENGLAND.
Additionally, in the Japanese version the RESET routine check if game was soft reset using string
PP + RME
while the English versions have another string there
ThE tAlE
Initial stands for Paup Proctor and Rachel M. Edwards.

Derby Stallion - Zenkoku Han

(GEN) Sound test and CHR viewer:
On the title screen, hold Right + B on controller 2 and press Start on controller 1 to enter a combined sound test/CHR viewer.
Source: ReyVGM

(GEN) Ending sequence:
At the title screen, on controller 2, hold Up + B and wait until the demonstration starts.
Source: ReyVGM

(UNI) Horse stats (added 14.03.14):
During the game, in the stables, select any horse from the left part of the field, then on the info screen on controller 1 press Select, Left, Up, Left, Up, Right, Up, Start to see all numerical parameters of the selected horse.

(UNI) Extra 5bil yen and instant Ending sequence (added 14.03.14):
During the game, in the stables, press B to enter the main menu, enter the last option ("SAVE"), press Select to enter the "TURBO FILE" menu, now on controller 1 press Right, Up, Left, Left, Down, Up, Down, A, after the message about loading, another message will appear, means you have now extra 5 billions yen and you can see the ending sequence instantly without using the cheat above, just wait for the demonstration.

Destination Earthstar

(UNI) Cheat mode (added 17.03.14):
To enable the cheat mode, hold Down + Select and press B, B, B on controller 2 during the game play. Release all buttons and you will hear a sound confirm correct code entry. Then press one of the following combinations on controller 2 to get corresponding effect.
Right + A + Start-Advance to the next level.
Left + B + Select-Repair damage during the space flight levels.
Up + Right + A-Difficulty of the flight levels (?). Need to investigate.
Left + B + Select-Extra 9 lives during the planet flight levels.

(UNI) Easter egg 1 (added 17.03.14):
At the game over screen in the planet flight levels, hold Left + A + B on controller 1 to reverse the "GAME OVER" message to "REVO EMAG" for some strange purpose.

(UNI) Easter egg 2 (added 17.03.14):
During the planet flight levels, when the Shield is obtained, hold A + B on controller 1 then press Up or Down to make the ship rotate around instead of sliding up or down.

(UNI) Disable music (added 17.03.14):
During the game, in the space flight levels, pause then unpause the game by pressing A + B twice on controller 1 to disable the backround music. In the planet flight levels, pause the game by pressing Start or Select then press A + B on controller 1.

Destiny of an Emperor, Tenchi wo Kurau

(GEN) Sima Yi thunder defense:
This is not actually a cheat, the button-code Up, Up, Down, Down, Left, Right, Up, Down need for defending from Sima Yi thunder attack and can be acquired by talking with some people in the game.

Dezaemon

(GEN) Sound Tets:
On the title screen select the 7th option, then press Select + Start to trigger a sound test.
Source: ReyVGM

(GEN) Block Master:
While in the above sound test, press Select + Start once more to end up in a menu with various graphics tests, including a CHR viewer.
Source: ReyVGM

(BUR) GameGenie (added 18.03.14):
XVUSVPAV-Re-enables some unfinished zooming effect for intro or just for some tech fun. There should be some graphics which is displaying with this effect and slowly zooming, but currently it's using the default font data.
XTKIAGAV-Re-enables the debug ingame cheat. During the game press Select to cycle trough the weapons, press A to increase the current weapon power.
PESKPIYE+UKSKZIVG-Some debug display can be seen with this code. Enter the "BLOCK MASTER" mode as described above, then press Select to cycle throug different parameters display, meant to be called during the game play, but there is no proper font data, so even if this called there, it's impossible to see something useful.

Diablo (Nanjing)

(UNI) Secret message (added 25.03.14):
During the game, while in conversation mode, hold Up + Select + Start on controller 1 and skip with A to the end of the dialog. The copyrigh string will be displayed in the dialog box, but the proper graphics or text was removed from this version of the game. This cheat can be found in a couple of Nanjing games on the same engine.

Dian Shi Ma Li

(BUR) Maintenance screens (added 10.12.16):
Although this game has disclaimer at the title screen "FOR AMUSEMENT ONLY", there are some unused maintenance screens inside which usually meant to be used in real coin-op machines to control or adjust statistics and parameters of luck, the main evidence that this game were designed initially for gambling. There are some ram addresses that controls the special screens, which is described in the table below. At the title screen, set any of it to the non-zer value and wait for the demo sequence to enable the corresponding screen.
$0493-The overall game statistics screen.
$04A2-The DIP SWITCHES screen.
Source: tcrf.net

Die Hard

(UNI) Speedup time (added 24.11.12):
During the game, pressing Start brings you to the status screen, where the time is stop. Press A + B + Select while in the status mode screen to run and speedup the time. It will lead to increase locks counters, and then the final time to leave the building. If you skip all this time, the game will over. Also this can be done during staircase events, when the game displays how much time you spent on climbing to another floor of the building.

(UNI) Continue (added 24.11.12):
Immediately after you were killed, before screen fades out, hold Down + A + B + Start. After the game over screen the "Continue" screen will show up. You have only two continues there though.

(UNI) Picture test (added 24.11.12):
At the difficult select screen, hold Up + Left + Select before starting a new game. Press A, but before the new game starts, you'll see all in-game splash screens with just one the same text: "Theo: "Lock one is down, Hans! I Estimate about a half hour to go!".

Dig Dug

(BUR) Hidden text (added 22.03.11):
The RESET routine in this game uses first 16 symbols of generic Namco copyrights
COPYRIGHT 1982 1985 NAMCO LTD. ALL RIGHTS RESERVED
inside the ROM to check if game was soft or hard reset.

Dig Dug II

(GEN) Level select:
Ususally, you can start with any level you already beat during your game. When the title screen stops moving press A + Select + Start to max out the beaten level counter to 72, so you can select any level.

(FIX) Infinite lives:
Enter the Level Select cheat and start on level 15. Kill a single enemy so your score reads 200 points. Kill off all your lives and at the game over screen, press B on controller 2 and A on controller 1 at the same time. Now start your game again and your lives will read "HERANAI".
Source: ReyVGM

(BUR) Hidden text (added 22.03.11):
The RESET routine in this game uses string
K.N.
to check if game was soft or hard reset. Also it contains generic Namco copyrights:
COPYRIGHT 1982 1986 NAMCO LTD.ALL RIGHTS RESERVED


Digger - The Legend of the Lost City, Digger T. Rock - The Legend of the Lost City

(GEN) Morse code cheats:
At the copyright screen, using A you can enter the one- or two-letter Morse codes. The first letter can be either C ("-*-*") or D ("-**"), which stands for "Continue" and "Demo" options which will be enabled. The second letter can be either R ("*-*"), L (*-**) or X ("-**-") which stands for "Rocks", "Ladder" or "Explosives" items which will be added and unlimited. The second letter can be entered only if the first letter is correct. To enter the Morse codes, press A for a short time for "*" and for a long time for "-", so combine short or long continuos pressings in one Morse letter, then wait. If done right you'll hear the Letter dubbed with sound. Enter different combinations of letters to obtain different effects enabled, but no more than 2 effect at once. For example, if you enter "CL", you'll obtain one continue and unlimited ladders. If you enter "DX" letters, then you'll obtain the unlimited explosives, and can watch the full demo sequence for the second cavern, which will show you a complete level walkthrough.

Digital Devil Monogatari - Megami Tensei

(UNI) Easter egg (added 05.05.12):
There is a specific monster encounter appears in the game. It's a BULL, which is flipped upside-down, with "BUG" text on his side. The game contain some Easter egg concerning this "BUG". When you encounter this enemy in battle, hold Down + Left + A + B on controller 2, then select option "AUTO" to start the automatic battle mode. The generic message about your character being fighting with a monster ("ナカジマたちはたたかっている。", which means "Nakajima and others start fighting."), will change to the secret message: "カブちゃんはDEBUGをはじめて。", which means "Cabu-chan begins debugging.".

Digital Devil Monogatari - Megami Tensei II

(UNI) Enemy stats (added 30.04.12):
After the game ending sequence (which is shows you all of bosses/places you've encountered during the game), the screen "END" will appear and loops. But if you hold Up + Right + A + B or Up + Left + A + B on controller 2 and Up + Right + A + B + Select + Start or Up + Left + A + B + Select + Start on controller 1 at the same time, the "END" screen will disappear and you will see all the enemies/bosses/monsters and demons with it's names, levels, HP/MP stats. All monsters are sorted by classes, and by levels from the higher ones to the lower ones. After all monsters are displayed, "DDSII" logo will continuously flashing on the screen, each roll changing colors from the whole colors palette.

(GEN) Sound test:
In a town, stand in front of the building where the save/warp Totems are and enter the building while holding Up + Right + A + B on controller 2. If done right, you'll get a sound test menu instead of the save/warp menu.
Source: ReyVGM

(BUR) Hidden text (added 02.11.08):
The RESET routine in this game uses string
DDSII PRESENTED BY ATLUS & PROGRAMING BY COZY
to check if game was soft or hard reset.

(BUR) GameGenie (added 05.02.13):
GEXYNIEI-Some of the Namco games, which uses the 19 mapper PCB, contains also the specific self-test routine. It can test and initialize the internal RAM buffers. Similar to the other Namco games series, in order to run these tests, you must plug in a special device to the famicom expansion port. This device is much simpler than mentioned another device. It just takes one bit of data and immediately returns it inverted to the data port, there is no FIFOs inside. When the program detects the device presence, it performs RAM test and initialization. If RAM is already tested/initialized, the screen will turn blue. If RAM isn't initialized, but after init and test all is fine, then screen will turn yellow or pink. If, even after the reinitialization, RAM test fails, then screen will turn red. After the tests, program goes to the infinite loop, so yo must unplug special device to boot into the game. Using this Game Genie code you can skip the special device check and just directly to the RAM initialization routine. This game tests it's WRAM.

Dirty Harry

(FIX) Secret passwords:
MYSTY-Level 2
BYRD-Level 3
CLYDE-Invulnerability

Dizzy The Adventurer

(UNI) Smiley test:
Absolutely all games by Codemasters have internal PRG ROM and CHR RAM testing routines. So called "Smiley tests". Tests are normally enabled, but for triggering it needs pressing all D-Pad buttons. Hold Up + Down + Left + Right + A + Select + Start to enter the PRG ROM test or hold Up + Down + Left + Right + B + Select + Start to enter the CHR RAM test, and press Reset. A green smile means that test passed, red sad face - failed.

(UNI) Soft reset (added 18.03.14):
During the game press A + B + Select + Start on controller 1 to return back to the title screen.

(UNI) Free movement (added 18.03.14):
During the game press Start to pause it, then hold Up + A and press Start again. Now, any time hold A + B + Select and move your character using the D-Pad buttons to any location. Be careful, some locations are still deadly.

Doki! Doki! Yuuenchi, Trolls in Crazyland, The

(UNI) Secret passwords:
"DB !"-First ending sequence
"DW *"-Second ending sequence
"!MGB"-Sound test
"Z!N*"-Secret message + Extra 99 Lives (The European version haven't a secret message but 99 lives is still there).

(BUR) GameGenie (added 03.01.08):
LAVINNKO+OTVSEYVS (for the Japanese version)
IUXSNVZL+EVUIETVS (for the European version)
-Choose PASSWORD on the title screen to access a Stage Select menu. Press Left or Right to change the stage number (includes mid-stage checkpoints), B to reset the number to 0, and Start to start the game. You can also choose stage FE to view the first ending sequence, or stage FF to view the second.
Source: BMF54123

Dokuganryuu Masamune

(BUR) Hidden text (added 22.07.13):
The RESET routine in this game uses string
michiya dameyo
to check if game was soft or hard reset.

Don Doko Don

(UNI) Extra 12 credits (added 08.03.09):
At a player select menu press Left + A, Up + A, Right + A, Down + A, Right + A, Left + A, Down + A.

(GEN) Reverse rounds:
Don Doko Don features a hidden password prompt in the very first level. Above the top most platform, jump and swing your hammer. You will see the outline of an invisible bubble. Keep swinging at this bubble to release a key, this key opens a door to the password prompt. You have 15 seconds to input the password, so move quickly. Hammer the jar with the proper card suit display to input each part of the password in this order: Spade, Diamond, Heart, Club, Diamond, Heart, Spade, Club. When the proper order has been inputted, you will be taken to Reverse Rounds.

Don Doko Don 2

(BUR) GameGenie (added 27.09.07):
EAUEAKYG-Enable Stage Select Menu cheat.
To enable Stage Select Menu press A, A, A, A, A, A, A, A.
AGUAAKYG-Enable BGM Test Menu cheat.
To enable BGM Test Menu press A, A, B, B, A, B, A, B.

Donald Land

(UNI) Level select:
At the title screen, before the Ronald has jumped from the window, press A, B, Right, Left at the title screen, then hold one of the following combinations and press Up on controller 1.
A-Level 1 - Home Town World
B-Level 2 - Lake Side World
A + B-Level 3 - Forest World
Select-Level 4 - Sky World
A + Select-Level 5 - Oasis World
B + Select-Level 6 - Cave World
A + B + Select-Level 7 - Pond World
Right-Level 8 - Harbor World
Right + A-Level 9 - Ocean World
Right + B-Level 10 - Ghost Town World
Right + A + B-Level 11 - Dark Forest World
Right + Select-Level 12 - Castle World

(BUR) GameGenie (added 19.03.14):
TEULLSIE-The Level Select cheat be able to display the Ending sequence as well, but seems this was disabled in the final release. With this code you can use the combination Right + A + Select for the cheat above to access the Ending sequence.

Dong Dong Nao II - Guo Zhong Ying Wen

(UNI) Hidden game (added 07.04.10):
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A then press Start to start a hidden "Pyramid" game instead of learning English.

Donkey Kong Country 4

(UNI) JY company's Easter egg:
At the title screen, press Up, Down, Up, Down, Left, Left, Right, Right.

Doraemon

(GEN) Continue:
At the game over screen, hold any D-Pad button (e.g., Up), then press Start.

(FIX) World warps:
At the title screen, press Select on controller 1 a number of times corresponding to the desired level from to table below, then hold A + B and press Start. Note, that if you use these cheats and beat the game, you doesn't see the ending credits. After the final screen the game will return to the title screen.
0 times-World 1 with intro skipped
1 time-World 2
2 times-World 3

(GEN) Super Prize:
At World 1, kill enemies in a particular sequence: KOBUN (Red man with black hat), KOBUN, NAME (Caterpillar), GOZURA (Creature with the tube instead of nose), YUBOU (some kind of UFO), KOBUN, KOBUN. A new prize will appear, it gives you invulnerability for 15 seconds.

(GEN) Programmers Face:
At World 1, go to the final boss building, go to the right of the front door and up in a cavity. Shoot continuosly in the middle of location and shout tho the microphone at the same time. After a while a special item with programmer's face wil appear. It will add you 80000 points.

(GEN) Kill all enemy:
At World 2, after the resque of "Gian", shout at microphone about 3 seconds. All enemies will die.

(UNI) Debug mode and Easter Egg (added 30.01.15):
This can be done only for World 3. Before the World number screen appears, hold Up + Left + A + B + Select + Start on controller 1 and Down + Right + A + B on controller 2 at the same time. During the game use D-Pad on controller 2 to jump to the next screen in corresponding direction. Press A + B on controller 2 to show the Easter screen with blue DORAMI and word "KiKu". You can use World warps cheat to reach World 3, but instead of just A + B you must hold complete combination for Easter at the title screen.
Source: tcrf.net

(BUR) Glitch easter (added 02.02.15):
At World 3, in the very first room, try to swim very close to the leftmost-bottom part of the screen, in a cavity under the rock. Fire continuosly there and shout in the microphone at the same time. The code should jump to some location at the end of PRG bank, but there is no code at all and space filled with $FF. So the game breaks on the BAD opcode and jumps to the reset. So you just return back to the title screen. It is unknown whether this code was removed or unfinished, but this cheat is part of the Debug code handler above.

(GEN) Cave easter:
At World 3, there is a room on third level, seventh from left (index $16) with dead end cave and sandy floor. Shout in the microphone about 2 seconds and in the middle of the cave DORAMI character will appear as well as every single item needed to complete this level.

(BUR) Hidden text:
The ROM contains some hidden copyrights and version info text
DORAEMON WORLD3 WRITTEN BY KIKU VER1.9 86/10/31
"KIKU" is a programmer of HUDSON Kikuta Masaaki (菊田昌昭. He put secret codes with messages almost in all his games under HUDSON label.

Doraemon (Waixing)

(UNI) Stage select (added 20.03.14):
At the title screen, press A, B, Select, Up, Down, Left, Right, A then press Start.

Double Dragon II - The Revenge

All versions:

(BUR) GameGenie (added 20.06.08):
There is some common feature in some Technos games like "SAMPLE VERSION" flag, allowing you to have some extra or debug features in game. Depending var is at $FFF6 address and uses some bits set to enable hidden features.
AXNYVYAA-Bit 5. Enables free level mode, you can walk to any level position any time.
EKNYVYAA-Bit 7. Enables "SAMPLE VERSION" mode. In this mode some debug features available:
In game hold on controller 1 Select then press on controller 1 A to skip current level, B kill all current enemies and advance to next point, Up or Down to kill one nearest enemy at front or back side.

US version:

(UNI) Continue (added 22.05.11):
The Japanese version of this game have "Continue" after the game over screen by default. The US version haven't continues normally, but you can use it with this cheat code. At the game over screen press one of the following combinations to enter the "Continue" mode and start again from the last played level.
on controller 1 Up, Right, Down, Left, A, B-For Levels 1-3
on controller 1 Up, Down, Left, Right, B, A, A-For Levels 4-7
on controller 2 A, A, B, B, Down, Up, Right, Left-For Levels 8~

Japanese version:

(BUR) GameGenie (added 20.06.08):
There is a lot more disabled features in game since development stage. The byte sequence is "A9 00 F0" for such disabled code branches. Just replace 0 to 1 to enable it back. Some of them may cause glitches.
PENNGLAA-Different title menu like in the English versions.
PAKNYAAA-Enables copyright screen as in the English versions, but since there is no latin letters message completely unreadable.
PEKOYGAA-Re-enables difficult limits, do not allowing you play further 4th level on "PRACTICE" and further of 8th level on "WARRIOR" mode.

Double Dragon III - The Rosetta Stone, Double Dragon III - The Sacred Stones

(UNI) Title screen skip (added 23.12.13):
At the "TECHNOS" logo screen in the US version, hold A + B on controller 1 and wait until the screen fades out. There is no such skip in the Japanese version.

(BUR) GameGenie (added 20.06.08):
There is a common feature in many Technos games like "SAMPLE VERSION" flag, allowing you to have some extra or debug features in game. The var is at the $FFF6 address and uses some bits raised to enable hidden features.
EXNYVYAA (for the US version)
EXNYVYAA+XVNXAPAV (for the Japanese version)
-Re-enables some debug features. First, it will enable the free walk feature, so you can walk to any point of the level without need to beat some enemies first. Second, is the pause debug options. During the game, hold Start, then press one of the buttons from the table below to get corresponding effect. Release the Start to apply features. Note, that in the US version you must enable the pause debug mode first. To do that, at the "TECHNOS" logo, hold Down + Left + B and wait until the license screen appears. You don't need to do this in the Japanese version, but most of the debug features was disabled, so you need to enter additional GameGenie code to re-enable the full set.
A-Skip to the next location or Stage.
B-Make all the characters selectable during the game, but doesn't update the selection screen properly, so you couldn't see all the character icons anyway.
Up-Remove the first enemy instantly.
Down-Remove the second enemy instantly.
Left-Restore full health for both players.
Right-Drops health to 0 for both players.

Double Moon Densetsu

(FIX) Playable girl character:
At the main game menu, select the "Start a new game" option (first, then first again), hold A or B on controller 2, then press A on 1.
Source: ReyVGM

Double Strike, Twin Eagle (Sachen), Shuang Ying (Joy Van)

(UNI) Extra 30 lives (added 20.03.14):
A the title screen, press Up, A, Down, A, then start a new game.

Dough Boy

(FIX) Extra 30 lives (added 22.07.13):
Hold Left + A + B on controller 2, then power the console off then on again.

Downtown - Nekketsu Koushin Kyoku - Soreyuke Daiundoukai

(UNI) Watch the game (added 20.03.14):
At the Technos logo screen, hold Up + Select then wait for the title screen. Start a new single player game, 1P must be in the firs position, then setup the game parameters as you like. When all this done right, the game will start with all 4 players being controlled with the CPU, so you can just sit and watch.

(BUR) GameGenie (added 20.06.08):
There is some common feature in some Technos games like "SAMPLE VERSION" flag, allowing you to have some extra or debug features in game. Depending var is at $FFF6 address and uses some bits set to enable hidden features.
AXNYVYAA-Bit 5. The debug display during the game at the top-right corner of the screen.
EKNYVYAA-Bit 7. Enables cheat mode. In this mode some debug features available:
In game hold on controller 1 Select then press on controller 1 A or B to skip current location or win current level accordingly. If you additioanlly press Down with A or B, you can just skip level with your current results/points, so you can loose as well.

Downtown - Nekketsu Monogatari, River City Ransom, Street Gangs

English versions:

(GEN) Easter egg (added 05.10.16):
Start a new game. Go to game menu, then enter "STATUS" screen. Hold Left on controller 2 and Right + Select on controller 1 at the same time. A screen with Riki and Kunio pictures will appear. The same screen still sitting in the European version, but has no proper graphics anymore.
Source: tcrf.net

(GEN) Secret passwords (added 05.10.16):
MShin_____
Technos____
Japan______
-Max out all stats, gives 999,99 money and all books. Also changes first player's name to "Shin" even if you enter this password for the second player.
Source: tcrf.net

Downtown Special - Kunio-kun no Jidaigeki Dayo Zenin Shuugou!

(UNI) Auto fight (added 24.03.14):
At the game mode selection screen before the game start or during the game, move cursor to the character selection option, hold Down + B on controller 1 then press Start. If done right, you will automatically start a new or continue current game, but now when any encounters appear on the screen, you'r character will fight automatically, just like your CPU opponent. Anyway, you still can control it yourself and fight if you want, or travel by your own. You can see if cheat is working, when your character will always turn face-to-face to your CPU controlled player if you stay still a while.

(UNI) Disable AI (added 24.03.14):
As the opposite type of cheat to the previous one, at the game mode selection screen before the game start or during the game, move cursor to the character selection option, hold Right + B or Left + B (according to the game mode you prefer) on controller 1 then press Start. If done right, you will automatically start a new or continue current game. From now, any encounters on any location will be helpless dummies, doesn't able to fight.

(GEN) Secret words (added 24.12.13):
At the game mode selection screen, press Select and enter this word as a player name.
こがねむし-All Techs and 990200 ryo for your characters.

Dr. Jekyll and Mr. Hyde, Houma ga Toki

(GEN) Stage skip (added 22.07.13):
At the title screen, when the title menu cursor points to the "START" option, press B on controller 2, then press Up, B, Right, Left, Down, Right, Left, A, B, Right, Select, B, Down, Start. During the game press A on controller 2 to skip the current level up to the ending sequence, or press B on controller 2 to switch between the Dr. Jekyll and the Mr. Hyde modes.
Source: ReyVGM

Dr. Mario

(GEN) Soft reset:
Press A + B + Select + Start during the game.

Dragon Ball - Dai Maou Fukkatsu

(BUR) GameGenie (added 26.03.12):
NNNYEYAE-Disabled debug feature, allow to skip game cut scenes/events/fights and dialogues. Just press A on controller 2.
NNNYOYAE-Selectable events at the end of each move. Just select one of 5 cards to choose one of events modes.
NNNYXYAE-Disabled level select/continue. Not working properly. Hold A on controller 2 before selecting CONTINUE mode at the title menu.
NNNYUYAE-Disabled fight debug, press Up/Up + B on controller 2 to increase/decrease your health or Down/Down + B to increase/decrease enemy health.
NNNYKYAE-Disables debug feature, allow to move your character without spending moves or triggering events. Just hold A on controller 2 before moving.

Dragon Ball, Dragon Ball - Shen Long no Nazo, Dragon Power

European version:

(GEN) Level skip:
Press B on controller 2 to skip stages.
Source: ReyVGM

(GEN) Refill energy:
Press Down on controller 2 to refill your energy.
Source: ReyVGM

Dragon Ball 3 - Gokuu Den

(BUR) GameGenie (added 26.03.12):
NNNYEYAE-Disabled debug features.
Press B on controller 1 then press Reset to enter fight debug mode.
During fighting events hold A on controller 1 then press Up to select your enemy. Also works holding A then pressing Down or holding Up or Down at the end of move to instant kill player or enemy accordingly.

Dragon Ball Z - Kyoushuu! Saiya Jin

(BUR) GameGenie (added 24.03.14):
YASEGXGA-Re-enables the complex debug settings menu, where you can toggle on/off a lot of various features used to debug the game, such as free map movement, battle win, level skip, etc. Need to investigate.

Dragon Ball Z II - Gekishin Freeza!!

(BUR) GameGenie (added 25.03.14):
NNNKNZAE-Re-enables similar to the Dragon Ball Z debugging flags. Unfortunately, there is no more working menu to modify these flags, so enter this code and just reset the game to have all flags on permanently.
With these flags, using the buttons on controller 2, you can pause battle, win or skip current battles, switch maps, and additionally when script sequence is in progress, a number will appear at the top-left corner of the message window. Press A or B,  , o, n,  2 to change to the different script scenes instantly.

Dragon Ball Z III - Ressen Jinzou Ningen

(BUR) GameGenie (added 25.03.14):
AOSNEYAA-Starts a game with unfinished Tournament Mode. It have numerous issues with menus and graphics, as well as some planned game modes isn't implemented as well and just crashing the game.

Dragon Buster

(GEN) Second Quest:
At the title screen, enter Right, Down, Up, Left, Right, A, B, Start. You'll know the code was entered properly if the background color of the map is red instead of green.

(BUR) Hidden text (added 23.06.09):
The RESET routine in this game uses string
D.BUSTER
to check if game was soft or hard reset. Also the game contains some hidden copyright text at the end of the ROM:
HARUHISA.UDAGAWA & KUMI.HANAOKA


(BUR) GameGenie (added 23.06.09):
GAUYNTEI-There are a series of the Namco games, made by the same programmers Haruhisa Udagawa and Kumi Hanaoka, that contains the same self-test for the data integrity. To enable any of these tests you need a special device that should be plugged into the expansion port. The operation of that device is very simple. It should accept the data bit from the data input port and return it back inverted to the output data port. The device consists of 4-bit shift register, working as some sort of the FIFO buffer. The input bits are goes to the input and then shifted to te output after a 4 cycles. At the game's boot, it tries to send some special data to the device. If the data output doesn't match the data input inverted, then the game continues the normal operation. But if all data (usually 32, rarely 64 bytes) is matches, self-tests will be performed. The program calculates 24-bit partial checksums for the PRG (excluding the last 8K) and the CHR data, summing only every 15th byte, and comparing it against the etalon. Before testing of the PRG data, the background color turns red, before testing of the CHR data, it turns green. If any of these tests are failed, the program will jump directly to the reset routine. It means, one of these tests will be performed infinitely, but until the special device is plugged in, or until the test are passed. Normally, you'll see the red to green flash just before the game's boot. Or the static red screen if the PRG data is bad, or the flashing red to green screen if CHR data isn't good. Using this Game Genie code you can skip tests for the special device presence and jump straight to the integrity tests.

Dragon Buster II - Yami no Fuuin

(BUR) GameGenie (added 23.07.13):
PENNOYAA-Enables a simple debug mode. Press Left / Right on controller 2 to jump to the previous / next level. Hold A on controller 2 then move the character to any location using controller 1 during both map and dungeon modes. During the dungeon mode additionally press B on controller 2 to restore lives and energy and add an extra 16 arrows.

Dragon Fighter (Sofel)

(GEN) Expert mode:
Press A, A, A, A, B, B, B, B, A, B, A, B, A, B, A, B when message "PRESS START" appears on the title screen. Text on the screen will turn red to confirm correct code entry.

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

(UNI) Level select:
Hold A + B button on controller 1 and press Reset, continue holding A + B after the title screen appears about 30 seconds. A sound will notice you that the cheat is enabled and you can release the buttons. Before the demo sequence starts, you can hold one of the following buttons on controller 2 to select desired level and then press Start on controller 1.
Right-2 level
Down-3 level
Up-4 level
B-5 level
A-6 level

(FIX) Restore energy (added 16.01.10):
Any time during the game you can restore your energy. Each level have it's own cheat sequence for that. Pause the game then enter one of the following codes according to the current game level to restore the energy.
A, A, A, A, B, B, B, B-1 level
A, B, A, A, B, A, B, B-2 level
A, B, Up, Up, A, B, Down, Down-3 level
Up, Down, Left, Right, A, B, A, B-4 level
A, Up, B, Down, A, Left, B, Right-5 level
Up, Down, Up, Up, Up, Up, Down, Up-6 level
Source: ReyVGM, Yakovlev Victor

(BUR) GameGenie:
ZEVEUSLE (for the Japanese version)
ZAUANNLE (for the US version)
-The Japanese version of this game have a disabled cheat test routine, means the both Sound and Obj Test modes were available and should've been enabled first, the same way as the Stage Select cheat. After enabling the Stage Select mode you need to hold B + Select, then press Start on controller 1 to access the Obj Test mode, and hold A + Select then press Start on controller 1 to access the Sound Test. The Game Genie code just replaces the Sound Test mode with the Obj Text mode. It is possible to reenable the cheat routine itself, but it need more GG codes, than this one. The US version have this cheat totally removed, so this GG code is only option to see the Obj Test mode.
XTKGETAV-Re-enables the development stage routine for both versions. To enable it you must enable the Stage Select code first, then during the game press Select to change the power mode, also you can see the CPU usage meter as gray line on the screen. Some unknown function can be enabled by press A on controller 2. Only visible effect for this is a unrevertable game pause.

Dragon Fighter (Flying Star, Unlicensed)

(UNI) Ending sequence (added 23.06.15):
At the title screen, hold Down + A + B on controller 2 and wait for a couple of seconds.

(BUR) Hidden text (added 23.06.15):
There are hidden copyrights inside the game:
Programming by Peter Lai , Hardware design by Tony Tseng .


Dragon Quest, Dragon Warrior

US version:

(BUR) Hidden text (added 24.06.09):
The SRAM initialization routine for this game uses string
KEN MASUTA
as SRAM signatures to check save banks integrity.

Dragon Quest II, Dragon Warrior II

All versions:

(UNI) Weird easter (added 26.03.14):
During the game, your position on the map should be $EB,$00 and $31 flag should be $00 (normally $01 on the world map, $40 in the dungeon, etc.) After a fight in this partucular location, when the reward is displayed, hold A on controller 2, then press A on controller 1. This will cause the message speed flag to be increased by 1 (var $62C, for fast is $28, normal $46 and for slow $FF). Only noticeable effect of this cheat would be different speed for different parts of the game, dialogs shoul be now slow speed, but fight message speed should be fast or normal if was slow.

Japanese version:

(GEN) Name easter:
In the Japanese version, the Prince and Princess' name are already predetermined. If you want to change them, just start a new game, type the Hero's name and before entering the last letter, hold Select + Start and enter the last letter. If done right, you'll be taken to a second name entry screen where you'll be able to name the Prince and then the Princess.
Source: ReyVGM

Dragon Quest III, Dragon Warrior III

All versions:

(UNI) Forbidden names (added 26.03.14):
There is a forbidden name for name entry screen for both regional versions of the game. In the Japanese version you couldn't enter a name "ろと". For the US version, forbidden name is "Erdrick" in any combination of letter cases.

(BUR) Hidden text (added 24.06.09):
SRAM initialization routine for this game uses string
MANABU YAMANA
as SRAM signatures to check save banks integrity.

US version:

(BUR) GameGenie (added 26.10.15):
AEENSNNY-Re-enables some debug leftovers. During the game hold B on controller 1 to move throught the walls and obstacles in both map and town modes. However, this doesn't disables the random encounters and game events, and you may get a glitch sometimes.

Japanese version PRG1:

(UNI) No random encounters (added 26.03.14):
This cheat was NOPed in PRG0 versions for all regions, but for some reason it was re-enabled in the PRG1 of the Japanese version. During the game, hold A on controller 2 while walking on the world map, the random encounter won't bother you anymore. Release this button to meet the enemy again.

Dragon Quest IV, Dragon Warrior IV

(BUR) Hidden text (added 24.06.09):
SRAM initialization routine for this game uses string
MANABU YAMANA
as SRAM signatures to check save banks integrity.

(GEN) View Poker Results:
Go to the casino, start a Poker game, hold B and press Select + Start.
Source: ReyVGM

Dragon Scroll - Yomigaerishi Maryuu

(GEN) Secret passwords (added 26.11.12):
かみなる めよりつ かわれし
ひかりの うろこも つものし
めいはた しこのち にねむる
-"Konami Shibun" a newspaper with some news about a "Chrome Dragon" (translated as "A message about divine shiny scales sleeping in the Tashiko lands").
こなみあ かまつみ しなまつ
おかいわ さやまし たすらた
かわにし こいけき のした
-Maximum exp, all items and weapons, last level access before last boss, invulnerability (translated as "Kamatsu Mishina, Matsuo Kaiwasa, Yamasita Suratawa, Nishiko Ikeki from Konami").

(UNI) A god's Narime promise (added 26.11.12):
After completing the game, people on the screen will throw a coffin and message "THE END" will slide right. After that, some people will start walking through the screen again. While they are walking, press Up + A + B on controller 2. A screen called "A GOD'S NARIME PROMISE" will appear. Here is some other cheats are available:
Press Down + A + B on controller 1-Return to the ending sequence with walking men and coffin, but this time all this will happen on the same "Narime" screen. You can return back to the normal "Narime" screen again with the same cheat as you did it before.
Press A + B + Select on controller 1-A message "あいことばは。。。。 ひみつが あるかも" will appear. From now, press A to return to the ending sequence starting from the dragon scene.
Press A 3 times, B 9 times, A 6 times and B 9 times on controller 1-A bottom message will disappear, now press A + Select. A message "きみの しあわせを しんじて" will appear. Press Select then message "ぼくは きみのますから さります" will appear. Finally, press Select to the final message "しあわせに まこ、、のぶちゃんより" and program will locked. You can't do anything any more here.

Dragon Slayer 4 - Drasle Family, Legacy of the Wizard

(FIX) Cheat mode:
All pressed buttons from both controllers in this game are combining to the one common button code, so it's doesn't matter which controller do you use. For example, the button A pressed on controller 1 is the same as being pressed on controller 2. This means that any button code combination can be pressed in many different ways, also it means, that you can press combinations, impossible to a single regular controller, like Left + Right combination. So, to enable cheat mode you must press Up + Down + Left + Right + A + B + Select at the title screen, combining the buttons from both controllers as you wish, then press Start. A sound will confirm correct code entry. Start a new game, then choose Raos (the boy on the left). Go to the store, stand before the Crystal and press A. You'll get a free Armour. Go back to the house and choose Raos again, but this time, wear the armour you just got for free. Leave the house and deplete your magic points completely. A sound will be heard again. Go back into the house, place the cursor on the grandfather painting on the wall and at the same time hold Left + Right + B also combining a buttons from two controllers as you wish, the cursor should stay in place. While holding, press A. If done right, a sound should be heard for the third time. Now you'll have max items and if you die, you'll come back to life, but maximum 4 times.

(UNI) Ending sequence (added 10.02.13):
To trigger this cheat you need a 4-player adaptor. With the same method as for previous cheat, you must press the button combination Left + Right + A at the title screen, but using the controllers 3 and 4. If done right, the title screen music will fade out and the staff roll begins.

Dragon Spirit - Aratanaru Densetsu, Dragon Spirit - The New Legend

All versions:

(GEN) Sound test:
Hold Up + A + B on controller 2 and press Reset. Use controller 1 to select various game sounds.

(FIX) Level select (added 02.01.08):
Enter "Sound test" cheat. Then, press Up, Up, B, Down, Down, B on controller 2. Use controller 2 to select a new starting level.

(FIX) Extra 20 dragons (added 02.01.08):
Skip first training game level. After some plot animation, when you return to the title screen with one of three dragons obtained, according to results of the first training stage, hold A + B on controller 2 then press Start on controller 1 to start a new game with extra 20 dragons.

Japanese version:

(GEN) Easter Egg (added 28.01.13):
Press Select 20 times at the good ending scene where Iris is riding on top of the Dragon's head to lift her skirt up.
Source: ReyVGM

Dragon's Lair

(GEN) Secret words:
Enter as player name for the hi-score table:
BATS-Thirty lives

Dragon, The

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

Dream Master

(UNI) Global skip (added 17.02.13):
Press A + B on controller 2 during the game to skip current cut scene or any other game's mode with no player involved. With this code, you can skip from the title screen just to the first dream intro and next to the game itself.

(BUR) GameGenie (added 17.02.13):
EAEGAAAE-Re-enables the global in-game pause. Hold Start to hold the game.
PAEGAAAA-Re-enables the global in-game debug. A couple of features now available.
Hold Start while walking to move through the obstacles and avoid the random encounters. But you still can enter the doors and climb on to ladders.
When starting a new game, enter any Prince name, then enter any 4-letter name of the Princess, but instead of pressing Start or selecthing the "END" option, press 5 times on any letter from 1 to 8 to start with the corresponding level including the Ending sequence.
During battle hold Select before attacking the enemy to deal 999 damage at once.
Press Start during cutscene to skip it.
GAEAIZEY-Re-enables the hidden unused main menu option with generic text entry screen with 8-letter string to enter. To enter it, select the "MESSAGE SPEED" from the main menu and press A or Start. It seems that this screen was used previously for the quick level access. To select a stage, you must enter correct sequence from the desired amount of letters. There are total 8 letters can be used: ユヒテラテホリス. The internal counter will be 3 if you enter only first three symbols, or 8 if you enter them all. Anyway, it seems that this option doesn't work properly now and leads to the same place with same glitches.

Dreamworld Pogie (Codemasters, Prototype)

(GEN) Suicide (added 24.09.14):
During the game, press Select.

(GEN) Soft reset (added 24.09.14):
During the game, press Select + Start.

(GEN) Free walk (added 24.09.14):
Press A + B on controller 2 during the game to skip current cut scene or any other game's mode with no player involved. With this code, you can skip from the title screen just to the first dream intro and next to the game itself.

(UNI) Extra 40 lives (added 24.09.14):
At the title screen, hold A, then press Start.

Drop Zone

(UNI) Secret words (added 22.02.17):
Play the game, score at least 10000pts to get to the name entry screen. Enter one of the names from the list below, then at the hi-score screen press Up, Right, Down, Left on controller 1. A small green enemy will appears as an animated cursor. This cursor will point only to secret names in the hi-score table. There may be more than one secret name entered previously. Choose any of it with Up/Down, then press Select. The effects cannot be combined, only one cheat at once.
ZOQ-Extra 10 bombs and Lives
NOJ-Extra 25 bombs and Lives
RRP-Doubles the cloak time
CZN-Start from WAVE 5
FHO-Start from WAVE 10
INR-Invulnerable to volcano particles and NMEYE enemy
KEN-Faster moving acceleration
LOB-Slower moving acceleration
BAZ-Higher gravity
WOW-Start from WAVE 75, Extra 25 bombs and Lives as well
MPS-Set the pinkish game palette and set the 10pts award for any destroyed object, even for those which has no award in the normal game.
HDB-Set all names to "JNR" and all scores to 100, so this will erase all previously entered secret names.

(BUR) Unused cheats (added 22.02.17):
The secret names mentioned above sets the values from $01 to $0C to specific RAM location to enable a corresponding effects. These are the only values the current code can set. But there are some other values, that game is checking, but never set. The value $14 is for infinite cloak, $15 for infinite lives and $16 for infinite bombs. You still can enable one of them by setting the corresponding value to the RAM location $142 during the game.

Duck Tales, Wanpaku Duck Yume Bouken

(UNI) Avoid falling from upper stages (added 29.03.14):
During the game, only bottom levels of the stage are deadly if you fall into the holes. When falling from the upper levels, you just moving to the lower ones. To avoid falling from the upper levels and loop back from the top of the screen, hold Up on controller 2 while falling.

Duck Tales 2

(BUR) Debug leftovers (added 29.03.14):
The RAM variable $D8 stands for the debug flag. Set it to the any non zero value to enable a couple of debug features: infinite HP, hold game any time by press Select on controller 1 or during the game press A or B on controller 2 to skip to the next or the previous level accordingly.

Dungeon & Magic - Swords of Element

(UNI) Extra 18 HP and 2nd level (added 04.01.08):
At the first scene of the opening sequence (threes) wait for text starts displaying then press A, A, A, A, A, A, A on controller 2 before text stop. You can wait for the next opening sequence scenes to enter other cheats, but can press Start on controller 1 and begin a new game.

(GEN) Extra 100 gold:
At the second scene of the opening sequence (village) before text starts displaying press A, A on controller 2. You can wait for the next opening sequence scenes to enter other cheats, but can press Start on controller 1 and begin a new game.

(UNI) Hidden level map (added 04.01.08):
At the third scene of the opening sequence (eye) before text starts displaying press A, A, A on controller 2. Then press Start on controller 1 and begin a new game. During the game you can press Up on controller 2 to view current level map.

(BUR) Ending sequence (added 04.01.08):
At the opening sequence press Left + Right on controller 2. Normally this is impossible and need modified controller.

Dusty Diamond's All-Star Softball, Softball Tengoku

(FIX) See the whole field (added 24.12.13):
At the title screen, on controller 2, hold Up and press A 6 times. Then hold Down and press B 4 times. Then on controller 1, press Select to enable cheat and then begin the game. While playing, anytime the field is in view, hold Start and use D-Pad to move the camera anywhere you want.
Source: ReyVGM

(UNI) Credits screen (added 21.01.15):
Beat the game, any time during final animation, on controller 2 hold Up, press A 3 times. Then hold Down and press B 6 times. Then press Select on controller 1.

Dynamite Bowl

(UNI) Ending sequence (added 23.07.13):
Hold Select on controller 1 just before the reset the console or before the title menu appears. Now at the title menu press A to increase internal counter to 1, press B to increase internal counter to 10. You need a number 31, so you can just press A 31 times, or B three times, then A one more time, or any other available sums. Press Start at the title screen to view the ending sequence.

(BUR) GameGenie (added 23.07.13):
GAOOVXGK-Switches the game into the strange kind of edit mode. You can move any of the ninepins on any position on the lane, and set any animation frame to it. You can't exit this mode or do something with resulting game field.

Dynowarz - Destruction of Spondylus

(FIX) Secret passwords:
0916-Level select
By pressing Up level increased, by pressing Down decreased.
For Level 2 press 5 times, 3 -> 9, 4 -> 13, 5 -> 17, 6 -> 21, 7 -> 29, values between means sublevels.
1965-Sound test
By pressing B selecting song, by pressing A play song.
7777-Enemy Viewer
Press Up or Down and you'll see the enemy on the right side of the title screen change. Press Start again to return to the title screen.
8708-Weapon select.
Additionally, in Man-Mode, pause the game and press Up for "Gun 1", press Up, Up for "Gun 2", in Dino-Mode, pause the game and press Down to select a weapon.
9425-Ending

 

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