Mostly Unpublished NES Cheats ;)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.

  '89 Dennou Kyuusei Uranai
  100 Man $ Kid - Maboroshi no Teiou Hen, Casino Kid
  8 Eyes
  AV Poker (Hacker), Peek-A-Boo Poker (Panesian)
  Abarenbou Tengu, Zombie Nation
  Action in New York, Final Mission, SCAT - Special Cybernetic Attack Team
  Adventures of Lolo 3 (US), Adventures of Lolo 2 (Japan)
  Ai Senshi Nicol (FDS)
  Aigiina no Yogen - From The Legend of Balubalouk
  Air Fortress
  Airwolf (Japan)
  Akumajou Densetsu, Castlevania III - Dracula's Curse
  Akumajou Special - Boku Dracula-kun
  Aladdin
  Alien 3
  Alien Syndrome
  Arabian Dream Scheherazade, Magic of Scheherazade, The
  Arkanoid
  Arkanoid 2
  Astyanax, Lord of King, The
  Attack Animal Gakuen
  Babel no Tou
  Back to the Future II & III
  Bad Dudes, Bad Dudes vs Dragon Ninja, Dragon Ninja
  Bakushou! Star Monomane Shitennou
  Banana Prince, Bananan Ouji no Daibouken
  Bao Xiao Tien Guo (Explosion Sangokushi, Waixing), Shang Gu Shen Jian (Henggedianzi)
  Bard's Tale, The - Tales of the Unknown
  Batman - Return of the Joker, Dynamite Batman
  Batman Returns
  Battle Baseball
  Battle Formula, Super Spy Hunter
  Battletoads
  Battletoads & Double Dragon - The Ultimate Team
  Best Keiba - Derby Stallion
  Binary Land
  Bio Miracle Bokutte Upa
  Bionic Commando, Hitler no Fukkatsu - Top Secret
  Black Bass 2, The, Black Bass USA, The
  Blue Marlin, The
  Bo Jackson Baseball
  Bonk's Adventure, FC Genjin - Freakthoropus Computerus
  Bucky O'Hare
  Burai Fighter
  Captain Planet and The Planeteers
  Captain Skyhawk
  Castle Excellent, Castlequest
  Challenger
  Championship Pool
  Chester Field - Ankoku Shin heno Chousen
  Chip's Challenge (Prototype)
  Choujin Sentai - Jetman
  Chuugoku Janshi Story - Tonpuu
  Chuugoku Senseijutsu
  Conquest of the Crystal Palace, Matendouji
  Contra, Probotector, Contra 1993, Super Contra II
  Cosmic Epsilon
  Crackout
  Crisis Force
  Crystal Mines
  Daisenryaku
  Datach - Ultraman Club - Supokon Fight!
  Datach - Yuu Yuu Hakusho - Bakutou Ankoku Bujutsu Kai
  Datsugoku, POW - Prisoners of War
  Deep Dungeon 4 - Kuro no Youjutsushi
  Demon Sword, Fudou Myouou Den
  Derby Stallion - Zenkoku Han
  Destiny of an Emperor, Tenchi wo Kurau
  Dezaemon
  Dig Dug II
  Digger - The Legend of the Lost City, Digger T. Rock - The Legend of the Lost City
  Digital Devil Monogatari - Megami Tensei II
  Don Doko Don
  Doraemon
  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, Dragon Ball - Shen Long no Nazo, Dragon Power
  Dragon Buster
  Dragon Fighter (Sofel)
  Dragon Quest II, Dragon Warrior II
  Dragon Quest IV, Dragon Warrior IV
  Dragon Scroll - Yomigaerishi Maryuu
  Dragon Spirit - Aratanaru Densetsu, Dragon Spirit - The New Legend
  Dragon's Lair
  Dreamworld Pogie (Codemasters, Prototype)
  Dungeon & Magic - Swords of Element
  Eggland - Meikyuu no Fukkatsu
  Egypt
  Erika to Satoru no Yume Bouken
  Exodus
  Famicom Shougi - Ryuuousen
  Famicom Top Management
  Family BASIC, Playbox BASIC
  Famista '90
  Famista '91
  Fighting Golf, Lee Trevino's Fighting Golf
  Final Fantasy
  Fire 'n Ice, Solomon no Kagi 2 - Coolmin Tou Kyuushutsu Sakusen, Solomon's Key 2
  Fire Emblem Gaiden
  Fire Hawk
  Flappy
  Flintstones, The - The Surprise at Dinosaur Peak!
  Flying Warriors, Hiryuu no Ken II - Dragon no Tsubasa
  Freedom Force
  Fuzzical Fighter
  Galaxy 5000
  Gambler Jiko Chuushin Ha 2
  Ganbare Goemon! - Karakuri Douchuu
  Ganso Saiyuuki - Super Monkey Daibouken
  Gauntlet
  Gekitou Pro Wrestling!! - Toukon Densetsu, Tecmo World Wrestling
  Genpei Touma Den - Computer Boardgame
  Ghosts'n Goblins, Makai-Mura
  Gimmi a Break - Shijou Saikyou no Quiz Ou Ketteisen
  Gimmick!, Mr. Gimmick
  Golgo 13 - Dai 1 Shou - Kamigami no Tasogare, Golgo 13 - Top Secret Episode
  Goonies, The
  Gozonji - Yaji Kita Chin Douchuu
  Gradius
  Gradius II
  Gremlin 2 - Shinshu Tanjou, Gremlins 2 - The New Batch
  Guerilla War, Guevara
  Guardian Legend, The, Guardic Gaiden
  Gun Nac
  Gyrodine
  Gyruss
  Happy Camper
  Higemaru Makaijima - Nanatsu no Shima Daibouken, Makai Island
  Hiryuu no Ken III - 5 Nin no Ryuu Senshi
  Hissatsu Doujou Yaburi
  Hissatsu Shigoto Nin
  Hokkaidou Rensa Satsujin - Ohotsuku ni Kiyu
  Home Alone
  Hudson's Adventure Island, Takahashi Meijin no Bouken Shima
  Hudson's Adventure Island II, Takahashi Meijin no Bouken Shima II
  Hudson's Adventure Island III, Takahashi Meijin no Bouken Shima III
  Hunt for Red October, The
  Hyokkori Hyoutan Shima - Nazo no Kaizokusen
  Ikari, Ikari Warriors
  Ikinari Musician
  Isaki Shuugorou no Keiba Hisshou Gaku
  Itadaki Street - Watashi no Mise ni Yottette
  JJ - Tobidase Daisakusen Part 2, 3-D Battles of World Runner, The
  Jajamaru Gekimaden - Maboroshi no Kinmajou
  Jigoku Gokuraku Maru, Kabuki - Quantum Fighter
  Jongbou
  Journey to Silius, Raf World
  Joy Mech Fight
  Jungle Book, The
  Kagerou Densetsu
  Kaiketsu Yanchamaru 3 - Taiketsu! Zouringen
  Karnov
  Kickle Cubicle, Meikyuu Shima
  Kid Klown, Mickey Mouse 3 - Yume Fuusen, Mickey Mouse - Dream Balloon (Prototype)
  King Kong 2 - Ikari no Megaton Punch
  Klash Ball
  Krazy Kreatures
  Kunio-kun no Nekketsu Soccer League
  Kurogane Hiroshi no Yosou Daisuki! - Kachiuma Densetsu
  Kyonshiizu 2
  Kyuukyoku Harikiri Stadium 3
  Kyuukyoku Tiger, Twin Cobra
  Legend of Zelda, The, Zelda no Densetsu 1 - The Hyrule Fantasy
  Les Chevaliers Du Zodiaque - La Legende D'or, Saint Seiya - Ougon Densetsu
  Lion King, The
  Little Nemo - The Dream Master, Nemo - Pajama Hero
  Locksmith
  Lone Ranger, The
  Magic John, Totally Rad
  Mahjong Taisen
  Majaventure - Mahjong Senki
  Mario Open Golf, NES Open Tournament Golf
  Matsumoto Tooru no Kabushiki Hisshou Gaku 2
  Meitantei Holmes - Kiri no London Satsujin Jiken
  Meitantei Holmes - M Kara no Chousenjou
  Mendel Palace, Quinty
  Metal Fighter, Mei Loi Siu Ji (Sachen / Kinema Music / Color Dreams), Wei Lai Xiao Zi (Joy Van)
  Metroid
  Mickey Mouse, Mickey Mousecapade
  Moai-kun
  Momotarou Densetsu Gaiden
  Momotarou Dentetsu
  Money Game, The
  Monster Party
  Ms. Pac-Man (Tengen)
  Nekketsu Kakutou Densetsu
  Nekketsu Kouha - Kunio-kun, Renegade
  New Ghostbusters II
  New York Nyankies, Rockin' Kats
  Ninja Gaiden 2 - The Dark Sword of Chaos, Ninja Ryukenden II - Ankoku no Jashin Ken, Shadow Warriors Episode II - The Dark Sword of Chaos
  Ninja Gaiden 3 - The Ancient Ship of Doom, Ninja Ryukenden III - Yomi no Hakobune
  Nobunaga no Yabou - Sengoku Gunyuu Den, Nobunaga's Ambition 2
  Orb 3D
  Over Horizon
  Overlord
  Palamedes
  Pin Bot
  Pocket Monster (Early Super Game), Panda World, Super PoPo's Adventure
  Predator
  Pro Yakyuu - Family Stadium '88
  Probotector II - Return of the Evil Forces, Super C, Super Contra
  Punisher, The
  Puyo Puyo
  Puzslot
  Q Boy (Sachen)
  Quattro Adventure (Codemasters)
  R.B.I. Baseball 2
  R.B.I. Baseball 3
  R.C. Pro-Am 2
  Rad Racer 2
  Radia Senki - Reimei Hen
  Raid on Bungeling Bay
  Remote Control
  Robin Hood - Prince of Thieves
  Robocop
  Romancia
  Scarabeus (Prototype)
  Saiyuuki World 2 - Tenjoukai no Majin, Whomp'Em
  Sangokushi II - Haou no Tairiku
  Sanrio Carnival
  Secret Ties (Prototype)
  Seicross
  Seikima II - Akuma no Gyakushuu
  Shanghai
  Shatterhand, Tokkyuu Shirei - Solbrain
  Shin 4 Nin Uchi Mahjong - Yakuman Tengoku
  Shingen The Ruler, Takeda Shingen 2
  Shinobi (Tengen)
  Simpsons, The - Bart Vs. the Space Mutants
  Skate or Die 2 - The Search for Double Trouble
  Sky Destroyer
  Solomon no Kagi, Solomon's Key
  Son Son
  Space Harrier
  Spot
  Square no Tom Sawyer
  Star Soldier, Star Soldier Special Version
  Star Trek - The Next Generation
  Star Wars (Namco)
  Star Wars - The Empire Strikes Back
  Street Fighter III
  Summer Carnival '92 - Recca
  Sunman (Prototype)
  Super Contra 7
  Super Dyna'mix Badminton
  Super Mario Bros., All Night Nippon Super Mario Bros., VS Super Mario Bros.
  Super Mario Bros. 2, Super Mario USA
  Sword Master
  Taito Chase H.Q.
  Taiyou no Shinden - Asteka 2, Tombs and Treasure
  Takeshi no Chousenjou
  Tatakai no Banka, Trojan
  Tecmo Super Bowl
  Teenage Mutant Ninja Turtles II - The Arcade Game, Teenage Mutant Hero Turtles II - The Arcade Game, Teenage Mutant Ninja Turtles (Japan)
  Teenage Mutant Ninja Turtles III - The Manhattan Project, Teenage Mutant Ninja Turtles 2 - The Manhattan Project (Japan)
  Tetris (Nintendo)
  Tetris (Tengen)
  Tetris 2 + Bombliss
  Thexder
  Thunderbirds
  Thundercade
  Tiger-Heli
  Tiny Toon Adventures
  Titan
  TM Network - Live in Power Bowl
  Toki no Tabibito
  Tom & Jerry and Tuffy
  Top Gun - Dual Fighters, Top Gun - The Second Mission
  Touhou Kenbun Roku
  Tower of Druaga, The
  Treasure Master
  Ultraman Club - Kaijuu Dai Kessen!!
  Utsurun Desu
  Valis - The Fantastic Soldier
  Wagyan Land
  Wario no Mori, Wario's Woods
  Win, Lose or Draw
  Wing of Madoola, The
  Woody Poko
  Wrecking Crew
  Yoshi no Cookie, Yoshi's Cookie
  Youkai Club
  Zanac
  Zelda II - The Adventure of Link

Summary:
generic cheats-382
total games-286

'89 Dennou Kyuusei Uranai

(GEN) Secret message:
At the title screen, press A + B to view hidden credits.
Source: ReyVGM

100 Man $ Kid - Maboroshi no Teiou Hen, Casino Kid

US version:

(GEN) Continue:
At the game over screen, hold Up then press Start.
Source: ReyVGM

8 Eyes

Japanese version:

(GEN) Sound test:
Pause the game, and you can use controller 2 to scroll through the tracks with Left or Right and play a track with A. This cheat actually should've been enabled by the button code during pause A + B on controller 1 and A + B on controller 2 at the same time, but by accident, the cheat enable flag was overwritten with some system variable and in this particular place always non zero, so this cheat is always enabled automatically, when you enter the pause mode. In the US version this cheat was removed completely.
Source: ReyVGM

US version:

(GEN) Secret passwords:
TAXANTAXAN-Special stage
FINALSTAGE-Final stage

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.

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.

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

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

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.

Ai Senshi Nicol (FDS)

(GEN) Stage select:
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:
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

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)

(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.

Akumajou Densetsu, Castlevania III - Dracula's Curse

(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

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!".

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.

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.

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.

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

Arkanoid

(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

Astyanax, Lord of King, The

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

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.

Babel no Tou

(GEN) Babel pro:
At the title screen, press Up, Up, Up, Down, Down, Down, Down, Down, Right, Right, Left.

Back to the Future II & III

(GEN) Start at 1875 (Part 3):
At the title screen, hold B then press Select to display the password menu. Enter "FLUXCAPACITORISTHEPOWER" as a password.

Bad Dudes, Bad Dudes vs Dragon Ninja, Dragon Ninja

US version:

(GEN) Sound test:
After beating game, when last credit's message "data east usa corp." rolls out, American flag at the White House stops flutter. Then press Right, Left, Down, Up, A, A, B on controller 2 to make it flatter again. Press A to hear a music, press any other button then A or Start to return to the main menu.

Japanese version:

(GEN) Sound test:
After beating game, when last credit's message "data east usa corp." rolls out, American flag at the White House stops flutter. Then press Right, Left, Down, Up, B, B, A on controller 2 to make it flatter again. Press A to hear a music, press any other button then A or Start to return to the main menu.
Source: ReyVGM

Bakushou! Star Monomane Shitennou

(GEN) Instant win:
Any time during the game hold Select on controller 1 then press Start.
Source: ReyVGM

Banana Prince, Bananan Ouji no Daibouken

(GEN) Secret ability:
While playing, hold Down + B for 3 seconds and then immediately press Up + B.
Source: ReyVGM

Bao Xiao Tien Guo (Explosion Sangokushi, Waixing), Shang Gu Shen Jian (Henggedianzi)

(GEN) Chapter skip:
During the game, press A + B + Start to immediately complete current chapter.

Bard's Tale, The - Tales of the Unknown

Japanese version:

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

Batman - Return of the Joker, Dynamite Batman

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

Batman Returns

(GEN) Ending easter 2:
After the ending sequence is over and copyright message appears, press either A or B on controller 1 to animate the penguin.

Battle Baseball

(GEN) The Final Team:
At the game menu, select the top option, then select the 1st or 3rd option. Pick your team and play a game (or let the computer play them, it's way faster). After finishing a game, you'll see a news anchor giving the results of the games. On the very last message he gives, press A + B on controller 2 until the Hero All Stars Team challenges you.
Source: ReyVGM

(GEN) The Same Team:
At the menu screen, choose the lower left option, then Vs Game. Now, while choosing your team, hold Select + Start on controller 1 and you'll be able to chose the same team as your opponent.
Source: ReyVGM

Battle Formula, Super Spy Hunter

(GEN) Hyper tennis:
After the game over screen, put cursor to the CONTINUE option, then press A 8 times to put turrets on it straight down and then press Start. You may play with second player or with CPU. Defeat CPU to continue game play with 20 extra lives.

Battletoads

(GEN) Extra 5 lives:
Hold Down + A + B and press Start at the title screen or continue screen on any controller (both players can get the extra lives). An explosion will confirm correct code entry.

Battletoads & Double Dragon - The Ultimate Team

(GEN) Super Warp zone Extra 10 Lives:
Press Down, Up, Up, Down, A, B, B, A at the player selection screen. A sound will confirm correct code entry. Press Start to enter Level selection menu up to 7-1 level and you'll start with extra 10 lives.

Best Keiba - Derby Stallion

(GEN) Sound and CHR test:
At the title screen, hold Right on controller 2 and press Start on controller 1.
Source: ReyVGM

Binary Land

(GEN) Hi-score record:
If your score is higher than 30000 pts, press Select after you die - you will be able to enter your name on the list of the best scores.

(GEN) Love story:
Hold on both controller 1 and controller 2 at the same time A + B, then press Reset to switch game to "Love story" mode. Title screen changed to "KIKU. MEGU. LOVE STORY" and when one of penguins will be hit by enemy it will be crying name of another penguin. "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.

Bio Miracle Bokutte Upa

(GEN) Level select:
At the title screen, hold Up + A on controller 1 and Down + B on controller 2 at the same time. Now press Select on controller 1, then release all buttons.

Bionic Commando, Hitler no Fukkatsu - Top Secret

(GEN) Level exit:
During regular "left-to-right" levels, hold A + B then press Start. This won't work for the "bottom-to-top" levels.

Black Bass 2, The, Black Bass USA, The

US version:

(GEN) Secret words:
HBMAX-Attractive Bait Meter

Blue Marlin, The

(GEN) Sound test:
Hold Select + Start then press Reset.

Bo Jackson Baseball

(GEN) All-Bo Jackson team:
Select any team, select a CPU opponent and press A, then press Left + B + Select at the team roster screen. Bo Jackson will appear in every position on the roster.

(GEN) Get Bo Jackson:
Select Chicago as a team, select a CPU opponent and press A, then press Up + Select at the team roster screen to place Bo Jackson as your central fielder.

Bonk's Adventure, FC Genjin - Freakthoropus Computerus

(GEN) Level select and Sound test:
Hold Down + Left + A + B + Select + Start at the title screen. Switch between Level select and Sound test by pressing Select.

Bucky O'Hare

All versions:

(GEN) Secret passwords:
HARD!-Hard mode

Burai Fighter

(GEN) Secret passwords:
LOBB-All weapons
KAGA-99 lives

Captain Planet and The Planeteers

(GEN) Secret passwords:
506210-Ending sequence, unlockable after beating the game.

Captain Skyhawk

(GEN) Invulnerability:
Press Up, Right, Down, Left, Up at the copyright screen, background will flash.

Castle Excellent, Castlequest

(GEN) Sub command:
During the game press A or B on controller 2.

Challenger

(GEN) Love story:
When in SCENE 2 press on controller 1 A, B, A, A, B, B, A, A, A, B, A, A, B, B, B, B, A, B, A, B, A, B, B, A, A, B, A, A, A, B, A, B. You will see the message "KIKU MEGU LOVE STORY!" immediately. Note: if you write code sequence as 0 and 1 string "0100 1100 0100 1111 0101 0110 0100 0101" it will give you "4C 4F 56 45" hex string, in ASCII this mean "LOVE". Another interesting thing, that is the same message appears in "Binary Land" game for Famicom by HUDSON. "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.

Championship Pool

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

Chester Field - Ankoku Shin heno Chousen

Final version:

(GEN) Invincibility:
During the game press Select to enter the game menu, press A + B on controller 2 to enable cheat input, now press A, Right, Left, Up, Right, Left, Down, Up, Right, Down.

(GEN) Suicide:
During the game, press Down + A + B on controller 2.

Chip's Challenge (Prototype)

(GEN) Level selecl:
At the start of the level, before pressing any button, press A or B on controller 1 to skip to the next or the previous levels accordingly.

Choujin Sentai - Jetman

(GEN) Extra difficulty settings:
Hold A + B then press Start at the opening screen to unlock the hard and very hard difficulty modes. This is unlockable cheat, you can obtain it if beat the game once.

(GEN) Soft reset:
During the game press A + B + Select + Start once.
Source: ReyVGM

Chuugoku Janshi Story - Tonpuu

(GEN) Music test:
At the title screen, press Left, Left, Left, Right, Right, Right, Start.
Source: ReyVGM

Chuugoku Senseijutsu

(GEN) Auto fill names list:
While on the Name List menu, hold Left and press B on the number 1 and number 6 to automatically fill the names list.
Source: ReyVGM

Conquest of the Crystal Palace, Matendouji

All versions:

(GEN) Sound test:
At the title screen, hold A + B + Select for a while. Use the D-Pad to select a song and press A to play the current selection.

(GEN) Cheat mode:
At the title screen, hold B + Select for a while, release the buttons then press A + Select a couple of times (not holding it), until a sound will confirm correct code entry. Actually, you just need to press both combination once, but program skip the code test every 8 frames, so you can just miss if press exactly at that time. Begin game play, hold Select and enter one of the following codes to activate the corresponding cheat function.
Right-Temporary invulnerability
Left-Extra gold
Up-Jumping Shoes
Down-Full life
Up + Right-Extra lives (up to 99)
Down + Left-Power-up weapon
Up + Left-Moon Mirror
Down + Right-Zap energy

Japanese version:

(GEN) Extra credits:
At the title screen, hold B + Select for a while, then press A + B to increase starting credits number.
Source: ReyVGM

Contra, Probotector, Contra 1993, Super Contra II

All versions:

(GEN) Extra 30 lives:
At the title screen, before demonstration begins, press Up, Up, Down, Down, Left, Right, Left, Right, B, A. The buttons Start and Select not counting when entering cheat, so you can press it any time, but after pressing Start game begins and entered button sequence is checked.

Japanese version:

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

(GEN) Secret message:
After beating the game, just before the staff roll, on the island explosion animation, hold Select + Start on controller 1 and keep holding it before the game should return back to the map and start a game from the beginning. Instead of map, you'll see a secret message about "Red Falcon".

Cosmic Epsilon

(GEN) Continue:
At the game over screen, hold Select and press Start. Then, press Start at the title screen.

(GEN) Secret message:
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A. Message "I AM NOT KONANI" will appear. Similar code used in most of Konami games and accordingly called "Konami code" sometimes. If you try to enter is in "Cosmic Epsilon", then you will be informed about wrong game developer. ;)

(GEN) Level select:
At the title screen, press A, B, Right, Left, Right, Left, Down, Down, Up, Up after the introduction sequence ends and the logo appears. This is exactly "Konami code" backwards. ;)

(GEN) Another world mode:
At the title screen, press Up, Down, Left, Right, A, Down, Up, Left, Right, B after the introduction sequence ends and the logo appears. The phrase "Another World!" will appear at the bottom of the screen to confirm correct code entry. The game is more difficult in this mode. This chieat is unlockable when beating the game once, after the final staff roll, just wait for it at the Asmik logo.

Crackout

(GEN) Secret words:
Enter into the computer at the end of the game:
MERRY CHRISTMAS-Ending of the game

Crisis Force

(GEN) Extra 15 Ships:
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start.

Crystal Mines

(GEN) Level select:
At the stage number screen, press A or B to increase or decrease starting level number by 5, up to 81.

(GEN) Suicide:
During the game, press Select + Start to commit suicide.

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

Datach - Ultraman Club - Supokon Fight!

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

Datach - Yuu Yuu Hakusho - Bakutou Ankoku Bujutsu Kai

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

Datsugoku, POW - Prisoners of War

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

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

Demon Sword, Fudou Myouou Den

US version:

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

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

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

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.

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 II

(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

Don Doko Don

(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.

Doraemon

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

(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.

(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.

Downtown - Nekketsu Monogatari, River City Ransom, Street Gangs

English versions:

(GEN) Easter egg:
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:
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!

(GEN) Secret words:
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:
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, 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 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.

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.

Dragon Quest II, Dragon Warrior II

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 IV, Dragon Warrior IV

(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:
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").

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.

Japanese version:

(GEN) Easter Egg:
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

Dreamworld Pogie (Codemasters, Prototype)

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

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

(GEN) Free walk:
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.

Dungeon & Magic - Swords of Element

(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.

Eggland - Meikyuu no Fukkatsu

(GEN) Secret passwords:
きいそうさすきなとこいくきのうみせなさい-Stage select. During the game, press B to see the map of the levels, hold Select then use the D-Pad buttons to navigate, press B to move to the selected level.
かなさしはにはたしてせいさつにつかもつた-Final battle.

Egypt

(GEN) Alternative credits:
To see an alternative credits screen, hold Up + A + B right before the credits roll.
Source: ReyVGM

(GEN) Sound and CHR test:
Hold Right + B then press Reset. This cheat will be revealed after beating the game on the Normal difficulty.

Erika to Satoru no Yume Bouken

(GEN) Secret message:
Beat the game. The last screen on the ending is a photo of the characters with the word おしまい (END).
Let the screen sit for 18 minutes. The photo goes black-and-white.
Let the screen sit for 18 more minutes. The photo goes sepia-tone.
Wait 55 minutes. When the music stops suddenly, press Left + A + B + Select + Start on controller 1, and Right + A + B on controller 2. A new music will start.
Press Right + B + Select on controller 1, and Down + Right + B on controller 2. Hidemushi's message will start.
Once Hidemushi's message stops, press Up + A + B on controller 1 for his last message.
Wait 18 more minutes, and the game goes back to the title screen.

(GEN) Secret passwords:
みのりくみこきよはる-Secret message 1
おみやきていしよくさ-Secret message 2
ままかいしやこわいよ-Secret message 3
こいするおおまちくん-Secret message 4
Source: tcrf.net

Exodus

(GEN) Level select:
At the stage number screen, press A or B to increase or decrease starting level number by 5, up to 81.

(GEN) Suicide:
During the game, press Select + Start to commit suicide.

Famicom Shougi - Ryuuousen

(GEN) Save and Load menu:
Select first or second game modes at the title menu, then press B + Start on controller 1 to enter the Save/Load menu.

Famicom Top Management

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

Family BASIC, Playbox BASIC

(GEN) Secret words:
Enter following commands to see a hidden built-in games.
GAME 1-Unfinished game 1
GAME 2-Unfinished game 2
GAME 2,1-Complete finished game 1 + 2 Mario type
GAME 3-Complete finished game Shooter type

Famista '90

(GEN) Test mode:
At the title screen after "push start button" message appears hold A + B on controller 1 then press Start.

Famista '91

(GEN) Test menu:
At the first title screen, before "push start button" message appears on controller 1 press B 9 times and A 1 time (in any order), then press Start.

Fighting Golf, Lee Trevino's Fighting Golf

(GEN) Left-handed play:
While selecting a player, hold Left.

Final Fantasy

(GEN) Bonus puzzle game:
Enter the ship, hold A and press B 55 time. Arrange the tiles in order from 1 to 15 to collect 100 Gold.

(GEN) Display map:
During the game, holp B, then press Select. Instead of the Lineup edit mode, a map will appear.

Fire 'n Ice, Solomon no Kagi 2 - Coolmin Tou Kyuushutsu Sakusen, Solomon's Key 2

All versions:

(GEN) Extra levels, Sound test:
Hold Select and press B, B, B, B, B, B, B, B, B, B at the title screen. Extra 5 Worlds (50 new levels) all along with sound test options will be available.

Fire Emblem Gaiden

(GEN) Easy mode:
Hold Select + Start and select the "New Game" option. Additional menu will appears.

Fire Hawk

(GEN) Mission 2:
At the title screen, hold A and press Start.

Flappy

(GEN) Suicide:
During the game, press Select + Start to commit suicide.

Flintstones, The - The Surprise at Dinosaur Peak!

(GEN) Debug mode:
Press A, B, Right, A, Down, Down, Down, Down, B, Left, Left, B, A, Start at the title screen. This "Debug mode" identical to the one from the "The Rescue of Dino & Hoppy", except there is no Frame advance feature anymore. But additionally an instant game over is added if you press Down on controller 2.

Flying Warriors, Hiryuu no Ken II - Dragon no Tsubasa

Japanese version:

(GEN) Secret passwords:
おんがく-Sound test
さいご-Ending
Source: ReyVGM

Freedom Force

(GEN) Unlockable:
After completing all levels, a message with some secret words will appear. Secret words are: "SPYHUNTER", "XENOPHOBE", "PLATOON". All these are other SunSoft titles, but meaning of these words is unknown, except they are all other SunSoft titles.

Fuzzical Fighter

(GEN) Palette editor:
While playing on Ship mode, press Up on controller 2 to pause the game and then press A, B, Up, Down on controller 1. If done right, a bunch of numbers will appear. Use these numbers to change the colors of the game. For some unknown reason, this was a leftover from the development stage didn't disabled in the final release. Actually this secret code was intended for the cheat described below.
Source: ReyVGM

Galaxy 5000

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

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

Gambler Jiko Chuushin Ha 2

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

Ganbare Goemon! - Karakuri Douchuu

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

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

Ganso Saiyuuki - Super Monkey Daibouken

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

Gauntlet

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

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

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

Genpei Touma Den - Computer Boardgame

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

Ghosts'n Goblins, Makai-Mura

Japanese version:

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

Gimmi a Break - Shijou Saikyou no Quiz Ou Ketteisen

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

Gimmick!, Mr. Gimmick

All versions:

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

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

All versions:

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

Goonies, The

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

Gozonji - Yaji Kita Chin Douchuu

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

Gradius

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

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

Gradius II

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

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

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

Japanese version:

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

Guerilla War, Guevara

All versions:

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

Guardian Legend, The, Guardic Gaiden

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

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

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

Gun Nac

All versions:

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

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

Gyrodine

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

Gyruss

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

Happy Camper

(GEN) Level select:
Anytime during the game, hold B and press Select. It will warp you to a new area in the game. Some of these areas are unplayable, but you can keep doing this trick until you get to an area that is playable.

Higemaru Makaijima - Nanatsu no Shima Daibouken, Makai Island

(GEN) Continue:
After game over, at the title screen hold Up then press Start on controller 1 to start a new game.
Source: ReyVGM

Hiryuu no Ken III - 5 Nin no Ryuu Senshi

(GEN) Critical Hit:
At the last boss, hold Select + Start and choose attack. You'll deal a 250+ hit damage every time.
Source: ReyVGM

(GEN) Different Characters:
At any of the "Chapter # Push Start" screens, press Select 10 times and you'll be able to choose between any of the 5 characters.
Source: ReyVGM

(GEN) Skip Cutscenes:
While in a cutscene, hold Select + Start and press A.
Source: ReyVGM

(GEN) Secret passwords:
おしまい-Ending
おときく-Sound Test
Source: ReyVGM

Hissatsu Doujou Yaburi

(GEN) Sound test:
At the title screen, press A + B and the cursor will disappear. Now, use B to cycle through the sounds and A to cycle through the music.
Source: ReyVGM

Hissatsu Shigoto Nin

(GEN) Ending sequence:
At the title screen, before selecting the new game or continue, press Left 19 times. Now, start a new game, after starting movie sequence ending credits will follow.
Source: ReyVGM

Hokkaidou Rensa Satsujin - Ohotsuku ni Kiyu

(GEN) Continue:
After receiving the password, you'll get a screen that says "To Be Continued", to avoid having to reset the game to get out of it, just hold A + Select on controller 1 and press Up on controller 2.
Source: ReyVGM

(GEN) End The Card Game:
Whenever you are in a Blackjack match, hold B on controller 2 before dealing the cards to end the game after one match.
Source: ReyVGM

Home Alone

(GEN) Secret message:
At the copyright text screen press on controller 1 or controller 2 Up + Left + A + B + Select once then Down + Right + A + B + Start, "HOME ALONE EXTRA SPECIAL" screen will appears. This extra copyright screen available in all Bethesda's games with the same code.

Hudson's Adventure Island, Takahashi Meijin no Bouken Shima

(GEN) Continue:
First, collect the Hudson's bee at the end of level 1-1 inside the hidden egg. Now, at any Game Over or at the title screen, hold any D-Pad button before press Start to continue from the last played leve.

Hudson's Adventure Island II, Takahashi Meijin no Bouken Shima II

(GEN) Level select:
At the title screen, wait until Higgins is hit by the coconut, then press Right, Left, Right, Left, A, B, A, B.

(GEN) Continue with all items:
Collect the Hudson's bee in one of hidden eggs during the game and you'll be able to keep all items while continuing. Just hold one of the D-Pad buttons, then use the "CONTINUE" option at the title screen.

Hudson's Adventure Island III, Takahashi Meijin no Bouken Shima III

(GEN) Level select:
At the title screen, press Down, Up, Left, Right, B, A, B, A.

Hunt for Red October, The

(GEN) Double points:
Pause the game, press A, B, B, A, Right, Down, Up, Left, Left. The bottom of the screen will turn green. This code can only be used once per game.

(GEN) Level skip:
Pause the game, press A, B, Select, Right, Left, Left, Right, Select, B, A, B, B, A. The level skips immediately. This code can only be used once per game.

(GEN) Instant stop:
Pause the game, press Up, Down, Left, Right, Select. The bottom of the screen will turn green. This cheat triggers on/off each time you enter it.

(GEN) Slow automatic scrolling:
Pause the game, press Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, A, B, B, A. The bottom of the screen will turn green. This cheat triggers on/off each time you enter it.

(GEN) Disable automatic scrolling:
Pause the game, press Up, Up, Down, Down, Left, Left, Right, Right. The bottom of the screen will turn green. This cheat triggers on/off each time you enter it.

Hyokkori Hyoutan Shima - Nazo no Kaizokusen

(GEN) Level skip:
During the game, in the puzzle/action levels, press Up + B on controller 2 to complete the current level instantly.
Source: ReyVGM

Ikari, Ikari Warriors

(GEN) Continue:
At the game over screen, press A, B, B, A. This also can be done on controller 2 at any time for a second player to enter the game.

Ikinari Musician

(GEN) Chose color scheme:
At the title screen, press A, A, B, B, Right, Left, Select. If done right, the word "BOY" will appear on the top left of the screen. This word represent the current color scheme, now you can select three more color schemes for the game: "GIRL", "OLD" and "B/W TV".
Source: ReyVGM

Isaki Shuugorou no Keiba Hisshou Gaku

(GEN) Sound test:
Hold A + B on controller 2 and press Start on controller 1.
Source: ReyVGM

Itadaki Street - Watashi no Mise ni Yottette

(GEN) Turbo file operations:
At the title screen hold A then press Start. You will be able to manage Turbo File devise to save and load progress.

JJ - Tobidase Daisakusen Part 2, 3-D Battles of World Runner, The

All versions:

(GEN) Continue:
After your game has ended, push Up + A or Down + A.

(GEN) Hard mode:
At the title screen, press Start, then when the "PRESS START TO BEGIN" message is displaying, press B, B, B, B then hold Up + Left and press Start on controller 1. In this mode, all enemies are movig faster. This cheat is unlockable, and revealed if you beat the game once.

Jajamaru Gekimaden - Maboroshi no Kinmajou

(GEN) Refill HP:
At the very end of the game, enter the village by the sea (use the secret name trick to reach the final boss, loose and you'll appear at exactly needed village), reach the 4th screen of the town and enter the lower-left house (it should be empty). Once inside, press A, Up, Up, Down, Right, B, Down, Left, Right, Left on controller 2. Leave the house and come back in again. If done right, there will be a couple of kids ready to refill your HP.
Source: ReyVGM

(GEN) Refill MP:
At the very end of the game, enter the village by the sea (use the secret name trick to reach the final boss, loose and you'll appear at exactly needed village), reach the 4th screen of the town and enter the lower-left house (it should be empty). Once inside, press Down, Down, Up, Up, Right, Left, A, Right, B, Left on controller 2. Leave the house and come back in again. If done right, there will be a bird ready to refill your MP.
Source: ReyVGM

Jigoku Gokuraku Maru, Kabuki - Quantum Fighter

All versions:

(GEN) Sound test:
Complete the game, then after the Credits have rolled, hit B.

(GEN) Chip swap:
During boss fight, press Start to pause the game, then press Up or Down to convert your chips into HP or HP into chips accordingly.

Jongbou

(GEN) Continue:
At the title screen after the game over, press Down, Up, Left, Right, Start.
Source: ReyVGM

Journey to Silius, Raf World

(GEN) Sound test and Extra 9 continue:
Press B 33 times then Start at the title screen. A sound test option will be available. Additionally, nine continues will be available when game play begins.

Joy Mech Fight

(GEN) Secret fighters:
Select any game mode at the main game menu, except "1P Quest", and press A + B + Select + Start at the same time.

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

Jungle Book, The

(GEN) Cheat mode:
At the options screen, in the sound test option, play songs in following order: 40, 30, 20, 19, 18, 17, 16, 15.

Kagerou Densetsu

(GEN) No random encounters:
Hold B on controller 2, while walking on the world map.
Source: ReyVGM

(GEN) Trigger Fights:
To manually trigger fights while on the world map, press:
A + Start-The enemy will be moving
A + Select-The enemy will be standing still
Source: ReyVGM

(GEN) Fight the bosses:
While on the world map, hold the following buttons on controller 2 and press Start (enemy will be moving) or Select (enemy will be standing still) on controller 1 to start the fight.
B-Earth Boss
Right-Fire Boss
A-Water Boss
A + B-Wild Boss
Source: ReyVGM

(GEN) Revive a character:
Open the menu on the world map, hold Up + A on controller 2 and select a fallen character with controller 1.
Source: ReyVGM

(GEN) Free walk:
Hold A on controller 2, while walking on the world map.
Source: ReyVGM

Kaiketsu Yanchamaru 3 - Taiketsu! Zouringen

(GEN) Stage select:
At the title screen, hold A + B on controller 2 and press Start on controller 1. Use A or B to select and Start to start the game on the desired level.
Source: ReyVGM

Karnov

All versions:

(GEN) Level select:
At the title screen, hold Right + A + B + Select on controller 1, then press A on controller 2 once for each level to be skipped. Finally, press Start on controller 1 to begin game play. Note: This may only be done up to level 9.

(GEN) Suicide:
During game, press A + B on controller 2.

Japanese version:

(GEN) Continue:
At the game over screen, press Select + Start% on controller 1. This may only be done three times.

Kickle Cubicle, Meikyuu Shima

All versions:

(GEN) Sound test:
Hold A + B on controller 2 and press Reset.

(GEN) Kid Niki easter:
At the title screen, before the title menu appears, hold A on controller 2 and wait until it appear.

Kid Klown, Mickey Mouse 3 - Yume Fuusen, Mickey Mouse - Dream Balloon (Prototype)

(GEN) Hard mode:
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A. This code is unlockable after you beat the game on the normal difficulty.

King Kong 2 - Ikari no Megaton Punch

(GEN) Continue:
At the game over screen, press B, A, Start.

Klash Ball

(GEN) Quick exit:
During the game, press Select + Start.

Krazy Kreatures

(GEN) Sorf reset:
Press A + B + Select + Start to return to the title screen.

(GEN) Level select:
Start a game, press Start to pause it. Hold A and press Select 10 times. Now lose the game and go back to the options screen at the beginning, you will be able to select from 24.

Kunio-kun no Nekketsu Soccer League

(GEN) Hissatsu attacks:
During a Nekketsu League match, pause the game then press A, A, A, B, A, A, A, B, A, A, A, A, A, A, A, then unpause.

Kurogane Hiroshi no Yosou Daisuki! - Kachiuma Densetsu

(GEN) Credits:
At the title screen, hold Select + Start then press A on controller 1.
Source: ReyVGM

Kyonshiizu 2

(GEN) Instant retire:
Whenever you fighting an enemy, pause the game, press Up + A + B on controller 2. You'll immediately be returned to the temple at the beginning of the day, but just with a half of your money.
Source: ReyVGM

Kyuukyoku Harikiri Stadium 3

(GEN) 80000 Edit Points:
At the main menu, enter the "さくせい" ("Edit") option. Now hold Right + Start and press A twice. You should get 80,000 edit points instead of 30,000.
Source: ReyVGM

(GEN) Credits:
At the main menu, enter the "せってい" ("Settings") option. There is a hidden invisible menu option at the end of menu, select it and press A.
Source: ReyVGM

Kyuukyoku Tiger, Twin Cobra

Japanese version:

(GEN) Unlockable:
When "the end" message appears on screen after the credits, a message "Your password is KTTAISONMAI89PRTN23Y" appears. There are no password entering modes either in FC nor in GEN or PCE versions. Password meaning is unknown. The English version haven't any staff messages nor a "password" messages, but text is still present in ROM.

Legend of Zelda, The, Zelda no Densetsu 1 - The Hyrule Fantasy

(GEN) Save screen:
During the game, hold Up + A on controller 2, then press Start on controller 1.

(GEN) Secret words:
Enter as player name:
ZELDA-Second quest

Les Chevaliers Du Zodiaque - La Legende D'or, Saint Seiya - Ougon Densetsu

Japanese version:

(GEN) Extra 999 EX glitch:
While playing, press Select to enter the menu. Enter the second option ("Ability"). Place the cursor on "End" and press Up + Right. If done right, the cursor will stay outside of the menu border. Now press B to increase your EX points to 999. This happens because of program bug, involving corruption of the variable shared between two different functions, which is used in menu and sound engine. Just by accident this bug cause exactly the same menu position that is need to be set to match the EX position. This bug was fixed in the French version.
Source: ReyVGM

Lion King, The

(GEN) Stage Skip:
Pause the game any time and press B, A, Right, Down to skip to the next stage.

Little Nemo - The Dream Master, Nemo - Pajama Hero

(GEN) Level select:
At the title screen, press Up, Select, Left, Right, A, A, B. A new menu option "DREAM SELECT" will appear. Highlight it and press A an equal amount of times as the desired level.

Locksmith

(GEN) Level and difficulty select:
At the level and lives display screen, hold A + B + Select. Now, press Up or Down to increase or decrease the level you're on, press Left or Right to decrease or increase the game's difficulty. This cheat is unlockable. The game will tell you this secret, when you beat all 8 levels.

Lone Ranger, The

(GEN) Secret passwords:
0810 7830 3251 2-Level select, as well as a full stock of money and bullets. The last three spaces of the password are unimportant and may have any value.

Magic John, Totally Rad

(GEN) Credits:
At the title screen, press Left, Left, Right, Up, Down, Down, Up on controller 2 then press Start on controller 1.

(GEN) Level select and Sound test:
At the title screen, press Up, Down, Down, Left, Left, Right, Right, Start on controller 1.

Mahjong Taisen

(GEN) Sound test:
Hold Down + B + Select and press Reset. The screen should stay black. Use Up or Down to scroll through the music.
Source: ReyVGM

(GEN) Skip the intro:
Before starting a new game at the title menu, hold Right + A + B on controller 2.
Source: ReyVGM

Majaventure - Mahjong Senki

(GEN) Debug mode:
In the map mode, hold Right + B on controller 2 to freely pass through the gates and enemies. While in a fight, hold Left on controller 2 and enter and exit back from the status screen to see the opponent's tiles.
Source: ReyVGM

Mario Open Golf, NES Open Tournament Golf

All versions:

(GEN) Credits:
At the title screen, hold Right + B + Select for a couple of seconds.
Source: ReyVGM

Matsumoto Tooru no Kabushiki Hisshou Gaku 2

(GEN) Password screen:
Hold A + B + Select + Start on controller 1, then press Reset. A password screen, otherwise unavailable on the title screen, will appear.
Source: ReyVGM

Meitantei Holmes - Kiri no London Satsujin Jiken

(GEN) Picture test:
At the title screen, press A 30 times then press Start.

Meitantei Holmes - M Kara no Chousenjou

(GEN) Secret passwords:
シーントバシ-Scene select
ビージーエムガキキタイ-Sound test
エガミタイ-Go anywhere
エンディングガミタイヨ-Ending
Source: ReyVGM

Mendel Palace, Quinty

(GEN) Bonus levels:
Hold Select + Start and press Reset.

Metal Fighter, Mei Loi Siu Ji (Sachen / Kinema Music / Color Dreams), Wei Lai Xiao Zi (Joy Van)

Joy Van / Color Dreams versions:

(GEN) Level select:
At the title screen, press Select a number of times one less than that of the desired starting level, then press Start. There is no such cheat in Joy Van version with the Chinese title and in Joy Van / Kinema Music version.

Metroid

(GEN) Secret passwords:
NARPAS SWORD0 000000 000000-Invincibility and Infinite Missiles

Mickey Mouse, Mickey Mousecapade

(GEN) Level warp:
At the title screen, hold Select and one of the following buttons, then press Start:
Up-Castle stage
Right-Ocean stage
Down-Pirate stage
Left-Woods stage

Moai-kun

(GEN) Stage select:
At the title screen, highlight Continue, then hold Down + Select, the cursor will return to the Start option, now press Start.
Source: ReyVGM

Momotarou Densetsu Gaiden

(GEN) Sound test and ending:
Complet all three scenarios of the game to unlock the hidden options "Sound Test" and "Ending" in addition to the Introduction menu option.
Source: KingMikeX

Momotarou Dentetsu

(GEN) Secret words:
Enter first three names in the 3-player mode as in table below. Note: C1 player name is "モモタロ" by default, do not change it! Or else you couldn't enter it again:
C1:"モモタロ" C2:"おんがく" C3:"しつ"-Sound test
C1:"モモタロ" C2:"びじゅつ" C3:"しつ"-Picture test

Money Game, The

(GEN) Extra 3 million yen:
First, go bankrupt. Then, on the game over screen, press A + B at the same time on both controllers. You'll go back to the title screen, start over and you'll have 3 Million Yen this time around.
Source: ReyVGM

Monster Party

(GEN) Secret passwords:
055*N-Level select passwords. Just put any number from 0 to 7 at N place. Note, "*" denotes a skull.

Ms. Pac-Man (Tengen)

(GEN) Soft reset:
Press A + B + Select + Start during the game play to return to the game menu. Press A + B + Select + Start again to return to the title screen.

Nekketsu Kakutou Densetsu

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

(GEN) Final battle:
At the title screen, hold Right + Select then press A. Select "STORY MODE" to advance to the final battle.

(GEN) Select same character:
At the title screen, hold A + B on controller 2 and press Start on controller 1 to allow both players to select the same character in "BATTLE MODE".

Nekketsu Kouha - Kunio-kun, Renegade

(GEN) Stage Select:
At the title screen, enter one of the following button codes to start with the desired stage, then start a new game.
Hold Left on controller 2 and press Down, Up, Right, Up, Left, Up on controller 1-Stage 2
Hold Down on controller 2 and press Up, Down, Left, Down, Right, Down on controller 1-Stage 3
Hold Up on controller 2 and press Down, Down, Up, Up, Right, Left on controller 1-Stage 4

New Ghostbusters II

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

New York Nyankies, Rockin' Kats

(GEN) Pause cheats:
During the game, press Start to pause game play. Press one of the following button codes to get corresponding effect.
Hold Down + A + B on controller 1, press Start-Easy mode. Gives to you 6 lives and maximum energy.
Hold Up + A + B on controller 1, press Start-Expert mode. Gives to you 0 lives and minimum energy.
A, A, A-Exit from the levels 1 to 5 to the main menu. If you play level 6, you'll be returned to the start of the level 6 instead.

Ninja Gaiden 2 - The Dark Sword of Chaos, Ninja Ryukenden II - Ankoku no Jashin Ken, Shadow Warriors Episode II - The Dark Sword of Chaos

NTSC versions:

(GEN) Sound tests:
Hold Up + Left + A + B + Select and press Start at the title screen, the Ryu character will appear. Press Start, wait until the title screen fades out, press Start again, hold Up + Left + A + B + Select and press Start to display Irene Lew. Finally allow the title screen to fade out and appears again twice, use the same cheat to display Ryu and Irene Lew and allow all music from the game to be played with a volume and song title display.

Ninja Gaiden 3 - The Ancient Ship of Doom, Ninja Ryukenden III - Yomi no Hakobune

Japanese version:

(GEN) Extra credits:
After beating the game, at the "The End" screen, wait 18 minutes to see the extra hidden message "TO BE CONTINUED".
Source: tcrf.net

Nobunaga no Yabou - Sengoku Gunyuu Den, Nobunaga's Ambition 2

(GEN) Sound test:
At the title screen, when the Daimyo slideshow starts, press Select and the words "Push Start Button" appears. Then press B to activate the Sound test or press A to see the Samurai & Ronin slideshow.

Orb 3D

(GEN) Cut fuel consumption by half:
Press A, B, Left, B, A, Right on the intermission screen between levels or before level 1 begins. Fuel use will be at half of normal.

Over Horizon

All versions:

(GEN) Change graphics:
Hold A + B on controller 1 and press Reset. Menu cursor will change to confirm correct code entry.

Japanese version:

(GEN) Sound test:
Hold Up + Select + Start on controller 1 and press Reset. There is no such cheat in the European version.

Overlord

(GEN) Extra credits:
At the title screen, or at the "Virgin" logo, press any button except Start to enable an extra credits screen with "Probe" logo and main staff names and pictures.

(GEN) Intro skip:
Before starting a new game, hold Left. This will skip the intro messages.

Palamedes

(GEN) Sound test:
At the title screen, hold A + B on controller 2 and press Start on controller 1.

(GEN) Ending sequence:
At the title screen, hold Right + A on controller 2 and press Start on controller 1.

Pin Bot

(GEN) Pause menu:
During the game, press B on controller 2 to enter the Pause menu, where you can switch on and off music, speech or sound effects, using the controller 2.

Pocket Monster (Early Super Game), Panda World, Super PoPo's Adventure

Poket Monster version:

(GEN) Debug mode:
During the game, on pause, use the D-Pad buttons to place the character at any part of the stage or press Select to skip current level. There also a debug memory viewer, disabled in all versions of this game, but only in this version there a leftover from it: on pause press A + B to hear a sound, which index is controlled with one of the vars, used for memory viewer previously. If you change address $0004, you'll hear a different sounds any time you press A + B.

Predator

All versions:

(GEN) Suicide at normal level:
Any time during normal levels, press Start, then A or B.

Pro Yakyuu - Family Stadium '88

(GEN) Credits:
At the title screen, hold A + B on controller 1 then press Start.

Probotector II - Return of the Evil Forces, Super C, Super Contra

All versions:

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

Punisher, The

(GEN) Credits:
Every fifth demo loop (copyright screen, shot animation, title screen, period...) will start with the Credits screen instead of the Copyright screen. Otherwise this screen can be seen after the completing the game.

Puyo Puyo

(GEN) Sound test:
At the main menu, hold Up + A + B then press Start.

(GEN) Different background graphics:
At the main menu, hold Down and press Start.
Source: ReyVGM

Puzslot

(GEN) Extra stage select:
At the title screen, press B, B, B, B, B, A, A, A, then hold Down and press Start. If done right, you'll be able to select levels 5, 10, 15 and 20.
Source: ReyVGM

Q Boy (Sachen)

(GEN) Stage select and Sound test:
At the title screen, simply press Select to go to a screen that lets you start at any level or cutscene and listen to the game's music.

(GEN) Mario character:
During the game, press Start to pause the game, then press Select to toggle between Q-Boy and Mario characters.

Quattro Adventure (Codemasters)

Treasure Island Dizzy game:

(GEN) Controller 2:
At the title screen, press Start on controller 2 to play the game with controller 2.

R.B.I. Baseball 2

(GEN) Credits:
At the title screen, hold A + B on controller 1 then press Start.
Source: ReyVGM

R.B.I. Baseball 3

(GEN) Credits:
At the title screen, hold A + B on controller 1 then press Start.
Source: ReyVGM

R.C. Pro-Am 2

(GEN) Secret words:
Enter one of following words as a player name:
NES-Extra $5000
DMG-Extra continue

Rad Racer 2

(GEN) Continue:
At the title screen, hold A and press Start to resume game play at the last track.

Radia Senki - Reimei Hen

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

Raid on Bungeling Bay

(GEN) Microphone controls:
There are 3 game modes in this game. The game mode "2 play" allows to control the enemy's ground turrets from controller 2, the second player can move turrets with D-Pad, fire with A or B with guns and rockets accordingly. There is one more control method actually exist in "2 play" mode. The second player can shout to the microphone on controller 2. Shout once or more and a small gray icon of microphone will appear at the top-middle of the screen. If you shout constantly, the microphone icon will turn pink. If icon is pink, then all flying enemy fighter jets will fly over the screen instantly, no matter where they have been before. So you literally call for reinforcments. This only works if any of enemy jets are in the air already, which is happens after a while during the game. This control method present in NES version too, but can't be used due to lack of microphone on controller 2 of it.

Remote Control

(GEN) Easter Egg:
At the character selection screen, press Select to change the name of the character. Name the first character "PLEASE", press Select then Right to switch to next character, name the second character "SHOW" and the third character "RSP" and press Start. There will be digitized pictures of the game developers Mike Riedel, Remington Emin and Eric Shefferman. If you press A or B or both, each of them will change it's face.

Robin Hood - Prince of Thieves

(GEN) Secret passwords:
At the title screen, press A, A, A, A, A, A, A, A, B, B, B, B, B, B, B, B. The following passwords may now be used to start at the corresponding game location.
CATACOMB-Outside Arab jail
WALL-Hadrian's Wall
LOCKSLEY-Locksley Castle
DUBOIS-Dubois Manor
CHASE-Horse race to Sherwood
CATHEDRA-Rescue the maiden
BOAR-Battle the boar
MASTER-Search for Master Trainer
CHAPEL-Meet Marian at chapel
WELL-Search for haunted well
TAX-Attack gold wagons
POND-Search for healing water
VILLAGE-Defense of Sherwood Village
CELTS-Battle Celts
TOWN-Journey to town
TOWNHANG-In town, by gallows
CASTLEIN-Inside Sheriff's castle
WEDDING-End

Robocop

(GEN) Unlimited continue:
At the game over screen, hold A + B + Select and press Start.

Romancia

(GEN) Secret ending image:
After the ending credits, when the portrait of you and Celina with the word "FIN" appears, press A 10 times and a closeup image of both characters will be shown.
Source: ReyVGM

(GEN) Sound test:
At the "PRESENTED BY..." screen, hold Up + A + B + Select and wait until the title screen appears.
Source: ReyVGM

Scarabeus (Prototype)

(GEN) Secret passwords:
IGORSAYSWARP-The level skip, by press Select during the game.

Saiyuuki World 2 - Tenjoukai no Majin, Whomp'Em

(GEN) Sound test:
At the title screen, hold A + B on controller 2 then press Start on controller 1, continue holding A + B until sound test mode appears.

Sangokushi II - Haou no Tairiku

(GEN) Sound test:
At the title screen, at the player selection menu, on controller 1 hold A then press Up, Down, Left, Right. This and all following cheats can be entered very easy, because there is no fails check at all, only correct pressings are counts while you holding corresponding buttons. So you can just mash all D-Pad buttons before the cheat is triggered.

Sanrio Carnival

(GEN) Extra level select:
At the game selection menu, choose the third option from top. Now, at the description scree hold A + B on controller 2, then press A or Start on controller 1. You can now choose from levels 7-12 instead of 1-6.

Secret Ties (Prototype)

(GEN) Options menu:
At the title screen, press Select to switch to the cheat option menu, where you can select any stage, listen to music or sounds and enable or disable invincibility.

Seicross

(GEN) Continue:
At the title screen after the game over screen, hold A and press Start.

(GEN) Adjust difficulty:
At the title screen, hold Left + A + B on controller 2, then press A on controller 1.

Seikima II - Akuma no Gyakushuu

(GEN) Continue:
After the game over screen, hold A + B on controller 2 and press Start on controller 1 to continue in the area where you died. Your score is reset to 0, but you will have 1000 life and keep your items/weapons.

Shanghai

(GEN) Secret message:
At the title screen, wait until the credits roll appears or use previous cheat, then hold Down + Right + A + B + Select.
Source: ReyVGM

Shatterhand, Tokkyuu Shirei - Solbrain

(GEN) Debug menu:
At the title screen, press A, A, A, A, B, B, B, B, A, B, A, B, A, B, A, B when the message "PUSH START" appears.

Shin 4 Nin Uchi Mahjong - Yakuman Tengoku

(GEN) Free player character select:
In a free game mode, at the opponent selection screen, hold one of the following buttons then press B to get a corresponding effect.
Start-Select any character for the Player 1
Select-The same as previous, but the Player 1 will be computer controlled.
Source: ReyVGM

Shingen The Ruler, Takeda Shingen 2

All versions:

(GEN) Max Everything:
At the game menu, select "Mi", then "Enlist", select 1 and highlight "No". Now, hold Down + A on controller 2 and press A on controller 1. You should hear a faint sound confirming the entry. Now, while still holding the buttons on controller 2, hold at the same time Up + B + Start on controller 1. Release the controller 2 buttons and the word "Which" will appear. Release the controller 1 buttons and the numbers "01" will appear. The numbers are the same numbers of the countries in the game. Just select 01 to start with the default country and everything maximized.
Source: ReyVGM

(GEN) Climate disasters don't affect tou:
At the game menu, select "Sv" and highlight "No". Now, hold Up + Right + A on controller 2 and press A on controller 1. If done right, you'll be able to move your troops and call the merchant even during snowstorms and typhoons.
Source: ReyVGM

Japanese version:

(GEN) Sound test:
Hold Select + Start on controller 1 and press Reset. At the Hot-B logo, release the buttons and hold Right + A + B on controller 2. The sound test should appear after the Hot-B logo.
Source: ReyVGM

Shinobi (Tengen)

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

Simpsons, The - Bart Vs. the Space Mutants

(GEN) Sound test:
On level 1, shoot the "E" letter of the "Quik-E-Mart" sign with a rocket. Then catch extra life item. You will be rewarded by three extra lives and new Sound Test option in the game items menu. Choose it by pressing Select.

(GEN) Secret item 1:
In the first stage, stand on the awning above Tool World's door. From there, jump to the left, and try to position yourself just to the right of the first bush you see. If done correctly, you should land on top of the grass. Press Down to drop down, and the initials "RK" will fall from above. Catch it to obtain a life. This also changes the enemies on the left into the initials "LK/AK", though they will return to normal if you leave the area. These may be relatives of Garry and Dan Kitchen, two of the game's designers/programmers, or possibly Jesse Kapili, the game's artist.
Source: tcrf.net

(GEN) Secret items 2:
In the second stage, the second trash can on the second floor can be jumped on repeatedly to release a plethora of useful items, including coins, hats, a 1-up, invulnerability, and even more mysterious initials "RW", "AW", "KW", "JW". These are probably relatives of Henry C. Will IV, one of the game's programmers. Each one is worth one coin.
Source: tcrf.net

Skate or Die 2 - The Search for Double Trouble

(GEN) Level select:
Select adventure mode. Press Start, A, Select, B on controller 2 during the game play. Then, press:
Right-Mall
Left-Beach
Up-Planet level.

Sky Destroyer

(GEN) Bonus object Satellite:
Destroy two air fortresses in row and all planes in sky will destroyed at once and you will see falling satellite. If you shoot it you will be rewarded.

(GEN) Bonus object Dirigible:
Destroy floating battleship just before it disappear at horizon and you will see flying dirigible. If you shoot it you will be rewarded.

Solomon no Kagi, Solomon's Key

(GEN) Continue:
At the game over screen, hold Up + A + B.

Son Son

(GEN) Invincibility:
At the title screen, hold Down on controller 2 and on controller 1 press A 36 times, B 6 times, then again A 10 times and Start.
Source: ReyVGM

Space Harrier

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

(GEN) Special effects:
Do the sound test code, then play the songs in following order: 7, 4, 3, 7, 4, 8, 1.

(GEN) Stage Select:
Do the sound test code, then play the songs in following order: 7, 6, 5, 4, 3, 2, 1.

Spot

(GEN) Display the Credits:
Set all four players to AI level 5, and just sit back and let the NES play against itself. Once the game is over, the ending cinema will display the credits instead of the usual "Wins!".

Square no Tom Sawyer

(GEN) Soft Reset:
During the game press Select + Start on controller 1.

(GEN) Secret message:
Start a new game, then go to the game menu (press Select), select bottom option, then top "ししょう" ("Master") and bottom options "けってい" ("Select") again (for Tom). Now enter as a master name words "ホワイトラビット" ("White Rabbit"). Then select the top-right option "きめる" ("Accept"), hold B on controller 2 and press A on controller 1.
Source: ReyVGM

Star Soldier, Star Soldier Special Version

Special version:

(GEN) Soft reset:
Any time during the game press Select + Start.

Star Trek - The Next Generation

(GEN) Secret passwords:
LORE-Ensign Ranking
SELA-Lieutenatn Ranking
SAREK-Lt. Commander Ranking
SOONG-Commander Ranking
VASH-Captain Ranking
OVERRIDE-Mission Select. Press B to exit the password entry mode. Start a new game. On the briefing screen press Up on controller 1 to switch to the next mission.
WHOOSH-Sound test. Use buttons on controller 2 to select and play sounds.

Star Wars (Namco)

(GEN) Continue:
At the game over screen (with Darth Vader's head) hold Up and press A 8 times. This can be done only twice.

(GEN) Level select:
Hold Up + Down and press Start on the title screen to access a level select. Note that it is normally impossible to do this on a real (and properly functioning) controller.
Source: ReyVGM

Star Wars - The Empire Strikes Back

(GEN) Secret credits:
On the very first level, head as far left as you can in the level. Quite low down you hit a large textureless turquoise wall of ice. This can be destroyed in places with your light-sabre or blaster in a diagonal left-upward path. Once through, work your way all the way up to a Force-Power item. When you pick it up, you suddenly get some pictures of the people that made the game.

Street Fighter III

(GEN) Life drain:
During the game, press Up + Start then Start one more time. The life's bar of your opponent will be drained out. This cheat only works in generic "Street" versions or it's hacks. The "Super" version have a different controls reading procedure, which haven't that cheat at all.

Summer Carnival '92 - Recca

(GEN) Infinite lives:
Enter "change limit" mode and before pressing Start to exit to the title screen, hold Up + A + B + Select.

Sunman (Prototype)

(GEN) Level skip:
Pause the game then press A + B on controller 2.

Super Contra 7

(GEN) Extra 50 lives:
At the title screen menu, hold A or B and press Start. There is another way to trigger the same cheat. At the title screen animation or title menu, hold Up on controller 1 and press B, B, B, B, B, then hit Start.
Source: Inchie

(GEN) Credits:
At the title screen menu, hold A + B and press Start. The same credits screen will appears every time after the last demo level at the title screen.
Source: Inchie

Super Dyna'mix Badminton

(GEN) Secret passwords:
Enter this secret password, then hold A + B on controller 2 and press Start on controller 1.
BOMP-Ending sequence.
Source: ReyVGM

Super Mario Bros., All Night Nippon Super Mario Bros., VS Super Mario Bros.

All versions:

(GEN) Continue:
At the title screen, after the game over screen, hold A, then press Start to start from previously played world, but not sub world.

Regular versions:

(GEN) World select:
At the title screen, after beating the game, press B to change the starting world number. This code is unlockable and will be given to you at the congratulations screen after beating the game. This code isn't present in the "All Night Nippon Super Mario Bros." version and the Arcade version.

Super Mario Bros. 2, Super Mario USA

(GEN) Suicide:
During the game, press Start to pause it, then press Up + A + B on controller 2. Unpause to die immediately.
Source: ReyVGM

Sword Master

Japanese version:

(GEN) Warp to level 7:
At the title screen, hold A + B on controller 2, then press Start.
Source: ReyVGM

Taito Chase H.Q.

(GEN) Level select:
At the title screen, when "PRESS START" message appears, hold Down + A + B and press Start. The number "11", which represents a game level, will appear instead of a score. Press A or B to change this number and begin game play at the selected level.

Taiyou no Shinden - Asteka 2, Tombs and Treasure

(GEN) Debug mode:
Start the game, then take all items on the table and exit the lab. Now enter the Nunnery just north in the the US version. In the Japanese version you start at different location and Nunnery is somewhere south-west. When in the Nunnery, take the Ixmol Jewel held by the statue, wash the Ixmol Jewel, put Sword, wash Lighter. Then you should see the message "Nothing has changed", now hold Select + Start and press A and the numbers "3 00" will appear. Hold B, press Up or Down to select an area, press Left to change to the new area and then Start to begin the new area. Press Up or Down for item select, press A to turn item "on" or "off" the new item and press Start to enable the changes. Additionally exit the debug menu by pressing Start, then highlight "PULL", hold Select + Start and press A. The number 64 should appear, then press Left or Right to switch between sounds and press Up to listen to it. Press Down to stop listening to the selected tune.
Source: nesworld.com

Takeshi no Chousenjou

(GEN) No-mic mode:
To play this game, you need an internal microphone sometimes to call for a help. Any time you shout to the microphone, the character answers "もしもし", like on the telephone. To switch this controls to the buttons, on controller 2, press Down + A to disable the mic controls, and then press A instead of shouting into the mic. To enable the mic control back, press Up + A on controller 2.

(GEN) Instant continue:
When you ran out of health, before the game over screen, quickly press A + B exactly three times. Instead of the game over screen, the healths will be refilled and you will continue to play from the same point.
Source: ReyVGM

(GEN) Secret message:
In the ending, if you wait 5 minutes, Takeshi will tell you not to take this game so seriously.
Source: ReyVGM

Tatakai no Banka, Trojan

(GEN) Continue:
At the title screen, after getting the game over screen, hold Up on any controller, then press Start.

Tecmo Super Bowl

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

Teenage Mutant Ninja Turtles II - The Arcade Game, Teenage Mutant Hero Turtles II - The Arcade Game, Teenage Mutant Ninja Turtles (Japan)

US version:

(GEN) Extra 10 lives:
At the title screen, press Up, Right, Right, Down, Down, Down, Left, Left, Left, Left, B, A, Start before the demonstration starts.

(GEN) Stage Select:
At the title screen, press Down, Down, Down, Down, Down, Right, Right, Right, Right, Right, Right, Right, B, A, Start before the demonstration starts.

(GEN) Stage Select, extra 10 lives:
At the title screen, press B, A, B, A, Up, Down, B, A, Left, Right, B, A, Start before the demonstration starts.

Teenage Mutant Ninja Turtles III - The Manhattan Project, Teenage Mutant Ninja Turtles 2 - The Manhattan Project (Japan)

All versions:

(GEN) Auto mode:
At the player selection screen, press Down 5 times for one player game, or 10 times for 2 players game to enable "auto mode", which will automatically select a next turtle after the death, instead of manual selection.

Tetris (Nintendo)

(GEN) Higher levels:
At the level selection screen in any mode, select a desired level, then hold A and press Start. The level number will be increased by 10.

Tetris (Tengen)

Console version:

(GEN) Increase game level:
Pause the game, press Up, Down, Up, Down, Left, Right, B, B, A, then press A up to 17 times.

(GEN) Remove block:
Pause the game, press Left, Down, Right, Up, Left, Down, Right, B, A. Works once per game.

Tetris 2 + Bombliss

(GEN) SRAM clear:
At the "Select Player" screen, enter the "Eliminate Name" menu. Highlight "Exit", hold Down + A + B on controller 2 and press Start on controller 1. If done right, you'll have the option to delete all the save files at once. As a side effect, if you do so, press B at the "Select Player" screen to go back to the title screen and select "2 Players". While playing, all the blocks will be Line Blocks.
Source: ReyVGM

Thexder

(GEN) Infinite energy:
Power the console on, then on controller 1 hold Up + A, press Reset, release the buttons, hold Up + B, press Reset, release the buttons, hold Down + A, press Reset, release the buttons, hold Down + B, press Reset, release the buttons, hold Left, press Reset, release the buttons, hold Right, press Reset, release the buttons, and finally hold Select then press Reset.
Source: ReyVGM

Thunderbirds

(GEN) Level skip:
Pause the game then press Up + Left + A + B + Select and then unpause the game.

Thundercade

(GEN) Secret ending:
After completing the game, wait for a hour at the ending animation screen to see the secret ending animation and programmer's message.

Tiger-Heli

(GEN) Continue:
At the game over screen, hold A + B.

Tiny Toon Adventures

All versions:

(GEN) Contrioller 2 input:
Althought the game is only for 1 player, you can play either with any of controllers, just press Start at the title screen on corresponding controller to play the game with. Anyway, you sill couldn't use the second controller to enther the title screen cheat codes.

Titan

(GEN) Secret passwords:
L1FEGAME-Unlockable password given to you after beating the final 80th round. You can play a mini-game of life.

TM Network - Live in Power Bowl

(GEN) Good ending:
In order to get the good ending, you must press Start when the countdown timer reaches 00. Pressning this button any other time or not pressing it lead to the bad ending.

Toki no Tabibito

(GEN) Location select:
At the title screen, hold A + B then press Start. During the game, press Select to make two digit appear. Available locations are from $00 to $38, the rest is just glitches.

Tom & Jerry and Tuffy

(GEN) Infinite lives:
At the title screen, with "Tom & Jerry (and Tuffy)" title, press Right, Right, Up, Left, Up, Right, Down, B, A, Select. A sound will confirm correct code entry.

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

Top Gun - Dual Fighters, Top Gun - The Second Mission

(GEN) Extra 3 planes:
When the light spot shows up parts of the title screen, but before the cutscene starts, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start on controller 2 (on controller 1 for the European version). A sound will confirm correct code entry. Whenever you reach 20000 points, you will be rewarded with three extra planes instead one.

Touhou Kenbun Roku

(GEN) Black & White mode:
Any time during the game, hold Up + B on controller 2.
Source: ReyVGM

Tower of Druaga, The

(GEN) Another Druaga:
At the title screen, press Up, Up, Up, Up, Up, Up, Left, Left, Left, Left, Right, Right, Right, the title will turn green to confirm correct code entry. This cheat is unlockable after beating the game on the normal difficulty. If you beat "Another Druaga", you'll see different staff roll and congratulation message.

(GEN) Special item cheats:
During the normal game, you should collect a specific items. Each level has its own unique condition to obtain this items. There are three levels and three corresponding special items, that may be obtained only via special button sequence code, entered on controller 1 while on the level. There is the list:
Level 22-Right, Right, Right, Right, Right, Right, Right, Left, Right, Right, Right, Right, Right, Right, Right-Sap drink.
Level 29-Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down, Left-Gold pickaxe.
Level 39-Up, Up, Down, Down, Down, Down, Down-Red ring.

Treasure Master

(GEN) Secret passwords:
3HDJL9DNQV2WYTV4S91RXR86-Secret world 1
xxxxxxxxxxxxxxxxxxxxxxxx-Secret world 2 (password still unknown, ask Ste Ruddy!)

Ultraman Club - Kaijuu Dai Kessen!!

(GEN) Level select:
At the title screen, wait util "PRESS START" appear, then hold one of the following buttons on controller 2 and press Start on controller 1.
Up + A + B-Stage 2
Right + A + B-Stage 3
Down + A + B-Stage 4
Left + A + B-Stage 5
Source: ReyVGM

Utsurun Desu

(GEN) Stage select:
After power the console up, hold A + B + Select and and press Start until the real title screen appears, then press Start once more. A screen will stay black. Press B to increase the starting level number. Press A to play a level.
Source: ReyVGM

Valis - The Fantastic Soldier

(GEN) Sound test:
Hold Right on controller 2, then press Reset. At the title screen, release the button and by pressing the A on controller 1 ou can change the background music.

Wagyan Land

(GEN) Higher difficult:
At the title screen, press Down, Down, A, Down, Down, Down, B, Down. This sequence is unlockable and given to you after the ending staff roll.

(GEN) Boss rush mode:
At the title screen, press Up, Up, A, Up, Up, Up, B, Up. This sequence is similar to the unlockable sequence above, but with Up instead of Down.

Wario no Mori, Wario's Woods

(GEN) Soft reset:
Any time during the game, hold either Select or Start and press Start or Select accordingly to return right to the main title menu.

Win, Lose or Draw

(GEN) Secret words:
Select the difficulty level as Difficult, then during the game, enter one of the following words as an answer to the current game question.
LORDOFTHEWABBITS-Easter rabbit, greetings from programmer.
SHOWMERSPINC-Developer's picture and copyrights.

Wing of Madoola, The

(GEN) Continue:
If you die on Stage 2 or higher, when it brings you back to the title screen, hold Select and press Start. You can choose any stage up to the one you died at, but not higher.

(GEN) Easter egg:
There a special room on Stage 8 where you can find a small chick. If you grab it as an item, the secret screen "THE KEYWORD IS" will follow, continuing with a small cat graphics and kana text "ねこだうーん" screen. Maybe there was some sort of competition back in the days, but maybe just an easter egg, since this chick only in the middle of the game and easy reachable.

Woody Poko

(GEN) Easter egg:
Enter the Bread Store, stand in front of the desk with the girl and press A or B 200 times. If done right, the girl will put on a bikini. You can done it as many times as you want, just you need to press the button 256 times every time now.
Source: ReyVGM

Wrecking Crew

(GEN) Special edit mode keys:
During the edit mode, press one of the following button codes on controller 2 to automatically fill the level buffer with corresponding predefined data.
A + B-Reset level to the initial state.
Right + A-Fill with empty cells.
Left + A-Fill with wreckable ladders.
Down + A-Fill with regular ladders.
Up + A-Fill with bombs.
Right + B-Fill with wreckable shields.
Left + B-Fill with black walls.
Down + B-Fill with white walls.
Up + B-Copy the regular level selected at the title screen with A and B buttons. Note, in this case you can see an actual level name, which is sitting in level data, but doesn't show during the normal game.

Yoshi no Cookie, Yoshi's Cookie

(GEN) Extra levels:
In the options, turn off the music, set the game to high speed and to Round 10. After that, hold Up and press Select. The Round now will be at "11". Keep pressing Select to make the round go higher.

Youkai Club

(GEN) Continue:
The game has a weird continue/password system. After you beat the level, the code is displayed in the game HUD, which is a cheat sequence you must to enter at the stage display screen in order to continue from the desired level. However, this can be done only for levels 2 and 3. Here is the level codes:
Up, Up, A, Right-Level 2
Up, Left, B, Up-Level 3

Zanac

(GEN) Secret message:
Beat the game, then at the credits screen, when the fairy stops to print out a main message, press A + B on both controllers at the same time. A message "SEE YOU AGAIN IN GUARDIC." will appears at the bottom of the screen.

(GEN) Game Over Easter egg:
Before the "GAME OVER" message is displayed, hold Select on controller 1 to change default game over music jingle to the different one.

Zelda II - The Adventure of Link

(GEN) Suicide:
Press Start on controller 1 to show the items menu, then press Up + A on controller 2.

 

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