Mostly Unpublished NES Cheats ;)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.

  100 Man $ Kid - Maboroshi no Teiou Hen, Casino Kid
  8 Eyes
  Aces - Iron Eagle 3, Ultimate Air Combat
  Adventures of Lolo 2 (US), Adventures of Lolo (Japan)
  Adventures of Lolo 3 (US), Adventures of Lolo 2 (Japan)
  American Dream
  Arabian Dream Scheherazade, Magic of Scheherazade, The
  Battleship
  Bomberman II, Dynablaster
  Break Time - The National Pool Tour
  Bucky O'Hare
  Burai Fighter
  Captain Ed
  Captain Planet and The Planeteers
  Chip's Challenge (Prototype)
  Clash at Demonhead, Dengeki - Big Bang!
  Dai Meiro - Meikyuu no Tatsujin
  Daiva - Imperial of Nirsartia
  Dirty Harry
  Doki! Doki! Yuuenchi, Trolls in Crazyland, The
  Downtown - Nekketsu Monogatari, River City Ransom, Street Gangs
  Dragon Scroll - Yomigaerishi Maryuu
  Dynowarz - Destruction of Spondylus
  Earth Worm Jim 2 (Shin-Shin)
  Eggland - Meikyuu no Fukkatsu
  Elysion
  Erika to Satoru no Yume Bouken
  F-117A Stealth Fighter
  Fighting Road
  Flying Warriors, Hiryuu no Ken II - Dragon no Tsubasa
  G.I. Joe
  Ganbare Pennant Race!
  Gargoyle's Quest II - The Demon Darkness, Red Ariimaa 2
  Godzilla - Monster of Monsters!, Godzilla
  Guardian Legend, The, Guardic Gaiden
  Gun Sight, Laser Invasion
  Hiryuu no Ken III - 5 Nin no Ryuu Senshi
  Honoo no Doukyuuji - Dodge Danpei
  Ide Yousuke Meijin no Jissen Mahjong 2
  Ike Ike! Nekketsu Hockey Bu - Subette Koronde Dai Rantou
  Infiltrator
  Isolated Warrior, Max Warrior - Wakusei Kaigenrei
  James Bond Jr
  Jesus - Kyoufu no Bio Monster
  Jikuu Yuuden - Debias
  Kaettekita! Gunjin Shougi - Nanya Sore!
  Kame no Ongaeshi - Urashima Densetsu, Xexyz
  Keroppi to Keroriinu no Splash Bomb!
  Kick Master
  Krusty's Fun House
  Layla
  Little Ninja Brothers, Super Chinese 2 - Dragon Kid
  Little Samson, Seirei Densetsu Lickle
  Lone Ranger, The
  Low G Man
  Mad Max
  Magnum Kiki Ippatsu - Empire City - 1931
  Mahou no Princess Minky Momo - Remember Dream
  Maniac Mansion (Japan)
  Meimon! Dai San Yakyuu Bu
  Meitantei Holmes - M Kara no Chousenjou
  Metal Slader Glory
  Metroid
  Michael Andretti's World Grand Prix, Nakajima Satoru - F-1 Hero
  Mike Tyson's Punch-Out!!, Punch-Out!!
  Mission Impossible
  Momotarou Densetsu
  Monster Party
  Motocross Champion
  Nakajima Satoru - F-1 Hero 2
  New York Nyankies, Rockin' Kats
  Parallel World
  Parasol Henbee
  Puzznic
  Robin Hood - Prince of Thieves
  Rocketeer, The
  Scarabeus (Prototype)
  Shufflepuck Cafe
  Silver Surfer
  Smurfs, The
  Stanley - The Search for Dr. Livingston
  Star Trek - The Next Generation
  Super Chinese 3
  Super Dyna'mix Badminton
  Tatakae!! Rahmen Man - Sakuretsu Choujin 102 Gei
  Tenkaichi Bushi - Keru Naguuru
  Titan
  Toukon Club
  Tokyo Pachi Slot Adventure
  Toxic Crusaders
  Treasure Master
  Venus Senki
  Who Framed Roger Rabbit
  Zoids Mokushiroku

Summary:
secret password games-100

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

US version:

(UNI) Secret passwords:
Instead "_" symbol you should use "FORWARD" option on the password entering screen. Secret passwords need to be enabled before the game. When you entering level and splash screen gives an advice to you, hold Start before pressing A to skip splash screen.
i_am_a_richman-Gives you $100000.
i_wanna_see_the_king-Final poker battle with the King (Elvis is alive! ;)). If you win you'll see ending sequence. Also enables the Debug mode, see below.
i_wanna_go_bankrupt-Takes you to the game over screen (strange cheat).
debug_monitor_switch_on-Debugging functions.
In addition to A + Start on controller 1, hold Left + A on controller 2 before skipping the splash screen.
To switch to in game debugging monitor hold Left + A on controller 2 then press Start on controller 1,
"MONITOR VERSION 1.00 PRESENT BY HIRO" screen appears. You will be able to view game events, play music and sounds.

8 Eyes

US version:

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

Aces - Iron Eagle 3, Ultimate Air Combat

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

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

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

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.

American Dream

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

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

Battleship

(UNI) Secret passwords:
0914-Unlimited weapons
0528-Shows enemy grid after the player's grid when push Start

Bomberman II, Dynablaster

(FIX) Secret passwords:
US|Japan-Effect
K3456712|PCDEFGAB-Sound test
K138BHDJ|PACHINKO-Manual detonator
K1HB3G1H|PANICMAN-Semi manual detonator
KJH5C13D|PONEJACK-Bonus stage
K2JG2135|PBOMBACE-Small primer time
K2JG2G1H|PBOMBMAN-Normal primer time
K2JG2JF4|PBOMBOLD-Long primer time

Break Time - The National Pool Tour

(UNI) Secret passwords:
SJNG-Sound test
FNDG-Ending
VRHK-Speech test

Bucky O'Hare

All versions:

(GEN) Secret passwords:
HARD!-Hard mode

Burai Fighter

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

Captain Ed

(UNI) Secret passwords:
こひあ-Invulnerability for all game modes.

Captain Planet and The Planeteers

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

Chip's Challenge (Prototype)

(UNI) Secret passwords:
cred-Credits screen
hard-Extra 13 Levels (no pass for them)
ybli-Ending screen
jhen-Extra Level 133 "CAKE WALK"
coza-Extra Level 134 "FORCE FIELD"
rgsk-Extra Level 135 "MIND BLOCK"
digw-Extra Level 136 "SPECIAL"

Clash at Demonhead, Dengeki - Big Bang!

Japanese version:

(UNI) Secret passwords:
TENSAIWAWASURETA
KOTOWOOMOIDASUYO
-Full HP/MP and equipment.

US version:

(UNI) Secret passwords:
TENSAIWAWASURETA
KOTOWOOMOIDASU
-Full HP/MP and equipment.

Dai Meiro - Meikyuu no Tatsujin

(UNI) Secret passwords:
OWARIDAI-Ending sequence

Daiva - Imperial of Nirsartia

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

Dirty Harry

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

Doki! Doki! Yuuenchi, Trolls in Crazyland, The

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

Downtown - Nekketsu Monogatari, River City Ransom, Street Gangs

English versions:

(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

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").

Dynowarz - Destruction of Spondylus

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

Earth Worm Jim 2 (Shin-Shin)

2-in-1 game version Part 2:

(UNI) Secret passwords:
XFILE-Easter Egg

2-in-1 game version Part 4:

(UNI) Secret passwords:
NBA96-Easter Egg

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.

Elysion

(UNI) Secret passwords:
Enter one of the following password to enable the location warp for the corresponding class, along with higher specs/experience, etc. During the game press Start to warp to the next key location (just like in Crystalis/God Slayer). At some points in the game you can switch current class and continue to warp to the corresponding locations, which is different for every class. There is no indication, where it can be enabled, depending on the story itself, but if you at the such point, press A 5 times, then press Select to cycle between 4 possible ways to continue, then press Start to warp to selected story line.
たいりよ くいちば んみのすくん-Minos class.
せいせき ゆうしゆ うあいれ ちやん-Aylex class.
おによが はやいぞ でおねあ ちやん-Dionea class.
みりよく さいこう びすかむ くん-Viskam class.
くかいら いんじい ていえす-Minos class, ultimate specs/experience, etc.

Erika to Satoru no Yume Bouken

(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

F-117A Stealth Fighter

(FIX) Secret passwords:
Select "saved..." game mode, enter the player name, then enter:
4093CB1#-Now you can select any mission in "Theater" menu and invulnerability will be enabled.
#1BC3904-Message "USAF regulations do not permit save codes taken from game manuals.".

Fighting Road

(UNI) Secret passwords:
TO LAST !!-Ending sequence
DEBUG*MODE-Enable in game debugging mode.
Pause the game and use following buttons to get additional effects:
A-Toggle player's invulnerability
B-Toggle enemy's invulnerability
Select-Enemy kill
Up-Restore player's health
Down-Fill power bar
Left-Restore enemy's health

Flying Warriors, Hiryuu no Ken II - Dragon no Tsubasa

US version:

(UNI) Secret passwords:
MUSIC-Sound test
END-Ending
888-Characters presentation. One by one will be displayed characters cards with short descriptions.
8xy-Level select.
x - stage number from 1 to 4.
y - substage number from 1 to 3.
For example, password "843" means the latest stage.
Source: Yakovlev Victor

Japanese version:

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

G.I. Joe

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

Ganbare Pennant Race!

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

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

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

Godzilla - Monster of Monsters!, Godzilla

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

Guardian Legend, The, Guardic Gaiden

(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 Sight, Laser Invasion

Japanese version:

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

Hiryuu no Ken III - 5 Nin no Ryuu Senshi

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

Honoo no Doukyuuji - Dodge Danpei

(UNI) Secret passwords:
HEBE-Cut scene test mode. You can select one of game cut scenes to play.

Ide Yousuke Meijin no Jissen Mahjong 2

(UNI) Secret passwords:
Enter as password in Story Mode:
いいてぶく ろいいようふく
いいはいが わたしはほしい
-Max Stats at Start
おかねほし いおかねほしい
これであな たもおかねもち
-200,000 Money, Max Stats, and All Equipment
おかねほし いもつとほしい
にじゆうま んぐらいほしい
-80,000 Money

Ike Ike! Nekketsu Hockey Bu - Subette Koronde Dai Rantou

(UNI) Secret passwords:
7031-Sound test
4728-Harder scenario
Source: Johnny Undaunted

Infiltrator

(FIX) Secret passwords:
NERV-Begin Flying mission 2
HOOT-Start at Enemy base 2
GUMP-Begin Flying mission 3
BOMB-Start at Enemy base 3

Isolated Warrior, Max Warrior - Wakusei Kaigenrei

(UNI) Secret passwords:
Using any of these passwords will lock you out of stage 7 (continue flag $06C8=01).
6502-Full HP and bombs
6285-Full weapon power
6666-1 HP
5350-Invalid, no effect (password routine bug; should stop checking at 6666)
Source: BMF54123

James Bond Jr

(FIX) Secret passwords:
012345-Sound test
888888-View credits
181287-Unlimited bullets, 99 lives, 99 mins
170167-Easy enemies
200888-Silly hard enemies

Jesus - Kyoufu no Bio Monster

(UNI) Secret passwords:
ふあみこん せいさくの なかまたち みせてくれ-Secret staff message. First, a normal staff roll appears, then a secret staff roll will be displayed.
もつくんは わかままて れいさろん ひきたかる-Piano mini game. You can play simple melodies by pressing piano keys.
はいもとの えみさんへ とくさんの よめにこい-The same as previous, but with extra palette edit mode.
たくりんは おんかくか ききたいと ないてるし-Sound test with pictures. Each melody assigned to according game picture and have name in Japanese.
さりゆくも のたちきら めくひとみ そらのはて-The same as previous.

Jikuu Yuuden - Debias

(UNI) Secret passwords:
ふりきちすとoけoつぬつらえもすはひりはへoよくすはひりむけつ゛-Debug Mode.

Kaettekita! Gunjin Shougi - Nanya Sore!

(FIX) Secret passwords:
おんかく-Sound test
すしくいねなんやそれ-A secret map.
Source: ReyVGM

Kame no Ongaeshi - Urashima Densetsu, Xexyz

(FIX) Secret passwords:
E3D3D 3D3DF-Start at Area 12-4 (the final boss) with best weapon power and type and 50 balls.
A2A4A 6A8A0-Play even levels only (flight type with bosses) up to 10, then play levels 11 and 12 in regular way. Start with no weapons and 50 balls. This password is unlockable in the US version.
BBA13 57912-Play odd levels bosses only. Start with best weapon, but minimum weapon power and 50 balls. This password is unlockable in the US version.
**135 79BD*-Start at Area 12-4 (the final boss) with best weapon power and type, 800 balls and invulnerability. Note, doesn't enter any letters in positions denoted with *, use B to skip to the third letter.

Keroppi to Keroriinu no Splash Bomb!

(UNI) Secret passwords:
さうんと゛をきく-Sound test
らすとた゛けみる-Ending Sequence
れいくんけ゛えむ-Rei-kun Game. Hold any of following buttons or its combinations on controller 2: A or B or Up or Left, before entering this password to enable some kind of paper-scissors-rock mini-game.

Kick Master

(UNI) Secret passwords:
K!N!!! L!BB!?-Debug room
L!W!!G !M!N!?-Enable player's level selecting. Just press B at Spell selecting screen.

Krusty's Fun House

(FIX) Secret passwords:
GSSMELLS-Changes enemies on the levels to the big mouses.

Layla

(UNI) Secret passwords:
Password-Pistol|Machine
Gun
|Grenade|Flame
Thrower
|Axe|Grenade
Launcher
|Knife|Shield|?|Speed|Level|Keys|Iris
ONOMATSUNONAKAJIMA-10|100|50|50|50|50|50|50|5|5|||no
AHK0TINAMS1RIALYAL-10|||||||||1|||no
MANTOINUMONKUNEKOO-1|||||||||1|7||no
147147147147147147-1||147||147||147|||1||1, 4, 7|no
KAKUSHIKOMANDODAZO-2|||||||||2|3||no
NUKENINHAVOLGUARD2-1|||||200||||9||1-4|no
OPUSYONHAIRISDESU0-1|||||||||1|||yes
CAKEICERINGOKOHRII-1|||||||||1||1-7|no
MUTEKIKAMOSHIRENAI-1|||||||255||1|||no
0123456789ABCDEFGQ-3|30|5|200|20|100|15|2||5|2||no
MAHOUTUKAISARINANO-1||||||||255|1|||no
IRUKIBOMOTIHONODNI-1|||||||||1|||no

Little Ninja Brothers, Super Chinese 2 - Dragon Kid

(FIX) Secret passwords:
US|Japan-Effect
SOUND|きいてくれよ-Sound test
FULL|ふるそうび-Full equip at start
ENDING|さいご-Ending sequence

Little Samson, Seirei Densetsu Lickle

(FIX) Secret passwords:
The *BUG PASSWORD* means this password doesn't meant to be existed even as a secret. The code at this position is actually dummied out with $FF, and shouldn't be valid. But the password test program always take lover 5 bits of the byte and treat it as a symbol number, where $1F is "5". There are more dummied out passwords in the table, but the first one preventing others from triggering.
US|Japan-Effect
?2KC|4WHB-Stage 1: Ruins (Easy)
7XGN|1SEK-Stage 1: Ruins (Normal)
BN&S|AK5O-Stage 2: Sky (Easy)
KK7B|HH1A-Stage 2: Sky (Normal)
BCWR|ABRN-Stage 3: Waterfall (Easy)
V5?3|QZ4X-Stage 3: Waterfall (Normal)
5JSQ|ZGOM-Stage 4a: Mushroom Cave (Easy)
XSRR|SONN-Stage 4a: Mushroom Cave (Normal)
NS6K|KO0H-Stage 5: Forest (Easy)
ZW4&|TRY5-Stage 5: Forest (Normal)
4RD7|YNC1-Stage 6: Swamp (Easy)
FWWF|DRRD-Stage 6: Swamp (Normal)
1NWB|VKRA-Stage 7: Bubble Cave (Easy)
3MTT|XJPP-Stage 7: Bubble Cave (Normal)
PHC&|LFB5-Stage 8: Mountain Base (Easy)
XBQQ|SAMM-Stage 8: Mountain Base (Normal)
VM84|QJ2Y-Stage 9: Ice Palace (Easy)
D6HL|C0FI-Stage 9: Ice Palace (Normal)
QLXZ|BITP-Stage 10: Temple (Easy)
?2FK|ERIF-Stage 10: Temple (Normal)
CLZT|MIST-Stage 11: Volcano (Easy)
GWLH|4WDH-Stage 11: Volcano (Normal)
J62?|G0W4-Stage 12: Dark Mountain (Easy)
C92K|B3WH-Stage 12: Dark Mountain (Normal)
DP03|CLUX-Stage 13: North Castle (Easy)
GPLH|ELIF-Stage 13: North Castle (Normal)
$$$$|5555-Stage 14: Floating Castle part 1 (Easy) *BUG PASSWORD*
JR6P|GN0L-Stage 14: Floating Castle part 1 (Normal)
BN7Z|AK1T-Stage 15: Floating Castle part 2 (Normal)
0ZZ6|UTT0-Stage 16: Floating Castle part 3 (Normal)
?9MW|43JR-Stage 17: Floating Castle part 4 (Normal)
40N6|YUK0-Stage 13 Boss + max health & potions (Easy)
8NBX|2KAS-Stage 13 Boss + max health & potions (Normal)
N0QB|KUMA-Stage 16 Boss + max health & potions (Normal)
40N7|YUK1-Stage 1: Ruins + max health & potions (Easy)
K7W6|H1R0-Stage 1: Ruins + max health & potions (Normal)
NB50|KAZU-Music room

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.

Low G Man

(FIX) Secret passwords:
A complete list of the secret and generic passwords.
matt-1st Quest Level 1-2
hnry-1st Quest Level 1-3
mich-1st Quest Level 2-1
danm-1st Quest Level 2-2
jimg-1st Quest Level 2-3
elle-1st Quest Level 3-1
malz-1st Quest Level 3-2
hisa-1st Quest Level 3-3
etsu-1st Quest Level 3-4
isac-1st Quest Level 4-1
kuni-1st Quest Level 4-2
kawa-1st Quest Level 4-3
bill-1st Quest Level 5-1
ishi-1st Quest Level 5-2
aman-Extra Level 1-0
ino♥-1st Bonus Level 6-0
shio-2nd Bonus Level 6-0
naka-Extra Level 3-0
gata-3rd Bonus Level 6-0
kid♥-1st Quest Ending
teru-2nd Quest Level 1-1A
mie♥-2nd Quest Level 2-1A
kado-2nd Quest Level 3-1A
same-2nd Quest Level 4-1A
irie-2nd Quest Level 5-1A
maru-3rd Quest Level 1-1B
sima-3rd Quest Level 2-1B
higu-3rd Quest Level 3-1B
ogaw-3rd Quest Level 4-1B
iizu-3rd Quest Level 5-1B
shot-Full Weapons and Ammo
lobb-Extra 9 Lives
song-Sound Test
say♥-2nd Quest Ending
yes♥-3rd Quest Ending

Mad Max

(FIX) Secret passwords:
MMAX-Start at Arena 1
WAST-Begin Road war 2
BLAS-Start at Arena 2
MAEL-Begin Road war 3
HUMU-Start at Arena 3

Magnum Kiki Ippatsu - Empire City - 1931

(UNI) Secret passwords:
8E3B, A57D-Level select and invincibility. Select "CONTINUE" option, enter the first password, press Start, repeat with second password. Now, at the main menu, press A to increase level number up to 5, press B to increase sublevel number up to 8, press Start at the "START" option to begin game from selected level with invincibility.

Mahou no Princess Minky Momo - Remember Dream

(UNI) Secret passwords:
おねかいーきいて♥-Start a new game with all minigames enabled at the Game Center, including the final boss minigame, which is normally can't be accesible there and replaces the Fortune Teller minigame.

Maniac Mansion (Japan)

(UNI) Secret passwords:
おわりをみたい
おわりをみたい
おわりをみたい
-Ending sequence
しらとまなふ-"mattakuu" message
おわひ-"password ga nagaku de sumimasen" message
RESET-Reset NES system
せたかやくようか-"JALECO" message
JALECO-"jibun no tikara de tokou ne" message
よいおとかかたいなあ-Sound test

Meimon! Dai San Yakyuu Bu

(UNI) Secret passwords:
みたいみ たいおわ りみたい-View Ending Sequence

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

Metal Slader Glory

(UNI) Secret passwords:
でばっぐ やろう★-Debug Mode
えりな もう おきなよ-Ending sequence
Source: Pennywise

Metroid

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

Michael Andretti's World Grand Prix, Nakajima Satoru - F-1 Hero

Japanese version:

(UNI) Secret passwords:
さとる*MN-M represents the Level number with letters あいうえおらりるれ (levels from 1 to 9).
N represents the round number. Each level have it's own maximum number or rounds.
Level 1 - 4 rounds, level 2 - 5, 3 - 6, 4 - 7, 5 - 8, 6 - 10, 7 - 12, 8 - 14, 9 - 16. So you can enter any of letters あいうえおらりるれろかきくけこや representing the allowed numbers from 1 to 16 accordingly.
For Example, password "さとる*れろ" will lead you to level 9 round 10. Unfortunately, level 9, round 16 password crashes the game.

US version:

(UNI) Secret passwords:
SAMMY*IJ-I represents the Level number with letters from A to I (levels from 1 to 9).
J represents the round number. Each level have it's own maximum number or rounds.
Level 1 - 4 rounds, level 2 - 5, 3 - 6, 4 - 7, 5 - 8, 6 - 10, 7 - 12, 8 - 14, 9 - 16. So you can enter any of letters A to P representing the allowed numbers from 1 to 16 accordingly.
For Example, password "SAMMY*IJ" will lead you to level 9 round 10. Unfortunately, level 9, round 16 password crashes the game.

Mike Tyson's Punch-Out!!, Punch-Out!!

All versions:

(FIX) Secret passwords:
075-541-6113-"Busy signal".
800-422-2602-"Busy signal" of Nintendo's customer service phone number.
206-882-2040-"Busy signal".

English versions:

(FIX) Secret passwords:
135-792-4680-"Another World Circuit" access. To enable this password hold Select and press A + B when you entered it.
106-113-0120-"Credits". To enable this password hold Select and press A + B when you entered it.
007-373-5963-"Dream Fight" with Mike Tyson.

Mission Impossible

All versions:

(UNI) Secret passwords:
LRHN-Level 1
KMVW-Level 2
XDGJ-Level 3
QBYZ-Level 4
HMPR-Level 5
TVJL-Level 6
YGKX-Computer level. To enable this password, hold Up + A + B on controller 2, then press A on controller 1. In other case, it won't be accepted.
MTKN-Computer password. Can be accepted only in the Computer level at the end of the game. This password will be given to you during the game.

Momotarou Densetsu

(UNI) Secret passwords:
すべてのきよくがききたいな-Sound test
すべてのてきがみたいな-Picture test

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.

Motocross Champion

(UNI) Secret passwords:
あまのんははら-Ending sequence
いいたんたこす-Game over sequence

Nakajima Satoru - F-1 Hero 2

(UNI) Secret passwords:
さとる*MN-M represent the Level number with letters あいうえおらりるれ (levels from 1 to 9).
N represents the round number. Each level have it's own maximum number or rounds.
Level 1 - 4 rounds, level 2 - 5, 3 - 6, 4 - 7, 5 - 8, 6 - 10, 7 - 12, 8 - 14, 9 - 16. So you can enter any of letters あいうえおらりるれろかきくけこや representing the allowed numbers from 1 to 16 accordingly.
For Example, password "さとる*れろ" will lead you to level 9 round 10. Unfortunately, level 9, round 16 password crashes the game.

New York Nyankies, Rockin' Kats

(UNI) Secret passwords:
US|Japan-Effect
F♊GHTB♋SS_|たたかえてきたおせ_-Boss fight. Insert a number 1 to 5 instead of "_" to select one of the 5 game bosses, excluding the last one.
♉ND♊NG5♥♥♥|みせておくれみせて5-Ending sequence.
M♈PH♈RDM♈P|きついねこれきついね-Final Level 6 and Last Boss fight.
P♋W♉R★♌P!!|くれアイテムくれくれ-All items.
G♉T!M♋N♉Y$|ほしいおかねくれくれ-Extra 5000 money.
K♈TS50K♈TS|ねこ50ねこ50ねこ-Extra 50 lives.

Parallel World

(UNI) Secret passwords:
All numbers are correspond to the certain tiles with patterns on the password screen. A blank tile (without pattern) is a number 0. Each number means how much times you should press A to reach the desired pattern.
5 1 1 6
9 1 1 7
2 0 0 2
3 0 0 3
-Sound test
5 1 1 6
2 5 6 2
2 0 2 2
4 1 3 2
-Ending sequence
5 6 5 6
4 0 0 3
5 0 0 6
4 3 4 3
-Unlimited lives

Parasol Henbee

(UNI) Secret passwords:
えあわせ-Boss Minigame 1
すもうき-Boss Minigame 2
すもうし-Boss Minigame 3
むてきさ-Invulnerability
としひこ-Game over message
もとひろ-Game over message
しんんん-Game over message

Puzznic

(UNI) Secret passwords:
FCPZ-"PUZZNIC" mode Stage select
ZZ1C-"GRAVNIC" mode Stage select

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

Rocketeer, The

(UNI) Secret passwords:
Enter any of this passwords at the Password screen, then start a new game.
169-963-491-During the game press Select + Start to skip current level. Hold A, then press Select + Start to restore health, fuel and ammo for all weapons.
000-000-047-Enables the Cutscene Debug mode. Every frame of animation or message at the cutscenes now will wait for the A button press or hold to continue.

Scarabeus (Prototype)

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

Shufflepuck Cafe

(UNI) Secret passwords:
You must point and click on the "CHAMPION" label at the main game screen. Select the password option, then enter the following code. There is no correct password confirmation, password is treated as wrong one with the same sound. But there is internal flag toggles. If you enter this code one more time, flag will be toggled back. Now press B to exit the password mode and select any opponent.
326075-No loss game

Silver Surfer

(FIX) Secret passwords:
At the title screen, press Up on both controllers to display the password screen.
FPNFR7-Possessor Section 1
9KY3FG-Possessor Section 2
GDXK4F-Possessor Section 3
2SKSKQ-Emperor Section 1
B73MSK-Emperor Section 2
PL3ZZ5-Emperor Section 3
MJXT8H-Reptyl Section 1
J3PS67-Reptyl Section 2
RNHWDF-Reptyl Section 3
5QRXD6-Mephisto Section 1
CMN17D-Mephisto Section 2
TGQ2JT-Mephisto Section 3
NSLWDF-Firelord Section 1
LNQ283-Firelord Section 2
1X1ZTS-Firelord Section 3
JMDFWK-Magik Domain Section 1
H6N7D4-Magik Domain Section 2
WVL3R9-Magik Domain Section 3
KJTTJK-Invulnerability
CKWJT4-Full weapons
KCHDR4-Second quest (Unlockable)
S4FHFB-Third quest (Unlockable)
68VKG9-8 continues
J8SCL9-6 continues
SJM333-Unlimited continues

Smurfs, The

(UNI) Secret passwords:
Enter one of the following passwords to start from a desired level.
YJPB-Act 1
YJPC-Act 2
YJPD-Act 3
YJPF-Boss 1
YJPG-Act 4
YJPH-Act 5
YJPJ-Act 6
YJPK-Act 7
YJPL-Boss 2
YJPM-Act 8
YJPN-Act 9
YJPP-Act 10
YJPQ-Boss 3
YJPR-Bonus Mushrooms 1
YJPS-Bonus Mushrooms 2
YJPT-Bonus Mushrooms 3
YJPV-Bonus Bubbles 1
YJPW-Bonus Bubbles 2
YJPX-Bonus Bubbles 3

Stanley - The Search for Dr. Livingston

(UNI) Secret passwords:
During the game press Select, then enter the following password:
BCKPQRLC-Ending sequence

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.

Super Chinese 3

(UNI) Secret passwords:
あいう-Music test
かきく-Start with maximum Level and Power
さしす-Credits
たちつ-Start with maximum Level and Power (another code)
ぱぴぷ-Movie test
なにぬ-Message test

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

Tatakae!! Rahmen Man - Sakuretsu Choujin 102 Gei

(UNI) Secret passwords:
とおる-Continue?
ひろゆき-Continue?
かみや-Continue?
まにわ-Continue?

Tenkaichi Bushi - Keru Naguuru

(FIX) Secret passwords:
とおますないと-Credits
ちず-See the world map
Source: ReyVGM

Titan

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

Toukon Club

(UNI) Secret passwords:
3708-4871-Training mode.

Tokyo Pachi Slot Adventure

(UNI) Secret passwords:
のすけはねている-Continue from previously played game if you don't press Reset.

Toxic Crusaders

(FIX) Secret passwords:
There are 4 different possible passwords for each level selected randomly, but with two exceptions, the game doesn't tell you the passwords for levels 1 and 6. However, the passwords for these two levels are exists and there are only two for each, other two are filled with wrong character and cannot be used in random password generation at the end of the level, so this four passwords render secret for sure.
7969, 1061-Level 1
7871, 3276, 9562, 2258-Level 2
4092, 5401, 7525, 0263-Level 3
6971, 5080, 8956, 3815-Level 4
7011, 4843, 8698, 8248-Level 5
6154, 9182-Level 6

Treasure Master

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

Venus Senki

(UNI) Secret passwords:
はるぼういち-Stage 1
はるぼうに-Stage 2
はるぼうさ-Stage 3
はるぼうし-Stage 4
はるぼうご-Stage 5
はるぼうろ-Stage 6
はるぼうなな-Stage 7
はるぼうはち-Stage 8
はるぼうく-Stage 9
はるぼういちまる-Stage 10
はるぼういちいち-Stage 11
はるぼういちに-Stage 12
はるぼういちさ-Stage 13
はるぼういちし-Stage 14
はるぼういちご-Stage 15

Who Framed Roger Rabbit

(UNI) Secret passwords:
Enter this phrase as a password, before entering the last letter with A, hold Down + Select to complete the code.
ROGERTHE RABBIT ANDEDDIE-Extra 6 lives.

Zoids Mokushiroku

(UNI) Secret passwords:
Note: nigori or panigori symbols need to be entered separately from the kana symbols, like for ゴ you should enter コ and then ". So Each password contains 16 symbols in total.
キングゴジュラスカイタイナ-Secret map
パスワドニハギルベイダ-Secret map

 

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