Mostly Unpublished NES Cheats ;)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.
NARC
NES Play Action Football
Nagagutsu wo Haita Neko - Sekai Isshuu 80 Nichi Daibouken, Puss 'n Boots - Pero's Great Adventure
Nakajima Satoru - F-1 Hero 2
Nakayoshi to Issho
Namco Classic II
Namcot Mahjong 3 - Mahjong Tengoku
Nangoku Shirei!! - Spy Vs Spy
Nantettatte!! Baseball
Napoleon Senki
Napoleon's War (Waixing)
Navy Blue
Ne Zha Chuan Qi (Nanjing, NJ036)
Nekketsu Kakutou Densetsu
Nekketsu Kouha - Kunio-kun, Renegade
Nekketsu Koukou Dodgeball Bu - Soccer Hen, Nintendo World Cup
Nekketsu! Street Basket - Ganbare Dunk Heroes
New Ghostbusters II
New York Nyankies, Rockin' Kats
Nichibutsu Mahjong 3 - Mahjong G Men
Nigel Mansell's World Championship Challenge
Nightshade
Nihonichi no Mei Kantoku
Ninja Cop Saizou, Wrath of the Black Manta
Ninja Crusaders - Ryuuga, Ninja Crusaders
Ninja Gaiden, Ninja Ryukenden, Shadow Warriors
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
Ninja Jajamaru - Ginga Daisakusen, Squashed (Prototype)
Ninja-kun - Ashura no Shou
Ninjara Hoi!
Nintendo World Championships 1990
Noah's Ark
Nobunaga no Yabou - Sengoku Gunyuu Den, Nobunaga's Ambition 2
North & South
Nuts & Milk
Cheats summary:
| generic cheats | - | 9 |
| unique cheats | - | 33 |
| buried secrets | - | 23 |
| fixed generic cheats | - | 8 |
| unverified games | - | 0 |
| games with secrets | - | 36 |
| games with no secrets found | - | 16 |
NARC
(FIX) Continue:
At the title screen, hold Up + A + B + Select + Start. When all lives are used, a countdown timer will appear instead of the game over message. Press Start to continue game play from the current location. To disable this cheat, when returned to the title screen press Up + A + B + Start.
NES Play Action Football
(BUR) GameGenie (added 09.12.13):
| AENNONNY | - | Re-enables a simple debug feature, which is disables all collision detection with the player 1, so enemies couldn't to stop you while you running on the field. Unfortunately, this doesn't affect CPU AI itself, so you still couldn't win round easily. |
Nagagutsu wo Haita Neko - Sekai Isshuu 80 Nichi Daibouken, Puss 'n Boots - Pero's Great Adventure
All versions:
(BUR) Hidden text (added 02.01.09):
The RESET routine in both regional versions uses similar strings
Masahiroor
MASAHIROto check if game was soft or hard reset.
Japanese version:
(UNI) Player 2 reverse controls (added 11.07.14):
At the title screen, shout to the microphone on controller 2 10 times, then hold Down + Left + A + B on controller 2 and press Start on controller 1. Start a two players game. If done right, the second player's movement controls will be reversed. This strange cheat is exactly the same as in another game by the same developer: "Hokuto no Ken".
(BUR) Hidden text (added 07.07.09):
There is some hidden copyright text inside CHR ROM:
Program and Audiovisual Copyright 10/01/86 Shouei System Programmed by Masahiro. "ACTOR".Yoshihara Yasuhide.Sakakura Pictured byKenichi."RINA".S uzuki Makoto."TIYA TIYA PIRAYASHIMUN".Higa Naomi."PUTTSUN".Satoh Music by Kaori."LIONS".Aoki Ochakumi by Kyouko."MADONNA".Yoshin o Mie."UMBRELLA".Takanoand at the end of the copyright message there is another one:
WATASHITACHINI AI WO KUDASAI .. COPY SURUNA ! Kono kurou wo wakattene !which means "PLEASE, LOVE US, DO NOT COPY! Try to be in our shoes!".
US version:
(BUR) GameGenie (added 11.07.14):
| GAUGIZAA | - | Re-enables the Stage skip cheat. During the game press Select to skip to the next level. |
Nakajima Satoru - F-1 Hero 2
(UNI) Secret passwords (added 09.12.13):
| 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. |
Nakayoshi to Issho
(BUR) GameGenie (added 09.12.13):
| PESNNYAA | - | Re-enables a lot of debug features. First of all, hold Start and press Reset to enable a Sound test. Hold Up and press Reset to enable a Room test. Hold Down and press Reset to enable a Message test. Hold Left and press Reset to enable a Battle test. At the title screen, hold Left then press A to enable fast movement. One more title screen cheat does nothing, but still functioning: hold B + Select + Start then press A. At the name entry screen hold combination of Start, Select or Up, select "END" option then press A to jump to the corresponding level. Select - Level 1, Start - Level 2, Select + Start - Level 3, Up - Level 4, Up + Select - Level 5, Up + Start - Level 6. |
(BUR) Hidden text (added 09.12.13):
During development a name "Nakayoshi" of the main person was written down to the end of ROM and first letter of this name was used by the debugging code to determine if this is a debug or the final version. To disable debugging functions, this letter should be erased, so we see now in current game version, only:
akayoshiwas left from the name at the end of the game ROM.
Namco Classic II
(UNI) Instant round restart (added 21.07.14):
During the game, in the stand up mode, hold A + B, then press Select to restart current game from the beginning.
Namcot Mahjong 3 - Mahjong Tengoku
(BUR) Hidden text (added 09.12.13):
The RESET routine in this game uses string
BAKAYto check if game was soft or hard reset.
Nangoku Shirei!! - Spy Vs Spy
(FIX) Freeze the computer:
While playing versus the computer. Hold A or B on controller 2 and yell at the microphone on the same controller. If done right, the computer will freeze for a few seconds. If you freeze the opponent on top of a hazard, all his energy will be depleted.
Source: ReyVGM
(UNI) Sound box:
Right before level ends, at least one A and one B on any controller should be held. If done right, sound box will appear. While in "sound box" mode, press A on controller 2 for resetting music and pause.
(UNI) Staff:
While in "sound box" mode hold Right + A + B on controller 2 to switch to "Staff" mode. Just shift cursor to the second page and return it back and you'll see two staff screens.
Nantettatte!! Baseball
(UNI) Credits:
At the title screen, when the message "PUSH START" appears, press Up, Down, Left, Right, Up, Down, Left, Right, B, B, B, A.
(UNI) Soft reset:
During the game, press quickly Start then Select.
(BUR) GameGenie (added 30.11.13):
| XVEAPGAV | - | The version info, hold A after reset to see the version info. |
(BUR) GameGenie:
These features was disabled in final release, but with GameGenie codes you can access each of them by entering cheat code for the Credits.
| ILVULLKO+XLVUGUVZ | - | Tilemap and sprite test |
| XIVULLKP+XLVUGUVZ | - | CHR test |
| IGVULLKP+NZVUGUVX | - | ROM and DROM self-test |
| TTVULLKO+ELVUGUVZ | - | Sound test |
| PGVULLKP+OLVUGUVZ | - | Backup RAM test (clear all SRAM memory) |
| SAVULLKP+EGVUGUVZ | - | Error handler |
Napoleon Senki
(UNI) Sound test:
At the game setup screen, press Left + A + B on controller 2.
Napoleon's War (Waixing)
(BUR) GameGenie (added 22.07.14):
| XVXTTIAV | - | Re-enables the generic type of debug display for many of Waixing's games. Unfortunately, the fonts are removed or doesn't displayed properly, so you can't actually see the number parameters. |
Navy Blue
(UNI) Sound test (added 13.12.07):
After completing the game, at the "Presented by I'MAX" screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Select.
(UNI) Password generator:
Ne Zha Chuan Qi (Nanjing, NJ036)
(UNI) Secret message (added 21.05.14):
During the game, while in conversation mode, hold Up + Select + Start on controller 1 and skip with A to the end of the dialog. The copyrigh string will be displayed in the dialog box, but the proper graphics or text was removed from this version of the game. This cheat can be found in a couple of Nanjing games on the same engine.
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".
(FIX) Special team select:
Enter the "BATTLE MODE" then select the "NO CHARACTER EDIT" mode. At the team member select screen, hold one of the following combinations, then press A to fight with corresponding special team:
| Right + Select | - | Toraji |
| Left + Select | - | Toraichi |
(UNI) Password generator:
Note, you can not set any of the names used in the game by other CPU characters as your name while creation your character. Also that names can not be used in password. But there is one exception: name "くにお" allows you to play as Kunio itself. He have 5th unique blood type.
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 |
Nekketsu Koukou Dodgeball Bu - Soccer Hen, Nintendo World Cup
(BUR) GameGenie (added 20.06.08):
There is some common feature in some Technos games like "SAMPLE VERSION" flag, allowing you to have some extra or debug features in game. Depending var is at $FFF6 address and uses some bits set to enable hidden features.
| PENYVYAA | - | Bit 0. Enables B/W screen mode. |
| AKNYVYAA | - | Bit 6. You can pause any text sequence in game by pressing B on controller 2 at any script movie. |
| EKNYVYAA | - | Bit 7. Enables "SAMPLE VERSION" mode. In this mode some debug features available: You can select the game stage by pressing A on controller 2 at the level number screen. You can select any enemy team screen at the "timeout" screen by pressing A on controller 2. In game hold on controller 1 Select then press on controller 1 A to win current match, or press B to get timeout, or press Up to loose. In game hold on controller 1 Select then press on controller 2 one of these buttons: A, B, Right, Left when ball near of yours or the enemy's gates to get the control of the goalkeeper or sort of. ;) |
Nekketsu! Street Basket - Ganbare Dunk Heroes
(UNI) Password generator (added 15.02.16):
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. |
(UNI) All items (added 23.07.14):
During the game, press Select to enter the items menu. Hold Down + A + B on controller 2, press Start or A on controller 1 to exit this menu. A sound will confirm correct code entry.
(UNI) Debug leftovers (added 23.07.14):
Enter the Bonus Games TV channel at the main game menu, then choose to play Roulette minigame (const $50). While roulette is start spinning, but before the progress bar on the right gets filled, hold Up + Left + A + B + Select on controller 1. This causes roulette to stop always on number 8. Regardless of prize is set to this sector or not, you will be thrown away with no bonus. The jump animation for this case is very odd, so it can be suggested this is an animation debug leftovers, since there are no profit for using this cheat.
(UNI) Secret passwords (added 07.01.08):
| US | | | Japan | - | Effect |
| F♊GHTB♋SS_ | | | たたかえてきたおせ_ | - | Boss fight. Insert a number 1 to 5 instead of "_" to select one of the 5 game bosses, excluding the last one. |
| ♉ND♊NG5♥♥♥ | | | みせておくれみせて５ | - | Ending sequence. |
| M♈PH♈RDM♈P | | | きついねこれきついね | - | Final Level 6 and Last Boss fight. |
| P♋W♉R★♌P!! | | | くれアイテムくれくれ | - | All items. |
| G♉T!M♋N♉Y$ | | | 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. |
Nichibutsu Mahjong 3 - Mahjong G Men
(FIX) Nichibutsu mode (added ReyVGM):
At the game mode selection screen, hold B and you can select the fourth game mode, "Nichibutsu". Don't release the B until press A.
Nigel Mansell's World Championship Challenge
All versions:
(BUR) GameGenie (added 10.12.13):
Both the US and the European versions contains a full set of text resources for 5 languages. However, you can select a language in the European version only after the title screen, but the title screen itself is always in english in both regional versions. Surprisingly, the title screen and the copyright logo screens are have it's own language resources, and you can select them by using one of following GameCodes in any regional version of this game. For the US version this also enables the whole locked language set for the rest of the game, although for the European version you can change it after the title screen.
| PEUGPAAA | - | Enables French title screen and logo |
| ZEUGPAAA | - | Enables German title screen and logo |
| LEUGPAAA | - | Enables Italian title screen and logo |
| GEUGPAAA | - | Enables Spanish title screen and logo |
US version:
(BUR) GameGenie (added 10.12.13):
| TPOZPSTA | - | Re-enables the Language select screen for the US version. Note, that the language resources are full of bugs and partially in english, so assuming this resources an early version of the final release resources. |
Nightshade
(UNI) Soft reset (added 17.04.10):
Press Up + Down + Left + Right + A + B + Select + Start.
Nihonichi no Mei Kantoku
(UNI) Secret names (added 10.12.13):
Enter one of the following words as a player name.
| きんたろう | - | By default, the starting player parameters are 450/450/500/500, with some additional bonus points not less than 100. If you enter your name with all the same characters (if you do not care much about the game), then your additional bonus points will be always 40, so you need enter at least one or two different symbols in your name. But if you enter this secret name, you'll start with all parameters set to 998, however with just 1 bonus point. |
| あるふぉんす | - | Debug mode. During the game your opponents have only 4 different non-random deliveries, cycling, you can skip any catch/delivery by pressing B + Select. Enter the ingame menu by pressing A, select top option, hold Select then press A to bring up the debug menu, where you can select memory/stats/data viewer or warp to the next round. Enter a new tournament, at the game setup menu, select second option, hold Select then press A to enable the auto game option. |
| おふし゛やん | - | Doing something with stats after a winning round. Purpose isn't clear. |
| とーいす゛ | - | Doing something with stats after a winning round the same way, but at different side. Purpose isn't clear. |
Ninja Cop Saizou, Wrath of the Black Manta
Japanese version:
(UNI) Invulnerability:
Before the title screen, press B, B, Select, A, Up, Select, Right, Start. A "MUTEKI" message will appear at the bottom part of the screen.
(FIX) Stage select and Boss rush (added 17.01.14):
At the title screen, press one of the following button codes to begin from the desired stage.
| Down, Up, Down, Up, B, A, Down, B, Start | - | Stage 1 |
| A, B, A, A, A, Up, Down, B, Start | - | Stage 2 |
| Select, A, B, B, A, Select, Down, Up, Start | - | Stage 3 |
| Right, Right, Down, Down, Up, Up, B, Select, Start | - | Stage 4 |
| Down, Right, Left, B, A, B, Select, Select, Start | - | Stage 5 |
| Up, Left, Left, Right, B, Select, A, Select, Start | - | Stage 6 |
| A, B, A, Select, Select, Select, Right, Up, Start | - | Boss Rush |
US version:
(BUR) GameGenie (added 05.03.14):
| ZGSNAUOE+OYSNPLUN (for the US version PRG1) EEENTXNL+ENENYZXN (for the US version PRG0) ONEUOXXU+AKEUEZKU (for the European version) | - | Re-enables the debug stage/boss select mode. Just press Start at the title screen. Press A or B to select a level number. A numbers from 1 to 6 represents the regular levels, numbers from 81 to 86 - the boss levels. Press Select to start with invincibility, press Start to start the regular game. |
Ninja Crusaders - Ryuuga, Ninja Crusaders
(BUR) GameGenie (added 10.12.13):
| GANNUSGK | - | Re-enables the invulnerability cheat. Pause the game, press A to enable invulnerability, press B to disable it again any time. |
(BUR) Hidden text (added 10.12.13):
Unused date sting is present at the end of the ROM:
R O23 MAY 1990
Ninja Gaiden, Ninja Ryukenden, Shadow Warriors
(FIX) Sound test:
Either at Tecmo logo or at the game intro, hold Down + Left + A + B + Select, then press Start.
(BUR) GameGenie (added 25.07.14):
| AZUTYSXT+OTUVASXV+EGUVPSXT (for the US version) AZXTGSXT+EGXTTSXT+OTXTISXV (for the Japanese version) AXKTYKGZ+OVKVAKNN+EKKVPKNY (for the European version) | - | Re-enables the old Stage select and Sound test mode. The Stage select will appear after the Act number screen. Hold A and press Left or Right to change the stage number. Press Start to start. To enable the sound test, at the Act number screen hold Up + A + B and press Start. Use the same controls to play music and sounds as for the Stage select. To exit the Sound test, play music index 00. In the european version due to general code changes, you couldn't see actual text, but the code is still working. |
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.
(BUR) GameGenie (added 28.07.14):
| AZUGVSGZ+GLUGNSNY+KIUKESNN (for the US version) AZUKKSGZ+PLUKSSNY+KIUKVSNN (for the European version) | - | Re-enables the Stage select mode. The number will appears after the Act number screen. Hold A and press Left or Right to change the starting level. Press Start to start from selected level. This code is still present in the Japanese version, but can't be restored easily. |
| SXVTGXGZ+NUVTIXNN+PKVTTXNN+ EEVTYXGZ+SEVVAXNY+NUVVPXNN (for the US version) OKSVIXGK+AXSVTZNT+ESSVYZXT (for the European version) | - | Re-enables the invulnerability cheat. Pause the game, press Select to toggle invulnerability on and off. This cheat can be restored only in western versions, but the invulnerability flag ($00BF) is still can be enabled by setting value $80 in the Japanese version. |
European version:
(UNI) Sound tests (added 28.07.14):
The Sound test cheat is the same as in all NTSC versions, but the button code to enable it is different. You must press Down + Left + A + B + Select, instead of Up + Left + A + B + Select to enable any of three Sound tests.
Japanese version:
(UNI) Ending easter (added 28.07.14):
After beating this game and when the final credits is over. At the "THE END" screen, press Right + B + Select. An extra ending sequence will be displayed with the final messages from the two final bosses. This easter were completely removed from western versions.
Ninja Gaiden 3 - The Ancient Ship of Doom, Ninja Ryukenden III - Yomi no Hakobune
All versions:
(BUR) GameGenie (added 03.07.08):
| ENNNOYAY | - | No cutscenes mode. |
| AENNOYAY | - | Re-enables debug mode. After reset you will be able to listen to the music and the sounds. Hold A then press Up or Down to change low digits of sound number, hold B then press Up or Down to change hi digits of sound number, press Select to play selected sound, press Start to start game from level with the corresponding number and invulnerability cheat enabled. To toggle invincibility during the game on and off, press Start then Select. |
US version:
(UNI) Extra 99 continue (added 07.01.08):
Wait until the title screen fades out then press Start, repeat this 8 times, then hold Up + Left + A + B + Select and press Start.
(BUR) GameGenie (added 13.03.16):
| AENLSVNY | - | Re-enables the extra ending message, disabled in the US version. |
Japanese version:
(GEN) Extra credits (added 13.03.16):
After beating the game, at the "The End" screen, wait 18 minutes to see the extra hidden message "TO BE CONTINUED".
Source: tcrf.net
Ninja Jajamaru - Ginga Daisakusen, Squashed (Prototype)
Japanese release version:
(UNI) Sound test (added 28.07.14):
At the title screen, press A, Up, Down, B, Left, Right, Up, Up on controller 2.
(UNI) Stage select (added 28.07.14):
At the title screen, press Up, Down, Left, B, A, A, Up, Right on controller 2. Select the stage number, press Start to begin a new game from the selected stage.
Japanese beta version:
(UNI) Sound test (added 28.07.14):
At the title screen, press A, A, B, B on controller 2.
(UNI) Ending sequence (added 28.07.14):
At the title screen, press B on controller 1.
(BUR) Unfinished stage select (added 28.07.14):
At the title screen, press B, B, A, A on controller 2. A select stage number screen will appears, you can select any number, but can't play from it.
All versions:
(UNI) Intro easter (added 28.07.14):
At Jaleco logo screen, before the title screen, hold A on controller 2 to stop the Jaleco logo from moving down and stand still on the screen.
(BUR) GameGenie (added 27.03.12):
| NNNYEYAE | - | Re-enables the debug display. After entering this code, part of game HUD with scores will be replaced with 12 huge digits plus 2 small digits in the middle. Digits displays various variables or game flags in real time. |
Ninja-kun - Ashura no Shou
(UNI) Freeze hi-score:
At the title screen, press A, B, A, B, B, A, B, A.
Ninjara Hoi!
(UNI) SRAM clear (added 11.12.13):
Hold Select + Start then press Reset. The SRAM save data will be erased.
Nintendo World Championships 1990
(UNI) Timer test (added 28.07.14):
At the title screen, on controller 2, hold A, then press Select.
(UNI) Skip Super Mario Bros (added 28.07.14):
At the title screen, on controller 2, hold B, then press Select. This allows you to start right from the Rad Racer game, so you can spend more time for this game and Tetris and finally get more points, but at the results screen the SMB results will be all zero.
Noah's Ark
(UNI) Cheat mode (added 11.12.13):
At the title screen, press Up, Left, Left, A, Down. A small number will appear at the middle of the screen. Press Select to change it from 0 to 6, press Start to start from level with corresponding number. Press Select + Start during the game to skip current level. Also you'll get unlimited lives.
(BUR) Hidden text (added 01.03.15):
The RESET routine in this game uses string
JASONBASINto check if game was soft or hard reset.
Source: tcrf.net
Nobunaga no Yabou - Sengoku Gunyuu Den, Nobunaga's Ambition 2
(GEN) Sound test and Samurai & Ronin slideshow (added 22.02.10):
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.
North & South
Japanese version:
(FIX) Sound test:
At the "KEMCO presents" screen any time, press Up, Up, Down, Down, Left, Right, Left, Right, B, A.
US version:
(FIX) Sound test:
At the "KEMCO presents" screen, when the text displaying is over, press Up, Up, Down, Down, Left, Right, Left, Right, B, A.
Nuts & Milk
(UNI) Secret message (added 24.04.07):
Start a new game, press Start to pause it, then hold Right + B on controller 2 and Left + A + B + Select on controller 1, then press Start. "VERSION 1 1984 05 29 BY KIKU" appears. "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."