nensondubois' codes

[nensondubois]

Qix.gb

Select game over cutscene
01??C2DF

00 - Null
01, 02 - Mexico
03 - Africa
04 - Spain
05 - India
06 - China
07 - England
08-FF - Congratulations!

[nensondubois]

Harvest Moon (SGB, US, J)

Start in Debug Menu (The Japanese offers more options and text is was not translated in the US version, but the code still enables the debug menu in all versions)
001-E3F-6EA

Start at Ending
211-E3F-6EA

Enable additional Japanese debug items
1FF-819-E66

Harvest Moon (GBC)

Start in Debug Menu (The Japanese offers more options and text is was not translated in the US version, but the code still enables the debug menu in all versions)
002-03F-6EA

Start at Ending
211-E3F-6EA

Enable additional Japanese debug items
1FF-759-E66

Harvest Moon 2

Start in Debug Menu
0F1-7AF-E6A

Harvest Moon 3

Start in Debug Menu
012-96F-3B2

[nensondubois]

SolarStriker (world).gb

Start on second quest
FC1-6BF-2A5

Start on second quest stage 2
025-39F-E6E

Start on second quest stage 3
035-39F-E6E

Start on second quest stage 4
045-39F-E6E

Start on second quest stage 5
055-39F-E6E

Start on second quest stage 6
065-39F-E6E

[nensondubois]

SolarStriker (world).gb

Set initial high score to 00000000
001-69F-E62

Set initial high score to 00900000
091-69F-E62

[nensondubois]

Here's a quick code to allow the unused song to play.

Battletoads.nes

Pause Cutscene dialogue (unused song is not cut off; press start to proceed. Use only before cutscene starts. I'm still investigating this mystery and what else I found is that it is not in the standard song ID table, and it appears to be a special flag of sorts related to activating the warp zones.)
VENEZTSA
GAEATNLE

[nensondubois]

Harvest Moon 3.gbc

Enable unused SGB functions
031-46F-E6A

I could have sworn there was an unused palette. I might have to dig into some older notes, if I can find them. If not, I'll have to spend the time at a later date and look into the ROM again. I love setbacks.

EDIT: Can't even find it in my notes. Weird. I guess I'm thinking of a different game. I can't remember everything I found so this is going to take a very long time to post everything, along with not having a lot of time and new codes on the horizon constantly whenever I think of something that I want to look for in a game.

[nensondubois]

Super Mario Bros. 2

Subspace looks normal (There is a graphical oddity you will notice. Nintendo didn't swap all of the tiles.)
XZXPLKOZ

Entering Suspace will drop you into a strange new world (Can get stuck in certain parts of the level upon entering Suspace. Does not affect all parts of the level upon entering Subspace and will remain normal with normal level palette)
GZXPAKSA

Entering Suspace will drop you into a strange new world (Alternate) (Can get stuck in certain parts of the level upon entering Suspace. Does not affect all parts of the level upon entering Subspace and will remain normal with normal level palette)
TIXPAKSA

[nensondubois]

Kaeru no Tame ni Kane wa Naru (For the Frog the Bell Tolls)

Press Start at Title Screen/File Select to change music
??1-9D8-E62

[nensondubois]

I'm thinking about rewriting the entire game engine for GB Toy Story. In the meanwhile here is a few codes that help make the game barely playable.

Music Modifier
010?30DF

00 - Strange Things
02 - You've got a Friend in Me
04 - Playtime

Storyline music modifier
??4-1EF-E6E

00 - Strange Things
02 - You've got a Friend in Me
04 - Playtime

Based on Mark Ortiz's source files he gave me, I'm going to assume 03 would have been the Battle with Buzz song but it is absent from the ROM in both GB and SGB forms. He never explained why it was never included. He never answered how he got the music used in the console versions since the GB and SGB modes obviously used them when porting.

Improve jumping (the jumping physics in this game are terrible. This makes the initial ground jump easier to pull off and slightly less clunky)
001-BEC-C4E

Skip intro screens
EA2-9FF-D5D
EA2-A9F-D5D
EA2-B3F-D5D
EA2-BEF-D5D
EA2-C9F-D5D
EA2-D4F-D5D

[nensondubois]

Universal enable all menu options for all games 
(Switch off the effects after you've entered the menu, allowing you to make any changes including setting the controller scheme for the entirety of your sitting.
This has been tested and works if using an unaltered Game Genie aside from cutting the tabs to allow the Super Game Boy to fit.
Untested but Should work if using the original Super Game Boy BIOS cartridge revisions. Games will still swap palettes back if they change.)
622D-0D0F
6229-6DAD
6228-D7A4
6223-D40F
6238-DFAD

Let me know if this code does not work for the Super Game Boy 1.

[nensondubois]

Load region incompatibility message.

Game Genie
D162-04DD

PAR
0081D806

This message is displayed in the first Japanese revision of the Super Game Boy BIOS when attempting to play the cartridge in a PAL SNES console.

All later Super Game Boy 1 and 2 BIOS revisions at this region error screen. Nintendo probably came to their senses and scrapped regional incompatibility since the Game Boy is regionally compatible with any game. Nintendo also never bothered updating the screen for the Super Game Boy 2 using the rainbow font.

Text for the message can also be found at 0x3F98A

I actually have a really interesting idea for this code.

[nensondubois]

Super Game Boy 2 (not tested with Super Game Boy 1 BIOS revisions. The code doesn't work with the Game Genie though it should. Need to figure out why it only works with my PAR MK3 cartridge. Also need to find my notes on this because there are a few glitches with the unfinished OBJ_TRN mode such as the menus only showing once you hold down B or make a selection. Games do not send CHR and display currently loaded SNES VRAM on the screen.

Enable SNES OBJ_TRN mode

Game Genie
D560-070D

PAR
00814D07

[nensondubois]

Super Mario Bros. 2/Super Mario USA

Can enter first door in 1-1 (The game simply sends you back to the entry point from where the game initially places you because there is no valid warp pointer. Instead of outright hanging the game indefinitely, this is what happens if you were to enter the very first door in the game.)
YXKAPPTI
AKKAZPAP

Mystery solved for those who always wondered where that door leads. I know I did.

[nensondubois]

Lost World Jurassic Park.gb

Access unused cutscenes by pressing Up in cutscene viewer
??6-F2B-A2E

14 - Ending
18 - Unused 2

[nensondubois]

Lost World Jurassic Park.gb

Universal Music Modifier
3E0-96B-7F1
??0-97B-197
01 - Level Theme 1 (Labs)
02 - Level Theme 2 (Caves)
03 - Level Theme 3 (Jungle)
05 - Unused Jingle (Possibly was intended for Game Over screen)
06 - Level Theme 4 (Leaving Island)
07 - Ending