nensondubois' codes

[nensondubois]

Super Mario Bros. (W) [!].nes

Disable Fireball object collision
SUNTTPSP

[nensondubois]

Super Mario Bros. (W) [!].nes

Fireball graphic set modifier (two bytes; msb)
ECF5:??:64

[nensondubois]

Super Mario Bros. (W) [!].nes

Red Koopas don't fall from walking or running off platforms, pipes or blocks
EKVTZASL

[nensondubois]

Super Mario Bros. (W) [!].nes

Enemies walk away from pits
PNNVPEOU

Enemies don't fall from walking or running off platforms, pipes or blocks
GXNVPEOU

[nensondubois]

Super Mario Bros. (W) [!].nes

Pogo-stick Mario and Luigi (You can only move by jumping)
GGVLLLAX

[nensondubois]

Tetris Tengen.nes

Title screen music modifier
9E98:??:09

Title screen palette
9EA2:??:04

[nensondubois]

Super Mario Bros. (W) [!].nes (covers all versions and revisions)

Play unused Game Over variation everywhere
ZPSNALAA
PZSYYUOX

https://twitter.com/nensondubois_/st...74684522983424
https://gamehacking.org/vb/forum/vid...363#post197363

Super Mario Bros. (W) [!].nes (covers all versions and revisions) Play unused Game Over variation everywhere (originally found by @Kode54 in the NSF rip track 12)
ZPSNALAA
PZSYYUOX
If you modify 12 to a different value you can play any song in the game, some of which are invalid data being read off as actual song data (missing, invalid events, segments and or looping information; examples include the infamous "PPPPPP" code variations.) There is complete song information for this unused game over variation.
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[nensondubois]

Kabushiki Doujou (J) [!].nes

Title screen music modifier (Trivia: the title screen song, which is a PD song is used in the Game Boy version of Cadillac, or Square Deal ~ A Game of Two Dimensional Poker. The Famicom version of Cadillac does not have this song, and may have been intentionally reserved for Kabushiki Doujou.)
EBB8:??:03

Game area title screen modifier (No debug screen exist in this game.)
C29A:??:0E

[nensondubois]

Goal! (U) [!].nes

 Title screen music modifier 81C3:??:04

[nensondubois]

Goal! Two (U) [!].nes

 Title screen music modifier 8093:??:1C Music starts at 16

[nensondubois]

Tetris 2 (U) [!].nes

Press Down to descend Tetrad (Pressing A will also cause the Tetrad to descend while rotating anti-clockwise)
SENOPEVS

[nensondubois]

Tetris 2 (U) [!].nes

Drop a Tetrad to clear round (original RAM code by ReyVGM)
NNSUPTZE

[nensondubois]

Tetris 2 (U) [!].nes

1 Player Music A modifier (Both values can be mixed and matched, but the second code will change the music after clearing a round otherwise the selected song will only play on the initial starting round.)
8ABA:??:01
876E:??:01

[nensondubois]

Nekketsu! Street Basket - Ganbare Dunk Heroes (J).nes

Title screen music modifier
A106:??:38

DPCM pop reducer
SXOAGVSE

[nensondubois]

Kunio-kun no Nekketsu Soccer League (J) [!].nes

DPCM pop reducer
SXOAGVSE