most of these have been discovered by me, through trial and error, and a little bit of educated guessing. (all tested on real hardware!)
Any codes that were not found by me are from either the official game genie website, or here.
SONIC 1 Game Genie Codes
- MDLT-AAG4: Animation frames are jumbled
- HDLT-AAGR: Scrambled message will follow Sonic
- AE6T-AAD8: 2 Sonics????
- AEMT-BJB8: Special stage with tons of emeralds and warps to zones
- AEMT-BAD8: Serial killer code
- AELT-AACW: Atari graphics
- AELT-AAD4: Glitched levels
- AE6T-A4WE: Weird things happen on game screen and on gauges
- AEMT-AAZ4: Scrambled title, strange special stages
SONIC 2 Game Genie Codes
- AEMA-BAD4: Corrupts the HUD
SONIC 2 NICK ARCADE PROTOTYPE Game Genie Codes
- AELT-AACW: Creepypasta-ass title screen
- NELT-AAG6: The Matrix
- FEMT-BF44: i honestly dont know but its playable sometimes
KEKCROC IN SONIC 1 Game Genie Codes
- AE3T-CABE: Turns Kekcroc into a jumble of level chunks* (see details page)
- GHZ: Made of palm tree chunks (yellow)
- MZ: Made of breakable cube chunks and grass chunks (orange and green)
- SYZ: Made of sign chunks, sometimes displaying the word “let’s” (gray)
- LZ: Made of indistinguishable chunks, mostly green (blue underwater)
- STZ: Made of ramp chunks (bright yellow, green, and gray)
- SBZ: Made of indistinguishable chunks (earthy colors and some gray)
- AELT-AAD4: Glitched level art
- AEMA-BAD6:
(mash C to get past errors!)
- AEMT-AAZ4: Funny colors (changes special stage layouts, too)
- AEMA-ACEY: What the hell is going on
- EEMA-BA64: Glitchies
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