Name: Sonic in Chaotix
Original title: Knuckles Chaotix
Platform: Sega 32X
Region: Update Hack (USA)
Media: Cartridge
Controller: Gamepad
Genre: Platformer
Gametype: Hack
Release Year: 2006
Players: 1 or 2
Hacked by: JJFTails
Version: 1.2
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This is a hack which replaces Mighty the Armadillo with Sonic the Hedgehog. The Special stage sprites were replaced with Sonic CD sprites and in level sprites were ripped from Sonic Crackers. A few of the sprites were drawn from scratch.

http://www.romhacking.net/hacks/399/