Sonic in Chaotix
From Sonic Retro
The Title screen sprite comes from a Sonic in Chaotix hoax which was created earlier. The sprite in the side-scrolling stages comes from Sonic Crackers and the bonus stage sprites come from Sonic the Hedgehog CDs Special Stage. Some custom sprites were made by KojiChao.
NOTE: To play the hack in Kega Fusion v3.6 and up, the "Fast 32X Timing" option in the 32X configuration tab must be enabled. For older versions of Kega Fusion, a special release, which can play the hack, was made available here (info).