A non-canonical game, "Eggman the Dictator in Sonic the Hedgehog," is a fan-made or homebrew game for the Sega Genesis. It likely features Dr. Eggman as the main antagonist in a Sonic the Hedgehog-style game, though its gameplay and overall story will differ significantly from the official Sega releases. It is not an official game produced by Sega.

Eggman the Dictator in Sonic the Hedgehog

Ecco the Dolphin (Japan)