Amy Rose in Sonic the Hedgehog 2 (aka Amy in Sonic 2) is a character swap hack Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, with character Amy Rose as playable character in place of Sonic the Hedgehog. The game's sprites (modified from Sonic CD) use Amy's initial design prior to Sonic Adventure.The game was modified by Sonic Retro member E-122-Psi, with additional programming and coding by other members including MarkeyJester, MainMemory, FraGag, Selbi and Hayate.

Charmy Bee in Sonic the Hedgehog (aka Charmy in Sonic 1) is a hack of Sonic the Hedgehog by E-122-Psi, starring Charmy Bee as the playable character instead of Sonic the Hedgehog. The game is modified to use Charmy's sprites (edited from Knuckles Chaotix) in place of Sonic's, along with several modifications to the player's stats and abilities.

Eggman the Dictator in Sonic the Hedgehog (aka Eggman in Sonic 1) is a rather interesting hack of Sonic the Hedgehog made by L0st - Sonic is replaced byEggman, who runs through the stages. Due to Eggman's larger sprites, the mappings and collision engine were rewritten from scratch, and Eggman also jumps at the same height and runs at the same speed, above and below water. As a result, Eggman cannot collect rings, open item boxes, destroy enemies, be hurt by objects or drown—the only way to kill Eggman is by landing on spikes, getting crushed, or falling off the screen (all three of which require a reset). Because of this, the hack is little more than a novelty, but is an impressive one nonetheless. Eggman can't use debug mode either, but Level Select still works. Also the Special Stages are unchanged, as Eggman can't enter Special Stages from the main game.