Sonic 3 Delta is a ROM hack of Sonic the Hedgehog 3 for the Sega Genesis. Details on its specific additions or changes are limited.  It's likely another community-created modification. While built upon Sega's 1994 release of Sonic 3, this hack will introduce its own unique alterations to gameplay or story.  Further information would be necessary to fully detail its features.

Sonic 3 Delta

Sonic 3 Complete Sonic 2 Sprites