Sonic 1: Sonic 3 Edition is a fan-made ROM hack that incorporates elements from Sonic the Hedgehog 3 into the original game. It may include assets, music, or levels from Sonic 3, offering a hybrid experience.  The core gameplay mechanics would still be rooted in the original game but might be enhanced or modified. It is the work of independent developers and not an official Sega release.

Sonic 1: Sonic 3 Edition

Sonic 1: Black and White Edition V2.5