Sonic 3 Super Edition, like other entries, is probably a fan-made enhancement of Sonic 3. This ROM hack focuses on enhancing the original game's content through additions or improvements. These might include graphical updates, additional levels, changes to special stages, or altered gameplay.  Fan-made projects of this kind typically require a high level of programming skill and knowledge of the original game's codebase. The creators are most likely found within online Sonic fan communities. It is unlikely to have any involvement from Sega, but it is a product of the game's lasting appeal.

Sonic 3 Super Edition

Sonic 3 Remastered