Super Mario World (Unl) for the Sega Genesis is an unlicensed title that attempts to recreate the Super Mario World experience on a different platform. Its creators and release date are likely unknown.  Gameplay probably involves replicating the core platforming mechanics of the original Super Mario World game, but adapted to the capabilities and limitations of the Sega Genesis. The lack of licensing underscores its unofficial status.

Super Mario World (Unl)

Super Mario 2 1998 (Unl)