A minor variation of the original "Forgotten Worlds", "Forgotten Worlds (World) (v1.1)" likely represents a later release or updated version of the Sega Genesis game, possibly including bug fixes or minor gameplay adjustments. This version retains the core gameplay of the original, a blend of exploration, shooting, and platforming, but might have received enhancements.  Additional research is required to determine whether this was an official update by Sega or perhaps a ROM hack from the community.

Forgotten Worlds (World) (v1.1)

Fly with Tails in Sonic the Hedgehog 2