Version 5.0 (specifically the 5.0a alpha) was intended to be the definitive edition. It introduced massive changes to the original game's foundation:
: Provides a full browser emulator for Sonic Megamix 5.0 with support for keyboard and controller inputs. sonic megamix 5.0 online
: Sonic utilizes the Homing Attack and Light Dash from later games, while Mighty uses a unique shield-based inventory system. The Legacy of Team Megamix Version 5
If you want to experience this legendary hack without setting up complex hardware, several platforms offer browser-based play: several platforms offer browser-based play: