Use a tool like (Windows) or Unipatcher (Android) to apply the Megamix 5.0 patch to your clean Sonic 1 (JU) [!].bin ROM.
: It evolved into a massive collaboration involving key community figures like Simon Thomley (Stealth). sonic megamix 5.0 online
If you want to experience this legendary hack without setting up complex hardware, several platforms offer browser-based play: Use a tool like (Windows) or Unipatcher (Android)