Sonic Megamix is one of the most famous romhacks of Sonic the Hedgehog 1, created by Team Megamix. This game completely overhauls the game, adding four new playable characters and even getting ported to the Sega CD. A lot of what ultimately went into Sonic Mania can be seen in Megamix, and thus, for the final Hacktoberfest video, we’re taking a look at it.