Ultimate Sonic Mugen

 is a M.U.G.E.N based fighting game based on Sonic the Hedgehog series.

This game has characters and stages based on the Sonic the Hedgehog games on the Sega Genesis/Megadrive and plays very similarly to those games. Fights involve collecting powerups and rings and knocking rings out of your opponent.

Characters

 * Sonic
 * Tails
 * Knuckles
 * Espio
 * Vector
 * Carnival Night Boss
 * Metal Sonic v1
 * Metal Sonic
 * SMS Sonic
 * Dr. Robotnik

Stages

 * Casino Night Zone
 * Chemical Plant Zone
 * Death Egg
 * Flying Battery Zone
 * Green Hill Zone
 * Hidden Palace Zone
 * Hydrocity Zone
 * Launch Base Zone
 * Marble Zone
 * Oil Ocean Zone
 * Scrap Brain Zone
 * Spring Yard Zone