Sonic the Perfect Existence
This rom was one of the first Sonic 2 hacks to substitute Shadow the Hedgehog for Sonic and to add Mizu as Shadow's companion. Even if the Shadows sprite set was not all finished, the new levels and music are excellent.
Ultimate Robotnik Duels
Be prepared to duel in this fighting game. Choose your character from: Sonic, Shadow, Mario, Raiden, & more!
Knuckles In Sonic 1
In this Sonic the Hedgehog 1 hack, Knuckles takes the place of Sonic. Knuckles can climb walls and glide through the air but is less adept at jumping. Some bosses and stages will be made easier by Knuckles' special skills, while others will be far more challenging.
Sonic Platform Game 1
A simple Sonic the Hedgehog platform game where you run to the end as fast as possible. It's just one level though.
Sonic Stardust Gear
A complete Sonic 1 rom hack with brand-new levels, music, and six new, difficult worlds to explore