Sonic the Perfect Existence Game
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.
Sonic 2 Robotniks Revenge
With 17 different monsters to battle, this entertaining boss rush hack lets you play Time Attack or Survival mode. At the start of the game, you can decide between Sonic and Tails.
Sonic Erazor
This amazing Sonic 1 rom hack has a rich tale, entirely new levels, and intriguing tasks for you to overcome. You will now have an even more distinctive experience thanks to changes made to the gaming mechanics.
Sonic Boy 2 Eggmans Trap
As a knight with a sword, Sonic fights the MEKA Dragon. Later on, you can even play as Sally and Tails!
Final Fantasy Sonic X4
Episode 4 allows you to continue the story line with Sonic battling the Guardian
South Island Adventure
Espio the Chameleon and a ton of brand-new levels can be found in a Sonic hack.
Shadow The Hedgehog
In this fan-made sprite swap, you may play Sonic 1 as Shadow. The enemy color schemes have also been modified.