Sonic The Hedgehog 2 Game
In 1992, Sonic the Hedgehog 2 was released as a Sega Genesis video game. Since Sonic was the only character in the original game, Tails joining in to assist Sonic made this game special. Sonic the Hedgehog 2 allowed you to play as both Sonic and Tails at the same time, which was revolutionary for its time. In Super Mario Bros, you had to control Mario and Luigi separately.
Sonic Blast GG
15 levels let you command Sonic and Knuckles as you battle Dr. Robotnik.
Sonic 1 Megamix
In this fantastic Sonic the Hedgehog mix-up rom hack, you can play as Sonic, Mighty, or Shadow (from a menu of options).
Sonic 3 Complete
has four different play modes, including Blue Sphere, Sonic 3, Sonic & Knuckles, and Sonic 3 Complete.
Pana Der Hejhog
Although it just has one level, this hack boasts spectacular boss battles, smooth sprites, and shifting weather.
Sonic Boy In Monster Land
Sonic must battle the forces of evil as a young boy using only his dependable sword!
Super Contra
8 more stages are available for you to complete as you use the spread gun, fireball, and machine gun.