Shadow Xs Game
Shadow Xs is in the same spirit of Sonic Xs except that - shockingly - you are Shadow instead of Sonic. Confusing I know. You have 60 seconds to climb the level skyward. Avoid the robots that shoot green energy beams at you and grab rings to increase the all important score. The game seems pretty hard at first but the exit is not that far up there, trust me.
Sonic Labyrinth
This 1995 Game Gear action/puzzle game is a distinctive addition to the Sonic library.
Sonic 2 Retro Remix
This rom hack puts an emphasis on exploration and finishing tasks like collecting Chaos Emeralds or taking out bosses.
Amy Rose In Sonic 2
Have you ever considered playing Sonic 2 as Amy Rose? Here's your opportunity, though. Tails also shows up as usual.
Super Mario Bros 3
A NES classic in which the Mario brothers have to save the rulers of each of the eight kingdoms before facing Bowser
Sonic Advance 3
Dr. Eggman has created the wicked robot G-merl, and Sonic and Tails must intervene to stop him.
Sonic ATV Trip
Sonic hops on his All Terrain Vehicle (ATV) and tries to collect the rings as he proceeds to the finish