...meh, might as well give this a go. The crossed-out ones kinda got lost over the years, but they're around somewhere, I swear it.
Genesis: Sonic 1,2,3, & Knuckles, Classics, Mean Bean Machine, 3D Blast, Spinball, Wacky Worlds Creativity Studio (hey, Sonic's in it!)
32X: Chaotix
GameGear: Sonic 2, Drift 2, Chaos, Triple Trouble, Tails Adventures
Saturn: Sonic Jam, 3D Blast, R
Dreamcast: Sonic Adventure, Adventure 2, Shuffle
GBA: Sonic Battle, Advance 1, 2, 3, Sega SmashPack
GameCube: Sonic Adventure DX, Adventure 2: Battle, Heroes, Riders, Gems Collection, Shadow
DS: Sonic Rush
PC: Sega SmashPack, Sega SmashPack II, Sonic 3D Blast, R, Sonic & Knuckles Collection (which I'm playing in the background whenever I'm on TSC), Sonic CD