The uni-eye makes Sonic...Sonic obviously. I remember walking into the living room and seeing Sonic Heroes being played....ew
Sonic 2 has got to be the safe pick here. Though I really enjoyed Sonic R's soundtrack too.
Sonic 1 Sonic 2 Sonic 3 Sonic and Knuckles Sonic 2 and Knuckles Sonic 3 and Knuckles Sonic R Sonic 2 on GG Sonic Adventure Sonic Adventure 2...
I can see what you mean, when Wario started running fast I could take that games concept and see Sonic in it. 2D games have been mostly forgotten...
Separate names with a comma.