5: Sonic Advance

4: Sonic the Hedgehog

3: Sonic the Hedgehog 2

2: Sonic CD

1: Sonic 3 & Knuckles

Runner-ups: Sonic Advance 2, Sonic Advance 3, Sonic Adventure, Sonic Adventure 2, Sonic Rush, Sonic Rush Adventure

http://www.youtube.com/watch?v=gGqux8W2_d8

Check it out.