I think he has eight if you count the ones on his back
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no, he only has a nose and his spikes that are on his head
in sonic generations game,50 power rings
shadow the hedgehog looks similar to sonic the hedgehog and has been mistaked for him in the past. Shadow is black and red and his spikes are angled slightly. his eyes are more slanted than sonic's, and he has a red stripe that goes from his forehead to the end of his spike, and from his wrist to his elbow.
Custom Shoes: Seen in many various games of sonic the hedgehog such as: Sonic 06 (powerup), Sonic Unleashed (powerup), and Sonic Adventure 2 (powerup).
So many i have lost count. depends if you count shadow and knuckles as sonic's friends