You can't :3 You can play as Sonic the Hedgehog and Blaze the Cat, but no other characters are playable.
You play as Shadow when you finished Crisis City as Sonic. Shadow's Episode will then be availible to play. You can also play as Silver the Hedgehog when you defeat him for the first time.
NO!
Yes, I think.
you cant but you can play as super shadow by beating every level.
Go to any stage where sonic is your partner, get a second controller and have fun!
Yes. In all the games, you play as the original. Shadow just suffers from amnesia.
Yes you can play sonic the hedgehog for psp i happen to own it myself....
He was presumed dead in Sonic Adventure 2, turned out to be an Android in Sonic Heroes, But it turned out he suvived the fall from SA2 and returned in Shadow The Hedgehog. So the one you play as in the games is the original.
if your talking about the first one NO but if you are talking about next gen then YES
It's called Sonic the Hedgehog (the new one) on XBOX360 and PlayStation 3.
Once you finish Sonic, Silver and Shadow's story, the last story becomes playable.
You can't. Shadow is the only playable character, and in the final boss when you play as Super Shadow, there is no companion character.