you can only play as super sonic when you fight the finalhazard.
Chat with our AI personalities
But you can play metal sonic.
You need action replay
(Hope you meant sonic battle as in SBA2) Play hero mode all the way till you get to the part(scene) were you and shadow turn super,then fight the final hazarded. :P
Amy is already unlocked, just choose to play as her
yes, you can play any of your gamecube games ont he wii