Get all the chaos emeralds and fight the final boss.
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Play as sonic shaow and knuckles
Collect all 7 chaos emeralds.If you didn't then you cant play as Super Sonic or Super Shadow!
you have to got to sky sanutary and under the hook there are the super emerald
get all 7 chaos emarelds and get 50 rings
You don't unlock him! If you unlock Sonic and play as him, Super Sonic is his final smash.