Do the correct mission to play different levels in story mode. After 5 levels, there will be an ending. Play all levels to unlock the final boss.
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No, shadow the hedgehog is black.
No shadow the hedgehog does not have a girlfriend
No it is not. Sonic the Hedgehog is on PS3 Shadow the Hedgehog is GameCube, Xbox, and PS2
shadow of course!
Beat every stage and boss to reach the final story, and beat it. Devil Doom is the final boss.