Unlockable - How to Unlock: Last Episode - Beat Sonic's Episode, Shadow's Episode, and Silver's Episode
Unlock 'Extras' Menu: Complete either Sonic, Shadow, or Silver's story 100% to unlock the Extras menu on the main menu.
Unlockable Characters: Meet certain requirements in Sonic's story to unlock Shadow and Silver's stories.
Acquire Shadow the Hedgehog: Complete Crisis City with Sonic.
Acquire Silver the Hedgehog: Beat Silver the Hedgehog boss battle with Sonic.
Acquire Audio Room: Beat Sonic, Shadow, or Silver's story mode.
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