How to Unlock
•  Play 300 brawls
•  Beat Classic mode with 10 different characters
•  Play in brawls for 10 hours
•  Get Sonic to join your party in The Subspace Emissary
•  With the exception of the last of the four methods listed above, you’ll need to face Sonic in a brawl and beat him after satisfying the above conditions to unlock him.