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Step 1
Play through 300 brawls to be able to face off against Sonic the Hedgehog in a brawl. Defeat Sonic to unlock him as a playable character.
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Step 2
Play through the game as 10 different characters, beating the Classic Mode with each of them to be put into a brawl against Sonic. Defeat him to unlock him as a playable character.
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Step 3
Play in versus brawls for a 10 logged hours to be pitted against Sonic in a brawl. Defeat Sonic to unlock the character.
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Step 4
Beat the Subspace Emissary in Story mode and persuade Sonic to join your party, unlocking him as a playable character.
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