Sound test:
Complete the game with all seven Chaos Emeralds as any two characters.
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Boss option in time attack mode:
Complete the game with all seven Chaos Emeralds as any three characters.
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Bonus level:
Complete the game with all seven Chaos Emeralds as Amy, Cream, Knuckles, Sonic, and Tails to unlock a new level at the end of Sonic's map screen.
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Tiny Chao Garden:
Complete the game with all seven Chaos Emeralds as any character.
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