Unlocked by completingSunset Hill (Zone 2), Act 3 with Sonic as team leader.
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no, but you can unlock knuckles, amy, and cream.
You can't.
You can play them in the Sonic Mega Collection Games, but not in Sonic Gems:i can go super sonic says:but you need to unlock sonic 3 and knuckles that's what i had to do!
Brace yourself. You have to enter Sonic 3 (You don't have to play it, just enter and exit it afterwards.) Do this 30 times, and do this with Sonic & Knuckles 30 times.
amy is already unlocked in sonic advance. in sonic advance 2 beat the game with every character with all 7 chaos emeralds to unlock her. in sonic advance 3 beat toy kingdom with sonic as leader ro unlock her.