compleat 3 games that are in there
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knuckles in sonic 2 :play sonic 2 and sonic spinball 30 times
Either play the games lots of times or play them for many hours. Also having other sonic games on your memory card will unlock some games.
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!
You can't. It's not on Sonic Mega Collection or Sonic Mega Collection Plus. Sonic CD is only available on Sonic Gems Collection for Nintendo Gamecube.
You can't.