you need to get all seven special rings then you go to a special stage and have to get 300 rings then get an emerald.
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AnswerThere is not any code for All Chaos Emeralds. You have to complete all of the special stages like most sonic games to get the Chaos emeralds, NO CHEATING!!! >:[
beat the game with one charicter and have all seven chaos emeralds
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.
Get all the chaos emeralds and fight the final boss.
there are hidden rings in each stage find it and then you have to play the spacial stage and win then you get all the chaos emeralds and soon enough you can play as super sonic!