The game automatically saves the furthest act you ever got to.
You can save the Tiny Chao Garden.
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Sonic advance 3 saves automatically after an act or boss. It also saves chaos and chaos emeralds as you collect them.
Sonic Advance 2 has internal memory, which means it saves itself.
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.
no in order to play as shadow you have to hack the game there is no possible way to unlock shadow PLUS! shadow wasnt even a thought back when sonic advance was made
It saves automatically after every fight.