1. Sonic Advance: Get 7 Chaos Emeralds to play Sonic, Tails, Knuckles, and Amy.
2. Sonic Advance 2: Play Sonic to get all 7 Chaos Emeralds include all 7 special rings, unlock Cream, Tails, and Knuckles the same chaos emeralds and unlock Amy. When you play Amy to get 7 chaos emeralds and Extra Zone on Sonic.
3. Sonic Advance 3: First in act 3 you must get special keys to get special stage and chaos emerald, second unlock Knuckles, Amy, and Cream in act 3. Then in the extra zone play as Sonic & Knuckles in Nonaggression and True Final Boss.
Of course it is. You can't predict what's happening in front of you before you hit it...
Not without memorizing the whole level.
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