Defeating the extra Boss
On the Moon zone the Boss that comes is quite hard to beat so I will tell you how to beat it.
When you are Super Sonic press the A button and then the B afterwards to hit him in the head. If you are low on rings hit those butterfly robots to get rings. I hope this helps.
If you need more help, we've got more Sonic Advance cheats and also check out all of the answers for this game
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