Sonic Advance Cheats

Go to game start on the main menu, and select Sonic (don't press A, just make sure he is on your screen.) When you do this, do the following:

Down, Right, Up, Right, L, Right, R, Right, A.

You should hear a chime like you just collected a ring letting you know the code was right. Select a course (if you have that option) and have fun.

Oh, by the way, the computer Tails isn't very smart, but it can be helpful. (He doesn't Die.)