When you complete 100% with every character, you will unlock Super Sonic.
But beware, he has only one level, and unlike other characters, you can't just wander round once you have done his level. So you just do it over and over again.
Plus, before get to be him there is a 15 minute demo with about 10 second of walking around in between.
So, all in all, this cheat isn't all that great!
More tricks, tips and cheats for this game are right here - Sonic Adventure cheats
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