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awesome game!.
it has alot of secrets that you can use like debug mode and splitscreen (turns the game into a two player) and other stuff that i havent unlocked but i know about! but the best part of all, is that you can download wads for the game! you can play as about any buddy ! (and with great programing skills,you can even make a character of your own!)
Pros: i love the the fact that you can download characters onto it (thats all but its enough to get anybody to want it)
Cons: you cant modify a character that comes with the game such as sonic tails and knuckles