Unlock T.H.U.D.!
At the main menu, go to options, then select cheats. Enter NOOO!! as a password. There should be a deep WHOOSH! sound to confirm the code. Go to free skate or whatever and T.H.U.D. should be the last character. GAMECUBE ONLY!!!
We have more cheats and tips for this game here, Tony Hawk's Underground cheats
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