Nickelodeon Party Blast cheats and cheat codes for Gamecube

Unlock the Bungi games
Highlight the Bungi game in the game selection screen, then press
Up, Up, Down, Down, Left, Right

Unlock the Clam games:
Go to Blast, after press Up, Up, Down, Down, Left, Right

Unlock Secret characters:
Go to Blast, after press Down, Down, Right, Left, Right, Up, Left, Down, Right