Scooby Doo! Night of 100 Frights Cheats (GameCube)

Pause the game.  Hold down L and R, then press 3(B), 3(X), B, X, B.

If you game clock is set to one of these holidays, neat stuff happens:

  December 25th: Snow 
  January 1st: Fireworks 
  October 31st: Bats 
  July 4th: Fireworks

Pause the game.  Hold down L and R, then press 2(B), X, 2(B), X, B, 3(X).

Pause the game.  Hold down L and R, then press X, B, X, B, X, 3(B), 2(X), B, 3(X).

Pause the game.  Hold down L and R, then press B, 2(X), B, X, B.