At any time during gameplay, press START to pause, then quickly enter the following codes:
Code Effect Hold L+R and press X, B, X, B, X, B, B, B, X, X, B, X, X, X. All power-ups hold L+R and press B, B, X, B, B, X, B, X(x3) All warp gates Hold L+R and press B, X, X, B, X, B Unlock alternate credits sequence Hold L + R, and press B (x3), X (x3), B, X, B Unlock Movie Gallery
Set your Gamecube clock to the following dates for something different to happen in the game:
Unlockable How to Unlock Bats October 31st Fireworks January 1st Fireworks July 4th Fireworks December 31st Flowers and Hearts when snacks are collected January 9th Green water and smoke March 17 Hearts on Scooby Snacks February 14 Snow December 25th
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You can submit a problem report for any non-working or fake code in the lists above.