Go in to the Extras menu and enter the follow codes:
Code Effect 2839 Unlock Daphne's Black Belt Outfit 4826 Unlock Fred's Knight Outfit 1585 Unlock Scooby's Egyptian Outfit 3726 Unlock Shaggy's Native American Outfit 6588 Unlock Velma's Pirate Outfit
Contributed By: MSvest.
Unlimited Scooby Snacks & Level Selection
Password Effect 6767 Unlimited Scooby Snacks 2129 Unlock All Levels
Contributed By: AcademicPCs.
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You can submit a problem report for any non-working or fake code in the lists above.