Scooby-Doo 2: Monsters Unleashed (GBA)
CheatingDome.com
All Levels
At the password section type (M,D,B,C,8,M,F,4) to get all levels.
Final Level
Enter code at the password screen:
5DBY3MT8: Final Level, Scooby V.S. Masked Guy
Level one complete
Go to the password section and type in "c, b, b, c, b, b, b, b".