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Playstation 2 - Wacky Races cheats

Choose the "Cheats" option in the main menu. Enter any of the 
following codes, then enable that cheat at the "Code Collection screen.

Unlock every tracks: Enter CHIMPGIVEAWAY
Unlock every cars: Enter MONKEYSPOILERS
Unlock every gadgets: Enter GADGETDEAROUT
Unlock kid mode: Enter THOSEWACKYKIDS

Unlock Bastardly Difficulty 
Choose Arcade Mode, a car and a name, after go to the options menu and 
enter the code "FASTCARSAGOGO" in the cheat section. 

Unlock Mirror Mode
Find all of the hidden mirrors on each track