All vehicles:
At the main menu, press L1, L1, Left, Square, Left, Square, R2, Square, R2.
All modes:
At the main menu, press Square, Square, Square, Left, Right, Down, Right, L1, Down, R2, R2.
Unlimited time:
At the main menu, press Down, Down, Up, Up, L2, Up, Up, Square.
All maps:
At the main menu, press Down, Down, Up, R2, R2, L1, R2, R2, Down, Square.
All challenge tracks:
At the main menu, press Down, Down, Down, L2, L2, Down, Right, R2, Square.
Unlimited damage:
At the main menu, press L2, L2, R1, R2, Square, Up, Up, Square.
All police levels:
At the main menu, press Left, Left, Square, L2, Square, Up, Up, Square, Left.
All steam and gas turbines:
At the main menu, press Up, Up, Down, Up, Square, R1, Down, L2, Square.
Big aluminum mode:
At the main menu, press Left, Up, Down, Right, Square, Square, L2, R2.
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Gumball 3000 Cheats, Codes & Walkthrough/Guide/FAQ for PS2 from Cheat Code Central
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