All tracks:
At the Press Start screen, press R2, L2, Circle, Circle, Square, Square.
All cars:
At the Press Start screen, press R2, L2, Square, Square, Circle, Circle.
Kurt's Spy Car:
At the Press Start screen, press Square, Square, Triangle, Circle, X.
Smash Mouth car:
At the Press Start screen, press Square, Square, Square, Triangle, Circle, X.
Unlock Bonus vehicles:
Enter SMASHMOUTH as a code.
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Hot Wheels: Highway 35 World Race Cheats, Codes & Walkthrough/Guide/FAQ for PS2 from Cheat Code Central
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Hot Wheels: Highway 35 World Race Cheats at CheatingDome.com.