This game is also available on PS2.
Retro Game Cheats for Hot Wheels Velocity X (Gamecube)
Effect: Get All Items
Effect: Get all worlds
When:
During the game
How:
There is a hidden key you can use in challenge #18 to unlock all of the worlds in the game.
Submitted By:
Effect: Infinite turbo
Effect: Unlock All Cars
Effect: Infinite Ammo
Effect: Infinite health