Original URL: http://www.psxextreme.com/ps2-cheat-print/581.html
Hot Wheels Velocity X

Unlimited Ammo - In challenge 18, hit 50 barrels.

Unlimited Health - In challenge 17, hit 179 barrels 

Unlimited Turbo - In challenge 4, collect 8 zappers

Unlock all Worlds - In challenge 18, find the hidden key.

Unlock all Cars - In challenge 8, hit 11 Bonus Stunt items.

Unlock all Items - In challenge 7, hit 30 barrels.

Upgrade Laser - Beat challenge 18 with very hard difficulty setting.

Unlock Turbine Sands level - Beat adventure 3.

Unlock Crankshaft Bay level - Beat adventure 6.

Unlock Burnout Glacier level - Beat adventure 9.

Unlock Underworld level - Beat adventure 12.

Unlockables - Challenge mode

Beat... Unlocks...
Challenge 1  - Laser Cannon
Challenge 2  - Underworld Race
Challenge 3 - Sonic Boom
Challenge 4 - Atom Blaster
Challenge 5 - Sewer Pipe Arena
Challenge 6 - Sho-Stopper Vehicle
Challenge 7 - Freon Bomb
Challenge 8 - Crankshaft Docks
Challenge 9 - Energy Shield
Challenge 10 - Jet Boosters
Challenge 11 - Glacier Race
Challenge 12 - Surf Crate Vehicle
Challenge 13 - Super Zapper
Challenge 14 - Treadwell Plaza
Challenge 15 - Magnet Mine
Challenge 16 - Doom Disks
Challenge 17 - Underworld Arena
Challenge 18 - Krazy 8's Vehicle