Hot Wheels Velocity X cheats and cheat codes for Playstation 2

Get all cars and tracks:
At the main menu, hold R1 + L1 and press Circle, Square, Square, Triangle, X. 

Unlock Upgraded laser: 
Finish Challenge 18 in very hard mode

Unlimited ammunition: 
Hit minimum 50 Barrels while completing Challenge 18. 

Unlimited health:                                        
Hit minimum 179 Barrels while completing Challenge 17. 

Unlimited turbo: 
Get 8 Zappers while completing Challenge 4. 

Timer speed: 
Hit minimum 60 Barrels while completing Challenge 12. 

All cars: 
Hit 11 Bonus Stunt items while completing Challenge 8. 

All worlds: 
Collect the Hidden Key while completing Challenge 18. 

All gadgets:
Hit minimum 30 Barrels while completing Challenge 7. 

Unlock extra stages:
Burnout Glacier stage - Finish adventure 9 
Crankshaft Bay stage -  Finish adventure 6 
Turbine Sands stage - Finish adventure 3 
Underworld stage - Finish adventure 12