This code gives you everything -- the secret characters, levels, and 'Y' the Alien. To enter the code, go to the OPTIONS screen, then
choose GAME STATUS. Click on any driver, then enter the code "WMNNWLHTSCUCLH".
Monster Truck Tires
For monster truck tires, enter the password "MONSTER WHEELS".
More Powerful Missiles
To make your homing missiles do more damage, enter the password "DEADLY_MISSILE".
Kody's PlayStation Codes