Cheat mode:
Select "Options", then "Bonus", then "Enter Cheat Code" to activate the following cheats, which will appear on the "Activate Bonuses" screen. The cheats have no effect in championship mode.

Extra power:
Enter GRUNTSOME as a code.

Nitro button:
Enter GLYCERINE as a code, then press X + Circle (Accelerate + Map) during game play for a nitro boost.

Invincible car:
Enter MADCAB as a code.

705 springs:
Enter VANISHING as a code.

Chrome cars:
Enter T2 as a code.

All cars:
Enter FLEETING as an access code.

All tracks:
Enter MAGIC23 as an access code.

Low gravity:
Enter EUROPA as a code.

Mirror mode:
Enter WEFLIPPED as a code.

Blurred vision:
Enter ETHANOL as a code.

Double hill height:
Enter TWINPEAKS as a code.

Race backwards:
Enter REARFEAR as a code.

Exploding track curbs:
Enter KRAZYKERBS as a code. Drive over the red and white rumble strips to jump in the air.