To enter a cheat code, first go to the Save Game screen. Select Slot 10, type in the cheat code and press [ENTER]. You can use multiple cheat codes together.

NOAICARS - No AI racers in the LAN game
STICKIER - No 3D collisions (you can still spin each other but your cars will not leave the ground)
AARDVARK - All collisions turned off
ITSLATE  - No special effects (3Dfx version only)
CREDITZ  - Show Credits with cool pics
SRACLLA  - Unlock All Cars
LEVELLLA - Unlock All Tracks
SPAZZY   - Test Drive on Acid
BANDW    - Black & White Mode
MIKTROUT - BIG Cars
MPALMER  - Mini Cars
GONZON   - Fast Forward Mode
GONZOFF  - FF Mode Off
BIRDVIEW - View From Above
NITROXXX - nitro boost with horn button
BOBCRED  - extra credits
COLOUR   - changes screen back to color when in b and W mode