Type  in cheats while you are playing, and an icon will appear in
the top right of the screen.

Cheat code:             Effect:
APOLLO                  Car rises off the ground when holding ALT key
BLAST                   Repels other cars
BOMB                    Launches a bomb from your car onto the track
BURN                    Briefly ignites a spot near your car
GLIDER                  When in the air, car controls like a glider
HOVER                   Cars hover
ICBM                    Car acts like a missile
JUMP                    Each time, jumps car several feet in the air
LAUNCH                  Hit "a" to launch a car, 
                        "z" to move in the direction you're facing
LIGHT                   Lighter car
LUNAR                   Lunar gravity
SLEEP                   AI cars don't steer, they just accelerate
SLIPPY                  Slippery surfaces
SPIDER                  Car adheres to any surface
STICKY                  Stick surfaces
SUCK                    Cars gravitate towards each other
TIMEWARP                Slows time for AI opponents
TWISTER                 AI cars get whipped around by an invisible tornado
WARP                    Other cars crawl over track

While in the Sign-in Screen:

Type Jeff as your name - access Advanced Levels
Type AaronFoo as your name - access Expert Levels
Type Megasaxon as your name - access all levels/AIs