To use these cheat codes, type them in during a race. 
If you pause the game by hitting P, you can type in the 
cheats while the game is paused. Typing SLIPPERY will 
unpause and then pause the game again, so try to type it 
fast. Another good time to enter a code is after the loading 
screen, just before the track announcer shouts, "Go!" 

Code       Result 
------------------- 
BOUNCY   - extra-springy vehicles and track boundaries 

STICKY   - increased traction for all cars (works well with the 
           MOON cheat) 

SLIPPERY - loss of traction, like driving on ice 

TURBO    - double your normal car speed (works well with the 
           HEAVY cheat) 

WAR      - unlimited Bottle Rockets for everyone (Ghost power-ups 
           are invaluable in this mode) 

GHOST    - all "ghosted" vehicles (no collisions) 

HITME    - aggressive computer drivers who ram you when you are in 
           their way 

MOON     - reduced gravity 

HEAVY    - increased gravity