When in game play type in the following codes.

warp - makes everyone go slow-motion except you 
glider - lets you glide through the air 
sleep - funny, makes all the others loose control 
apollo - makes your vehicle jump once (good for going back to default) 
spider - allows you to drive on the walls & ceilings (neat) 
blast - makes a hurricane and blows all your competition away 
hover - self explanitory 
lunar - simulates low gravity 
burn - lets you shoot a fire like missle 

These codes work in the demo and the full version.

All tracks and cars:
Input 'megasaxon' as your name to gain access to all tracks and cars.

Expert and Advanced Levels:
Type 'aaronfoo' to gain access to the expert levels, type 'jeff' to get 
the advanced levels.