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 

These codes work in the demo and the full version.