How many levels does Rad Racer have?
There are eight different levels of requiring increasing skill. Even if time runs out, the vehicle can continue to coast for awhile; if the vehicle reaches a checkpoint before running out of momentum, the game continues.
How to play Rad Racer?
The idea of Rad Racer is to rally through a course, and make it to check points before the timer runs out. If a player hits a road sign or tree at any speed the car crashes. Hitting another car directly from behind will severely slow the car down.