Use the LEFT and RIGHT arrow keys to steer. Hold down these keys when you hit a jump to perform stunts:
LEFT: roll left
RIGHT: roll right
UP+LEFT: spin left
UP+RIGHT: spin right
Perform different stunts while chaining jumps to earn huge point multipliers. Jumping on the rail does not count as a stunt unless you chain it from a ramp jump. If you bounce on the rail more than once you will lose your multiplier. Press ESC at any time to pause and bring up the instructions screen.