Collect all golden coins to buy items in the market; also collect the bonuses that you find, they help to improve your car: some of them give extra speed, others enable you to kick your rivals, etc. You can play in 3 modes: championship, single race or against timer. Between races you can buy improvements for your car.
Arrow keys to move, space bar to apply powerups, key P to pause. Between races, in the market, use the mouse to interact.