TopFreeGame Dirt Bike 4 2011-12-09 Dirt Bike 4 Motorcycle Games Balance Games Stunts Games 1 Player Games Obstacle Games Your goal is to complete all the levels in the shortest possible time without falling off your bike. The shortest your time, the higher your score. Alternative content Play Dirt Bike 4 Full Screen Dirt Bike 4 (Full Screen Play) Dirt Bike 4 Game Controls Up Arrow Key - Accelerate. Left / Right Arrow Keys - Lean. Down Arrow Key - Reverse.