Dirt Bike/Dirt Bike 3D Dirt Bike and Dirt Bike 3D are motorcycle simulation games. The game uses physics to simulate the motorcycle's suspension, making the action more realistic than any other racing game. Cost: $15 Buy full version       Trial version       Publisher: Brad Quick     Descriptions Dirt Bike/Dirt Bike 3D: Dirt Bike and Dirt Bike 3D are motorcycle simulation games. The game uses physics to simulate the motorcycle's suspension, making the action more realistic than any other racing game.