You can choose from many racers and tracks, then run in training or racing mode. Your machine floats in the air and you have to complete a lap.
Arrow keys to indicate the movement direction (also you can do it moving the mouse, and optionally pressing the button to indicate if you point up or down). Space bar to shoot. Use the E/Q keys to switch to the previous/next weapon. Or use the 1-8 keys to switch weapons directly.