This is a speedway race. Four motorbikes, four drivers, one track. There is also posibility to play with three other players simultanously on local machine.
Just use one key: spacebar. Use it to turn the motorbike and also to start driving. Remember to do not make a falstart and don't hit the green field on the center.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.