Ride your bmx and collect the diamonds. Explore the levels and find the hammer to open the locked areas, follow the arrows. Good luck!
Arrow keys to move. Down arrow key for brakes. Press Z to turn around. Press X to recover from a fall. For extra speed, lean back while riding.
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.