Cross Golf is a sport platform game. Put ball into the hole... if you can.
Put ball into the hole below the nominal number of strikes (PAR). Click on the ball and hold the left mouse button to adjust the angle and power. When you're ready to hit the ball, release the left mouse button
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.