The object of this game is to move your pieces so that they are in a horizontal or vertical row or form a square or occupy all of the corners and to prevent your opponent from doing any of these. Also, if you trap an opponents piece in a corner you lose. You can move any piece in any open direction as long as you move it as far as it is able to go in that direction.
There is a new game option in the file menu of the window that opens once you start.
Click the "play ball" button to start.