First, the screen will appear 3 balls. Once you move a ball, the other three balls will be added at random. Four same balls at least in a line will disappear and get scores. And when the balls disappeared, it would not add new ones. The path that Moving a ball will be prevented when the others block it and have no paths.
In the Arcade Game,there are many grids which cant across.
Some stages cant compete with your clever tactics!