The aim of this game is to remove all the balls, but one, from the board.
To remove a ball, you have to "eat" it, jumping over it with another ball.
A ball may eat another ball if it is along the same diagonal or horizontal line, in an adjacent position (up, or down, left or right), and if the destination place is empty.
First, touch the ball you want to move: it will become blue. Then, touch the destination (empty) slot.