Objective: To arrange filled squares and empty squares to satisfy the count at the top and left. For example, if the counts at the top of a column are 1 1 1, and there are only five squares then that row must be: Filled, Empty, Filled, Empty, Filled.

Play: Left click on any square to alternate between a filled square and an unknown square. Right click on any square to alternate between an empty square and an unknown square