Is a logic puzzle with simple rules and challenging solutions. Is played on a rectangular grid. The grid has both black cells and white cells in it. The objective is to place light bulbs on the grid so that every white square is lit. Also, no light bulb may illuminate another light bulb. Left click a square to place a light bulb. Right click to mark with X.

Is a logic puzzle with simple rules and challenging solutions. You have to draw lines between the dots to form a single loop without crossings or branches. The numbers indicate how many lines surround it. Left click between the dots to connect them. Right click to mark with X. What am I supposed to do? .

Is a logic puzzle with simple rules and challenging solutions. You have a grid of squares, which must be either filled in black or marked with X. Beside each row of the grid are listed the lengths of the runs of black squares on that row. Above each column are listed the lengths of the runs of black squares in that column. Your aim is to find all black squares. Left click on a square to make it black. Right click to mark with X. Click and drag to mark more than one square.

Is a logic puzzle with a bit complicated rules and challenging solutions. Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square. What am I supposed to do? .