To select a tile, use the arrow keys to move the spotlight on to that tile and press the Enter key.

Once a tile is selected it will toggle the state of the selected tile and its non-diagonal neighbors.

To select a tile move the mouse pointer over the tile and click it.

Once a tile is selected it will toggle the state of the selected tile and its non-diagonal neighbors.

The progress through the levels is either by turning off all the lights in that level or by pressing the menu button in the top-right corner of the window and selecting Next puzzle or Previous puzzle.

The current level is shown in the title bar.