LightsOut

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Rules: LightsOut is a small game with the aim to clear the board by clicking on the grid. When clicked on a grid-cell, the cell is turned on if it was off and off if it was on. The same happens to all neighbor cells of the clicked cell. If you have no clue, you can use the AI to solve it. Just press the space bar (or double tap on mobile devices) and click all marked cells.