Lights Out

Controls Goal: turn every light off. Rules: tapping a cell flips its light and the lights above, below, left and right of it (tapping the same cell twice cancels out). Controls: with mouse or touch tap a cell. On a keyboard move with the arrow keys and press Enter or Space. The Par shown above the board is the fewest presses this board can be solved in (it does not count down as you press). Score and ranking: the number of presses, fewer is higher (wasted presses count too). Time does not matter so there is no pause. Every board is built to be solvable, and a 5x5 never needs more than 15 presses. Tip: use light chasing - press the cell directly below each lit cell in a row to push the lights down until only the last row is left, and the pattern of the last row tells you which cells to press in the first row. Pressing the same cell twice is always a waste.