Lights Out Puzzle

Clicks     Level

   Current Mode       

How to play:  Your aim is to switch off all the lights.  Click on any light, if it’s on it will go off and vice versa.  Also the lights next to it will change on or off. By carefully choosing which lights to click, you can solve the puzzle.   There are several levels to try or choose ‘All On’ or ‘Random’ puzzle. To start again, press the ‘Reset’ button and the ‘Solve’ button shows the shortest solution.  The marked lights are the ones you need to push. Press ‘Solve’ again to continue play. To play a new random puzzle, press the ‘Random’ button or you can Create a new puzzle.   Hint: Solving by Light Chasing

Solving by Light Chasing

Turn out all the lights on the top row, by pressing the lights on the second row that are directly underneath any lit on the top row. The top row will then have all it’s lights off.

Repeat this step for the second, third and fourth row. (i.e. chase the lights all the way down to the bottom row). This may solve the puzzle but is more likely that there will now be some lights left on in the bottom row. If so, there are only 7 possible arrangements. Depending on which arrangement you are left with, press certain lights in the top row and repeat the light chasing down the board. This works but is not the shortest answer which you can find using the ‘Solve’ button.

The table shows which top-row lights you need to press.

Lights on
bottom row
Press these
on top row

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Create Your Own Puzzle

Press the ‘Mode’ button to change to create mode. You can then turn the lights on and off individually. You can check if your puzzle is solvable by pressing the ‘Solve’ button. If a solution is shown - you’re OK. To clear the board, press the ‘Clear’ button. To change back to play mode, press the ‘Mode’ button again.

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