CH✦OSCHEMY

Lights Out puzzle game · The rune lamps Lights Out.

Press a rune lamp to flip it and the lamps above, below, left and right. Turn every light off.

Lighting the rune lamps…

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How to play Lights Out

Some rune lamps start lit. Pressing a lamp flips it, and also flips the lamps directly above, below, left and right of it: lit ones go dark and dark ones light up. Turn every lamp off to win.

Pressing the same lamp twice undoes it, and the order of your presses does not matter. Try chasing the lights: for each lit lamp, press the one directly below it, row by row, until only the bottom row is lit.

Every board here starts from a dark board with random presses, so it can always be solved. Par is the fewest presses possible.

How to play the Lights Out game online

Lights Out is a grid puzzle: a board of lights, some on and some off. Pressing a light switches it and its neighbors above, below, left and right, and the goal is to switch every light off. Here the lights are alchemy rune lamps, on a 3×3 board for beginners, the classic 5×5 Lights Out puzzle, or a 7×7 board for experts.

How do I solve it?

Chase the lights down. Starting with the second row, press the lamp under every lit lamp in the row above; that clears each row in turn, until only the bottom row is lit. The pattern left on the bottom row tells you which top-row lamps to press before you chase again.

Is every Lights Out puzzle solvable?

Not on every size: on a 5×5 board only one in four light patterns can be switched off. Every board in this game is made by random presses on a dark board, so it can always be solved, and par shows the fewest presses it takes.

For the full method, read the Lights Out guide. Stuck? Open your board in the Lights Out Solver to see the fewest presses from where you are.

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