Lights Out
by ArcadeLabThe classic Lights Out puzzle, fully playable in the browser. Tapping a light toggles it and its four orthogonal neighbors; the goal is to switch every light off. Every board is generated by applying random valid presses to a solved grid, so it is always guaranteed solvable — a tidy, satisfying puzzle with a surprising amount of mathematics underneath.
Frequently asked
How do you play Lights Out?
Tap any light and it flips on or off along with its up, down, left, and right neighbors. You win when every light on the board is off. It takes planning, because each move affects several cells at once.
Is every puzzle solvable?
Yes. Each board starts fully solved and is scrambled by a series of random valid presses, so a solution always exists — you just have to find it. Press order does not matter, which is a neat property of the puzzle.
Can I build and share a puzzle game like this?
Yes. Lights Out is a single self-contained HTML file. ArcadeLab lets kids and creators publish browser games by pasting their HTML at arcadelab.ai/publish — no signup, no build tools.