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💡 Lights Out

Switch every light off. The catch: pressing a light also flips the ones above, below, left and right of it. Every puzzle can be solved — the trick is working out how.

Moves0
Still on0
Best—

Turn every light off!

Size

How to Play

The rule
Press any square and it flips — on becomes off, off becomes on. So do the squares directly above, below, left and right of it. Corners and edges just flip fewer neighbours.
Winning
Every single light off. That's it.
Order doesn't matter
You can make the same presses in any order and end up at exactly the same board. And pressing the same square twice is the same as never pressing it at all — so if you're going round in circles, you may be undoing your own work.
Stuck?
💡 Hint highlights one square that genuinely still needs pressing. It doesn't cost you anything except a slightly higher move count.
Every puzzle can be solved
Not every pattern of lights can be turned off — so puzzles are built backwards, starting from an all-off board and pressing random squares. Whatever presses made the puzzle will unmake it.
Tip
Work top to bottom. Clear the top row by pressing the squares in the row underneath each light that's still on, then repeat. It's a surprisingly powerful trick once it clicks.