Lights OutFree, no sign-up
Pressing a square toggles it and the lights above, below, left and right. Turn them all off. The board changes at midnight Japan time (UTC+9) and is the same for everyone on the same day and size.
🎉 All lights out!
Random practice runs are not added to the leaderboard.
FAQ
What are the rules of Lights Out?
Pressing a square switches it and its neighbors above, below, left and right between on and off. Turn every light off to win.
Is every board solvable?
Yes. Today's board is made by starting with every light off and pressing a few squares, so it can always be cleared. Pressing the same square twice undoes it, so the trick is to think only about whether to press each square or not.
Any solving tips?
The basic method is "chasing the lights": going row by row from the top, press the square directly below each lit light to turn it off. The pattern left in the bottom row tells you which squares to press in the first row.
How is the leaderboard ranked?
By time, fastest first; ties go to fewer presses. You only need a nickname, and you can submit up to 30 times a day per size. The server verifies the squares you pressed.