Logic 5 × 5 grid
Lights Out
Switch off every light on the board.
RANDOM OR DAILY
Try a random board, or play the same daily puzzle as everyone else. Dates use UTC and your device’s clock.
Getting your game ready…
YOUR ROUND
SEE THE RULE IN ACTION
One tap, five changes
The center and its four neighbors are lit. Tapping the center flips all five.
This is a separate example. Trying it does not change your game or saved progress.
Do corners work differently?
The same rule applies, but a corner has only two neighbors. A tap there changes three squares in total.
Can every puzzle be solved?
Yes. We create boards by applying legal taps to an all-dark board. Reversing those taps solves the puzzle.
What makes the daily puzzle different?
Each UTC date has one fixed starting board. The link includes its date and rules version. Your device’s clock selects today; a dated link keeps that puzzle. Ordinary progress is saved separately.