How to play Signal
Play Signal, a free Lights Out puzzle: tap cells to flip them and their neighbors until every lime signal goes dark. Levels, hints, and lifelines — no sign-up.
- Every cell is either lit (lime) or dark.
- Tapping a cell flips it and the cells directly above, below, left and right of it.
- Turn every lime signal dark to clear the level. Order matters less than choosing which cells to press.
- Stuck? Use a hint to see a useful next move, or a lifeline to recover.
Free, no account, no ads. Progress and best scores stay in your browser's local storage. Add ?daily=1 to the URL for today's shared daily board.
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