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Lights Out
Turn off all sixteen lights. Each press changes the selected light and its horizontal or vertical neighbours.
Spatial logic · no account needed
How to play
Click a square to change that light and each immediately adjacent light (up, down, left and right). Lit lights turn off; dark lights turn on. The aim is to make the entire grid dark.
Every new board is made by applying legal moves to an all-off board, so at least one solution exists. The hint identifies a move in a valid solution from the current position.