Lights Out

Pressing a tile flips it and the tiles above, below, left and right of it.

Par is the fewest presses that solve the puzzle. Match it for three stars.

Easy, Normal and Hard set how high par can be: Hard boards need more presses.

Hint lights up a tile from the shortest solution, but it costs a star.

Every puzzle can be solved. Pressing a tile twice undoes it, so order never matters.

Keyboard: arrows move, Space or Enter presses, U undo, H hint, R restart, N new, 3–7 board size, D difficulty.

LIGHTS UT