Turn off a 4×4 light board by flipping cross-shaped groups. Plan your taps in this untimed, medium logic puzzle.
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Tap any square to flip it and its immediate neighbors above, below, left and right.
A lit square turns off and an unlit square turns on. Diagonals are never changed.
Make every square dark to finish. You may tap dark squares as well as lit ones.
Undo move restores the previous board and counts as another move. New puzzle starts a different board.
Lights Out is a compact puzzle about overlapping effects. A move that fixes one square may change three others, so looking only at the brightest light can be misleading. Our medium boards are drawn from solvable states with shortest solutions of four to six taps. The lit-circle and off-dot markings keep the state visible without relying only on color.
Your result is the total moves taken to turn every light off; lower is better. Every tap and undo counts once. There is no timer. Only solved boards are saved, and different starting boards may require different numbers of moves.
More about your scores →Tapping the top-left corner flips exactly three squares: that corner, the square to its right, and the square below. The diagonal square is unchanged. Tap the corner again and those three squares return to their earlier states.
A light changes only if it is flipped an odd number of times. Two overlapping taps can cancel on one square while changing other squares around it.
A tap directly below a light affects that light. Working downward can clear earlier rows, but you may need to revise your first-row choices if lights remain at the bottom.
A corner affects three squares, an edge four, and an interior square five.
Tapping the same square twice cancels its effect, but still uses two moves.
Work from the top row downward: a tap in the row below can switch off a light above it.
Results describe this game session. They are not IQ scores, diagnoses or clinical assessments.
For the final board, no: tapping the same collection of squares has the same combined effect in any order. Intermediate boards can look very different.
Yes. Starting states are generated from the all-off board and checked to have shortest solutions of four to six moves.
No. Sometimes an unlit square is the useful move because it changes several lit neighbors.
Never. The pattern is a cross clipped by the edges of the 4×4 board.
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