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Controls
- Press
- Click or tap · arrow keys and Space
How to play
Pressing a light toggles it and the lights above, below, left and right of it. Switch every light off. Each level needs more presses; par is the fewest possible.
The ruleA press toggles that light and the lights directly above, below, left and right of it. Order never matters, and pressing the same light twice undoes it.
ParPar is the fewest presses that can clear this board, worked out by solving the puzzle as a system of equations (mod 2). Every level is built from a solved board, so it is always solvable.
A strategy"Chase the lights": clear each row by pressing the light directly below every lit one, working down. The pattern left on the last row tells you which top-row lights to press before chasing again.
1 player · Mouse · Touch · Keyboard
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