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Light Switch #841

#841 · Oct 21MediumArchive: not ranked

How to play

Pressing a square switches it and the squares directly above, below, left and right of it.
Lights that were on go off, and lights that were off come on. Turn every light off.
Par is the fewest presses that can clear today’s board. Pressing a square twice cancels it out.
Fewest presses wins, then the fastest time.

Light Switch #841 is the puzzle from Wednesday, October 21, 2026 (medium). Archive puzzles count toward your statistics, not your streak or the leaderboard.

Archive games count toward your statistics, not your streak or the leaderboards.

About Light Switch #841

Light Switch #841 was the puzzle for Wednesday, October 21, 2026, a medium one: 13 lights on, 7 presses at best. Everyone who played Light Switch that day got the same puzzle, and it stays here to play for 60 days.

New to Light Switch? The rules, tips and common questions are on the Light Switch page, and Light Switch Guide: Chase the Lights to Zero goes into strategy.

Other days of Light Switch

Every day of the last 60 is in the puzzle archive.

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