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Hard
Lights #731 · 7×7
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- 7×7board
- 32lights on
- 18presses to solve
- 49cells
Lights #731 is a 7×7 board at hard level. It starts with 32 of its 49 lights on, and the one solution needs 18 presses.
Row 5 is the brightest, with 6 lights on. If you chase from the top, that is where most of the work happens.
2 corner lights are on. A corner light has only two neighbours, so it is changed by just three presses: itself and the two lights next to it.
With 18 presses in the solution, chasing from the top down and fixing the first row from what is left at the bottom is safer than trying to see the answer at once.
Hard 7×7 boards need a full chase, often twice. Keep count: pressing the same light twice cancels out.