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Fill in a diagonal line in every grid square so that there are no
loops in the grid, and so that every numbered point has that many
lines meeting at it.
Left-click in a square to mark it with a \; right-click
to mark it with a /. Keep clicking in a square to
cycle it between \, / and empty.
Full instructions
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(last modified on Mon Mar 9 01:42:11 2026)