from Simon Tatham's Portable Puzzle Collection
doesn't provide a feature that the puzzle code requires (such as
These puzzles have been successfully run in Firefox 19, Chrome 26,
Internet Explorer 10 and Safari 6.
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
to mark it with a
/. Keep clicking in a square to
cycle it between
/ and empty.
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