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.
Black out some of the squares, in such a way that:
- no number appears twice in any row or column
- no two black squares are adjacent
- the white squares form a single connected group (connections
along diagonals do not count).
Click in a square to black it out, and again to uncover it.
Right-click in a square to mark it with a circle, indicating that
you're sure it should not be blacked out.
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