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- Singles
- <p>
- Black out some of the squares, in such a way that:
- <ul><li>no number appears twice in any row or column
- <li>no two black squares are adjacent
- <li>the white squares form a single connected group (connections
- along diagonals do not count).</ul>
- <p>
- 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 <em>not</em> be blacked out.
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