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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.