Singles

from Simon Tatham's Portable Puzzle Collection

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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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