Singles

from Simon Tatham's Portable Puzzle Collection

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.

Full instructions | Back to main puzzles page