Link to this puzzle:
by game ID (longer, more stable)
by random seed (shorter, less stable)
Black out some of the squares, in such a way that:
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.
Courtesy of Simon Tatham's Puzzle Collection via the MIT license.
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