Fill in the grid with a pattern of black and white squares, so that the numbers in each row and column match the lengths of consecutive runs of black squares.
Left-click in a square to mark it black; right-click to mark it white. Click and drag along a row or column to mark multiple squares black or white at once. Middle-click to return a square to grey (meaning undecided): dragging like that can erase a whole rectangle, not just a row or column.
Courtesy of Simon Tatham's Puzzle Collection via the MIT license.
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