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Objective / Rules - Find all of the Black squares. - Each of the squares must be Black or contain an X. - Beside each row/column are listed the lengths of the runs, in order, of the Black squares in that row/column.
Mouse Usage Left-click = Blank >> Yes >> No >> Blank. Right-click = Blank >> No >> Yes >> Blank. You can also click and drag.
Checking If you click 'Check' the system will check for incorrect squares. If 'Show mistakes when checking' is checked their borders will be marked in red.
Uniqueness Each puzzle has exactly one solution, which can be found using logic alone and no guesses are ever required. If you think you've found another solution, then please double check the rules.
[Unique Reference = Nonogrids-1011-20x20-812036]