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free sudoku puzzle solver Pay attention to the unique rectangles: In hard Killer Sudoku, there are often unique rectangles, which are regions that contain only four cells. giant sudoku Pay attention to diagonals that have the most numbers left to fill, as they are more likely to require your attention.
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A naked pair is a type of Sudoku technique that helps in solving the puzzle by identifying pairs of numbers that appear twice in the same row, column, or region. free sudoku puzzle solversudoku los angeles times The origins of Sudoku can be traced back to the 19th century, but it gained widespread popularity in the 21st century.
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