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Sudoku: Combinatorics, Puzzle, Will Shortz, Howard Garns, Asahi Shimbun, Pentomino, Heptomino, World Puzzle Championship, Kakuro, Verbal Arithmetic - Softcover

 
9786130356484: Sudoku: Combinatorics, Puzzle, Will Shortz, Howard Garns, Asahi Shimbun, Pentomino, Heptomino, World Puzzle Championship, Kakuro, Verbal Arithmetic

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid. Completed puzzles are always a type of Latin square with an additional constraint on the contents of individual regions. Sudoku was popularized in 1986 by the Japanese puzzle company Nikoli, under the name Sudoku, meaning single number. It became an international hit in 2005."

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