Sudoku
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Sudoku is a logic-based, combinatorial number-placement puzzle. In classic Sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that
From La France newspaper, July 6, 1895: The puzzle instructions read, "Use the numbers 1 to 9 nine times each to complete the grid in such a way that the horizontal, vertical, and two main diagonal lines all add up to the same total."
Sudoku board game with two-sided black-red tiles
The world's first live TV Sudoku show, held on July 1, 2005, Sky One
Latin square
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In combinatorics and in experimental design, a Latin square is an n × n array filled with n different symbols, each occurring exactly once in each row and exactly once in each column. An example of a
Sudoku
…Glossary of Sudoku. This section refers to classic Sudoku, disregarding jigsaw, hyper, and other variants. A completed Sudoku grid is a special type of Latin square with the additional property of no repeated values in any of the nine blocks (or boxes of 3×3 cells). The general problem of solving Sudoku puzzles on…
Displaying a 7 × 7 Latin square, this stained-glass window at Gonville and Caius College, Cambridge, honored Ronald Fisher, whose Design of Experiments discussed Latin squares. The Sir Ronald Fisher window was removed in 2020 because of Fisher's connection with eugenics.