Sudoku

Sudoku (Japanese: 数 独, sudoku) is a pastime that was published for the first time in the late 1970s and became popular in Japan in 1986, becoming known internationally in 2005 when many newspapers began to publish in his hobbies section. 1 The aim of sudoku is to fill a grid of 9 × 9 cells (81 boxes) divided in subgrids 3 × 3 (also called "boxes" or "regions") with the numbers 1 to 9 based on some numbers and arranged in some of the cells. Although you could use colors, letters, figures, it is agreed to use numbers for clarity, what matters is that they are nine distinct elements, which should not be repeated in the same row, column or subgrid. A sudoku is well posed if the solution is unique. Solving a sudoku is always a Latin square, but the reciprocal is not generally true because the sudoku provides the added restriction that they can not repeat the same number in a region.

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