Games and Puzzles
Sudoku is a logic-based, combinatorial 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 squares that compose the grid contains all of the digits from 1 to 9.
Sudoku is an easy to learn logic-based number placement puzzle. The word Sudoku is short for Su-ji wa dokushin ni kagiru which means "the numbers must be single".
The roots of the Sudoku puzzle are in the Switzerland. Leonhard Euler created "carré latin" in the 18h century which is similar to a Sudoku puzzle but without the additional constraint on the contents of individual regions. The first real Sudoku was published in 1979 and was invented by Howard Garns, an American architect. The real world wide popularity started in Japan in 1986 after it was published and given the name Sudoku by Nikoli.