What is SUDOKU?
Sudoku is a placement puzzle. Originated in the US with the name of Number Place in an American Magazine. First published in the United States, Sudoku (meaning single number in Japanese) initially became popular in Japan in 1986 and attained international popularity in 2005.
How do you play SUDOKU?
The aim of the puzzle is to enter a number from 1 through 9 (or a letter from A to I) in each cell of a 9×9 grid made up of 3×3 sub-grids (called "regions"), starting with various numbers (or letters) given in some cells (the "givens"). Each row, column and region must contain only one instance of each number (or letter). Completing the puzzle requires patience and modest logical ability (although some puzzles can be very difficult).