The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9 9 grid made up of 3 3 subgrids called regions, starting with various digits given in some cells the givens. Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. Although first published in a U.S. puzzle magazine in 1979, Sudoku initially caught on in Japan in 1986 and attained international popularity in 2005.
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