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??t you know Sudoku? Sudoku is a placement puzzle, also known as Number Place in the United States.
The aim of the puzzle is to enter a number from 1 through 9 in each cell of a grid,most frequently a 9×9 grid made up of 3×3 "regions", starting with various numbers given in some cells (the "givens").
Each row, column and region must contain only one instance of each number.
The first time you ee t...