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Sudoku is a logic-based, combinatorial number-placement puzzle game. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contains all of the digits from 1 to 9. The game is completely free with minimum ads. Sudoku master is one of the best Sudoku game and you can download it for free(sudoku game free download).