Sudoku is a number-placement puzzle that consists of a 9x9 grid divided into nine 3x3 subgrids called "boxes," "blocks," or "regions." The objective is to fill the grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9. cardgames io sudokuwhere to buy sudoku books Remember to follow the rules: each row, column, and 3x3 subgrid must contain all digits from 1 to 9.
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