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sudoku cb In our puzzle, the middle row has only one cell that can be filled with a 7, as it's the only number not already present in that row, column, or subgrid. free sudoku app no ads Each puzzle consists of a 9x9 grid divided into nine 3x3 subgrids, also known as "boxes." The objective is to fill the grid with numbers 1-9 so that each row, column, and box contains all the digits exactly once.
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