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Sudoku Up Rules Every Sudoku puzzle is a square of 81 cells in a 9x9 grid, divided into nine 3x3 subgrids.
Rules:
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Each empty cell must be filled using a number from 1 to 9.
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No horizontal row, vertical column or subgrid can contain two of the same number.
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Each puzzle starts with a set of numbers placed on the grid, that you cannot change.
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No mathematical operations are required. The game requires only logical skill and patience.
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