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Look for rows, columns, or subgrids where certain numbers can't possibly fit because they would violate the Sudoku rules. washington post sudoku Here's how to identify and use them: Pairs: Look for rows, columns, or boxes where two cells have only two possible numbers left. sudoku difficile Focus on rows and columns: Start by filling in numbers in rows and columns, as this will help you identify patterns and potential duplicates. super hard sudoku
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