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printable sudoku hard Use the "X-Wing" Strategy: When two rows or columns have two cells with the same two numbers, these numbers can only appear in those cells. free sudoku with answers Look for Hidden Pairs and Triples : Sometimes, pairs or triples of numbers can be hidden within a row, column, or box. andrew stuart sudoku Apps for Sudoku Lovers: If you prefer using a mobile app to solve Sudoku puzzles, here are some popular ones: a. free sudoku with answers For example, if you see three cells in a row with the numbers 1, 2, and 3, and no other 1, 2, or 3s in that row, you have identified a triple.
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