This technique is called "single candidate." Check for Pairs and Triples: When two or three numbers are missing in the same row, column, or subgrid, they form a pair or triple. free printable sudokudoes sudoku have multiple solutions Use Advanced Strategies When you've mastered the basic strategies, you can try advanced strategies to solve difficult Sudoku puzzles: X-Wing: If two rows or columns have two cells with the same two numbers, and those two numbers appear in only those two rows or columns, the other two cells in those rows or columns must have those two numbers.
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