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X-Wing occurs when two rows or columns intersect at a pair of cells that can only be filled with two numbers. sudoku online hard Step 5: Use the "Pointing Pair" and "Box Line Reduction" Techniques The "pointing pair" technique involves identifying pairs of numbers in a row or column that point to the same cell in a different row or column. sudoku minimal So, the next time you sit down to solve a Sudoku puzzle, remember that you are not just entertaining yourself but also taking care of your brain. sudoku puzzles online free In 1984, it was introduced to Japan by Nikoli Co., Ltd., a puzzle company, and the name Sudoku was born. sudoku minimal
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