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nytimes.com sudoku Advanced Sudoku solving methods involve complex patterns like X-Wing, Swordfish, and XY-Wing. These techniques are often required for hard and expert level puzzles. how many sudoku puzzles are there Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. dark sudoku Advanced Sudoku solving methods involve complex patterns like X-Wing, Swordfish, and XY-Wing. These techniques are often required for hard and expert level puzzles.
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nytimes.com sudoku Common Sudoku Mistakes and How to Avoid Them
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