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Paradoxically, the extra constraint can sometimes make puzzles easier to solve!

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daily sudoku by krazydad 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. sudoku with no ads Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. sudoku with no ads Modern Sudoku was popularized by Nikoli in Japan in the 1980s. It has since become a global phenomenon, with daily puzzles appearing in newspapers and online platforms worldwide.

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