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very hard sudoku puzzles 9x9 Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. sudoku swordfish examples 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. sudoku matematico 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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