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dog sudoku Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. where did sudoku originate Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible. solving hard sudoku There are several difficulty levels in Sudoku, ranging from easy for beginners to expert for seasoned players. Solving techniques include scanning, cross-hatching, and identifying candidate numbers.

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