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printable hard sudoku puzzles Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9. sudoku seattle Sudoku variants like Killer Sudoku, Jigsaw Sudoku, and Sudoku-X provide additional challenges for players looking for something different from the classic version. cross hatching in sudoku Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible.

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