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In the 19th century, mathematician Henry Dudeney became fascinated with Latin Squares and started creating variations of them. sudoku.io Understand the rules Before you start solving Sudoku Medium puzzles, make sure you're familiar with the rules. most difficult sudoku ever
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sudoku.io 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. printable hard sudoku puzzles Sudoku variants like Killer Sudoku, Jigsaw Sudoku, and Sudoku-X provide additional challenges for players looking for something different from the classic version.
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