Extreme Sudoku: A Collection Of 200 Of The Toughest Sudoku Puzzles Known To Man. (With Their Solutions.)

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This book contains a selection of 200 of the hardest and most difficult Sudoku puzzles along with their solutions. These puzzles were selected among 17-clues Sudoku puzzles for their especially challenging nature and will provide hours of enjoyment and ample opportunity to practice the most advanced Sudoku resolution techniques.


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