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Gluttons for punishment rejoice! The popular series of ultra-hard sudoku is back. Just when it seemed safe to go back into the puzzle section of the bookstore ... here comes another collection of the hardest sudoku known to humankind. The newest four volumes of this bestselling series range from Level 1 to Level 4, increasing in difficulty as they go. In Level 2, solvers will encounter 242 puzzles that incorporate more advanced techniques than Level 1. After the book is complete, two more levels remain to conquer!
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The New York Times on the Web Crosswords for Teens
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