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(Paperback)
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October 04, 2009: The title actually fits this book! I am an avid Sudoku fan and this one and the whole series makes me squirm and even use an additional sheet of paper to solve these. Truly Mensa level. Not a morning or night puzzle, this takes much more time!
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June 28, 2009: Longo is the most consistent sudoku puzzlemaster out there. The puzzles are appropriately difficult. The spiral binding is also very convenient.