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Authors: Frank Longo
ISBN-13: 9781402737176, ISBN-10: 1402737173
Format: Paperback
Publisher: Puzzlewright
Date Published: November 2005
Edition: (Non-applicable)
And puzzlers who have completed the first level of sudoku can graduate to these more second-degree puzzles. White and Green belts can keep honing their skills, while Brown and Black will get a new and greater challenge!