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Direct from the Publisher. Pit your wits against some of the most difficult Sudoku puzzles ever created! In this series you'll find over 50 puzzles in each book featuring 16 x 16 grids, most to be filled with numbers, and some with letters. See if you are up to the challenge and Order Yours Today! (Magazines are back issues shipped together in one package. Multiple value-pack orders may contain duplicate magazines.) To assist with delivery to institutions be sure the recipient ID follows the last name and check institution policy on number of books allowed in a shipment.