300 Medium to Hard Sudoku Puzzl by Allen, Randy, ISBN 1717330401, ISBN-13 9781717330406, Like New Used, Free shipping in the US Sudoku craze and pairs the addictive logic-based game with a spectacularly handy format. Filled with 300 grids of varying difficulty, our Sudoku is perfect for strategizing on the bus, train or Plane. Now that's what we call a smart calculation!Medium to Hard Sudoku Puzzl
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