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About the Author Publications International, Ltd. US Amazon StorePublications International, Ltd. (PIL) publishes books and products for kids and adults in many categories: reference, leisure, inspirational, automotive, sports, cookbooks, stationery (New Seasons), interactive and early learning (Little Grasshopper Books). Product Description This sudoku book is sure to keep puzzlers of all experience levels busy for hours on end.Includes more than 160 puzzles.5 levels of difficulty.Each puzzle is on a full page, solving is easy on your eyes.Sudoku puzzles are fun and engaging, while providing your brain with a little stimulation! Spiral bound, 192 pages.