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Synopsis: This is a book of difficult Sudoku puzzles. Some of the puzzles require you to apply advanced Sudoku solving techniques such as X-Wing or Swordfish.
However, all puzzles can be solved without guessing and have one solution only. If you need help, you can always peek at the solutions.
Remember: do not guess!
The book is small in size but the numbers are printed in large font, easy to read.
All puzzles in this book are NEW, previously unpublished!
Title: Difficult Sudoku Book: 200 Difficult Sudoku ...
Publisher: CreateSpace Independent Publishing Platform
Publication Date: 2015
Book Condition: Good
Book Description CreateSpace Independent Publishing Platform. Paperback. Condition: Brand New. This item is printed on demand. Seller Inventory # zk151411786X