Jigsaw Sudoku is Sudoku with a twist. Instead of square shaped regions, the regions are irregularly shaped. This makes solving a Jigsaw Sudoku puzzle that little bit more difficult than classic Sudoku. This book is ideal if you love to solve difficult Jigsaw Sudoku 9x9 puzzles. In this book, you do not need to wade through easy Jigsaw Sudoku puzzles before getting to the real brain teasers. Once you pick up this book, you won't be able to put it back down. You have been warned!Jigsaw Sudoku 9x9 - Hard is a collection of 276 puzzles: 216 hard Jigsaw Sudoku 9x9 puzzles 60 extra logic puzzles I guarantee that every logic puzzle in this Jigsaw Sudoku puzzle book has been carefully checked to ensure that each puzzle has only 1 solution.None of the puzzles in this book will appear in any of the other PuzzleBooks.net books.Jigsaw Sudoku is also known as Geometry Sudoku, Irregular Sudoku, Squiggly Sudoku and Kikagaku Nanpure.