A Jigsaw Sudoku puzzle is similar to a Sudoku puzzle except that the square 3X3 boxes are replaced by irregular shaped regions. So, like a regular Sudoku, you have to place all the numbers from 1 to 9 once, in each column, row, and irregular region. By breaking the monotonous series of identical square boxes, the Jigsaw Sudoku brings a new and varied challenge. Each puzzle in this book has a unique shape, different from all the others. So you cannot apply exactly the same resolution pattern two times. This diversity should delight the most-bored Sudoku addict. This book contains 160 puzzles, sorted in increasing difficulty, but all are fun. So, don't wait Take the challenge and enjoy