This book contains 512 SUDOKU puzzles of varying difficulty, meant to take you to a journey of discovery and eventually mastery of this century's most addictive game. There are plenty of puzzles for you to enjoy: There are 128 EASY, 128 MEDIUM, 128 HARD and 128 EXTREME puzzles, if you want a real challenge. Whatever you´re looking for, there´s something for you in this Sudoku Book. Good luck and play! Keep your brain fit, young, and flexible!  Large print on white paper is very easy to read  Instructions and solving techniques for beginners are included Each puzzle has one solution - provided at the back of the book. Extra wide center marginsmake it easier to solve the puzzles when you fold the book back, or if you want to tear out the pages. You will also get another 100 Sudokus and extended solution techniques as a bonus for download In this series, books are also available in the difficulty levels: Easy, Medium, Hard and Extreme