Master Sudoku with this Comprehensive Guidebook. The addictive Sudoku puzzle has captivated millions of people across USA, UK, Australia, India and other countries. This book is intended to help a beginner understand the puzzle and learn how to solve it. Those already conversant with Sudoku will discover a variety of secret tools and strategies to crack even the toughest puzzles with ease. The 100-plus puzzles in this book offer different levels of difficulty for "puzzles buffs" to crack. In addition, you get a chance to join the Sudoku Lovers Club, a worldwide community of Sudoku enthusiasts and share puzzles, techniques and strategies.