Do you dare challenge the Sudoku Ninja?This book contains 200 puzzles in all levels. 50 easy puzzles, 50 medium puzzles, 50 hard puzzles, and 50 very hard puzzles.In each level category each puzzle gradually increases your playing level by gradually increasing the difficulty.So whether you are looking to hone your personal Sudoku puzzle skills or to just play with family or friends this book will surely provide hours of fun while challenging your brain.There are 5 books in this Sudoku Puzzle Book All Levels Series, each book containing 200 puzzles.