This is a massive 9 x 9 Sudoku puzzles book of varying difficulty levels, expertly crafted and graded. You will Love this Sudoku Puzzle Book. You can spend hundreds of fun hours with this book. These Sudoku Puzzles are great for any Sudoku lovers. Each puzzle is designed and assessed for consistency. This book does not dump too many puzzles in one page, instead it provides two well-crafted puzzle on each page so that it is not overwhelmingly too many. Less puzzle on each page also make it easier on the eyes and less distracting while solving a puzzle. It helps you concentrate more. Each puzzle has a "Note" section adjacent to it where you can have your calculations or thoughts written down. Large print is great for seniors. Better and bigger fonts than any newspaper or magazine. To reiterate, there are 400 Sudoku puzzles (9X9) to enjoy in this big book of Sudoku, with 2 different levels of difficulty, which makes it suitable for intermediate, advanced, and expert Sudoku players in love with this super addictive game. This book has: 200 Medium puzzles for intermediate players or as a warm up for experts 200 Hard problems which will give your brain a real challenge The book has varying levels of difficulty to choose from! It is easy to tear off a page if needed to This Sudoku Puzzle book is: Well suited for intermediate, advanced, and expert level. Great activity for frequents travelers and travel lovers. No more getting bored in transit, long flights, buses, or trains. This can be used as a great brain teaser for the self-quarantined and introverts. Great for virtual meeting activity, Zoom meeting activity, lunch meeting activity, virtual socialization. Great gift for any occasions such as Christmas, New Year, Thanksgiving, Birthday. Great for colleagues, friends, and family. An awesome gift for any get-together. Sudoku puzzle books make a wonderful gift. Give this puzzle book as gift to your loved ones. A perfect family activity during the holiday season or any family gatherings such as wedding, baby shower, or friends' night over. Get a copy for each friend or family member and compete to see who gets to solve the puzzles first. Perfect for end of school year gift for teachers or students. So, what are you waiting for? Get this book and start solving.