• A worthy collection of 20000 Sudoku puzzles in 100 books (each book contains 200 standard 9x9 grids together with relevant solutions)
• 200 Puzzles for everyone with different Sudoku solving skills(for kids and adults)
• Four difficulty levels from beginners to advanced: 50 Simple, 50 Easy, 50 Intermediate, and 50 Expert
• 6 x 9-inch layout and Handy paperback format that you can take anywhere
• 2 puzzles per page
• Large print on white paper with enough margins to read and work easily by everyone from children to elders
• All puzzles have logical solutions
• Solutions of all Sudoku puzzle are included
• Keep you and your family busy with easy to hard puzzles (hours of fun and entertainment to enjoy with number replacement game)
• Learn and practice how to back and correct your mistakes to get success in real life with solving the puzzles
• a proper and fantastic gift for you and your lovely friends (applicable for adults and also children)
• Great challenging and tough puzzles(a fun mathematics gamebook)
• A high-grade brain teaser and booster to pass your free time(mental fitness activity book)
• Improve and test your skills on the popular logic-based replacement puzzle to become a master Sudoku Solver
• Relaxation and de-stress game book includes simple, easy, medium, and hard challenges
• An excellent problem-solving activities to boost your brain even in the journey, riding on the train or relaxing on vacation
• Sudoku puzzles solving is a good prevention method for Alzheimer's and Dementia.
• A great gift for the Sudoku puzzle lover
• The book is a collection of 200 puzzles to help keep your brain healthy, cognitively fit, flexible, and young
• Boost your brain function and keep it healthy with solving the logic-based number placement puzzles

Sudoku is easy to learn logic-based number placement puzzle and very popular all around the world. It is indeed a game for all ages: from kids in preschool to grown-ups. It is possible to form and solve a Sudoku puzzle with letters or even some symbols. A classic Sudoku puzzle is an 81-cell square grid made up of 3 x 3 sub-grids or 9 smaller blocks, also known as regions and boxes. Some cells already include numbers (called as givens). The game aims to fill all the blank cells with one digit from 1 to 9 in such a way without ever repeating a single one in the same row or the same column, or in the same block to solve it correctly.

We have designed 100 books including 20000 Sudoku puzzles in this series. You can also see more Sudoku puzzle books in our great "Sudoku Books Series - 100 books" under book name "Keep Your Brain Young: 512 Sudoku Puzzles - Simple, Easy, Intermediate, and Expert With Answers"

Have a nice journey and enjoy solving the puzzles!

Gholamreza Zare (Ghrzarea@gmail.com)
Pegah Malekpour Alamdari (PegahMalekpour@gmail.com)