This super collection of more than 250 sudokus promises hours of puzzling fun for the most ardent enthusiast, from the beginner to the seasoned expert. They're the perfect way to give your brain a workout too!Large format in slinky flexi binding.About the Author: Arcturus is a publisher of fine puzzle books for all the family. They use some of the best puzzlers around to create an eclectic assortment of subjects and difficulty levels in an ever growing range of puzzle types. If you are looking for a great value bumper package or for a beautiful and stylish designed book, Arcturus will have what you are looking for.