Enjoy this Sudoku Sampler to stay sharp and have fun! You won't be able to tuck this 8.5" x 11" book in your pocket, but you can slip it in your briefcase, carry-on or beach bag and relax with a puzzle in your spare moments. One big puzzle on each page gives you plenty of space to note candidates and sturdy paper holds up well to erasing. Large print on white paper is very easy to read (even by campfire light). Each puzzle has one solution - provided at the back of the book. Go ahead and peek if you get stuck or want to verify your answer. Advance from easy to very difficult puzzles as you improve and gain experience. Share this book on road trips with family and friends who like different puzzle levels. Get more than one book and arrange a friendly challenge! Contains 60 Easy, 60 Medium, 60 Hard and 30 Very Difficult puzzles. Sample these four popular difficulty levels to find the ones you prefer. If you were misled by other books with impossible Sudoku puzzles labeled "easy" or beginner puzzles called "moderate," we feel your frustration. What is "easy" for one person can be a serious challenge for another. Because there is no official Sudoku grading standard, you have no way to compare puzzles from different authors. For example, an easy puzzle in a book is often called moderate or hard in a newspaper, and categories are not precise. Which do you think is more difficult, an evil, fiendish, extra-hard, devilish, black-belt, nasty, extreme or expert puzzle? To help you confidently select puzzles at the level you want, Puzzle Books Plus is committed to using a consistent grading standard for Sudoku books by Kat Andrews. We determine difficulty by the logic techniques needed to solve the puzzle. Look inside the book to see a mapping of logic technique to puzzle difficulty.