Sudoku Insane & Inhuman: Killer Sudoku Puzzles for Advanced & Experienced Players - Extremely Hard to Hardest for Experts

SUDOKU FOR ADULTS | 7” x 10” TRIM SIZE | 138 PAGES | TWO SEPARATE LEVELS OF DIFFICULTY FOR EACH BOOK IN THE SERIES | SUITABLE GIFTS FOR PEOPLE WHO LOVES SUDOKU PUZZLES This book features:138 pages on white paperSize of book – 7” x 10”Non-spiral boundSoft and sturdy coverThis book is part of a series that are available in separate volumes with different difficulty levels (ratings) to meet the needs of the full range of Sudoku players. Books available include the following: Vol. 1 ISBN: 9781704022864 (Easy & Medium)Vol. 2 ISBN: 9781704024851 (Hard & Difficult)Vol. 3 ISBN: 9781704026039 (Insane & Inhuman)The books can easily be located using the ISBN numbers provided. Just type (or copy & paste) the numbers onto the Amazon search bar and you would be able to find the books.