This Sadistic Sudoku Puzzle Book is a great gift for Adults, Teens and Kids. Extreme 16 x 16 Sudoku puzzles are a fun and addicting logic puzzle game that have become very popular in the last decade. This book is ideal if you are a Sudoku expert or just someone wanting to stimulate their brain daily. In this book, you will find some of the hardest 16 x 16 sudoku puzzles. There are 55 puzzles in this perfect sized 6x9 book that will keep you busy for days!. Once you pick up this book, you won't be able to put it back down. This book is the perfect size for traveling so feel free to take it on the go with you! Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku and Soduku. Quick Creative's Version of Extreme Sudoku Puzzle Book 55 HARD 16 x 16 Puzzles includes: 55 Hard Sudoku 16 x 16 puzzles Answer Pages Hours of Fun Solution Pages Larger Print One Puzzle Per Page Search the author name Quick Creative above for more extreme Sudoku Versions from Easy to Extra Hard and 9x9 or 16x16. There are multiple versions in this series so make sure to grab the entire series to keep your brain stimulated! Perfect stocking stuffer for men, birthday gifts for women or a great gift for under $10.