Extremely Hard Sudoku Puzzle Book, 16x16

Warning: Extremely Difficult 16x16 puzzles. You might not be able to complete some of these. If you are already Very Good at typical hard 9x9 or 16x16 sudoku and want to Really Challenge yourself, then this book is for you. This book is designed to induce frustration and brain cramps. If this happens to you, then we have done our job :-) ISBN: 9781953383082 These are brand new books shipped directly from the publisher. Shipping & Handling: A flat fee of $5.00 covers the shipping for 1 - 3 books ordered from this seller in the same transaction. Feel free to mix and match the books you order. Orders ship from Indiana and will have tracking numbers provided.