Instead of normal numbers we used letters in this book to give you a new challenge! Challenge your brain with these 100 extremely hard Sudoku puzzles. They are suitable for Sudoku experts and and make a great gift! Also great for traveling due to the smaller size.Puzzles are printed in large print, so they are easy to read and to write in. Product details: 100 extremely hard Sudoku puzzle with lettersOne puzzle per page!Large Print: Easy to read and to write inSolutions are included at the end of the bookSmall size: 6 x 9 inShiny, flexible and durable coverWe from "Sharpened Pencil Press" love puzzles in all forms and sizes to keep our brains active and happy. We hope you enjoy our books and have much fun solving them! Check out our other Sudoku and puzzle books!