The Jumbo Book of Killer Sudoku — Intermediate to Hard: 600 Huge Puzzles — 6 Levels: Linklater, Felix: 9798408032211: Amazon.com: Books
Sudoku Jumbo Puzzle Game Book Educational Learn School 256 Pages Challenge | eBay
Eberhard Krüger: Sudoku für Könner 19 (5 Exemplare à 2,99 €) - Paperback - Bassermann Verlag
1000 Sudoku Puzzle Books: 1000 sudoku puzzles easy to hard Jumbo Puzzle Books - 4 diffilculty - Easy Medium Hard for Beginner to Expert - Brain ( Large Print / Paperback) | Schuler Books
SUDOKU Expert: Jumbo 300 expert SUDOKU puzzle books with solution Brain Games Puzzles Books for Expert Adult and Senior (hard sudoku (Large Print / Paperback) | Trident Booksellers & Cafe