Title: The Unforgiving Sudoku Puzzle Book, Author: James St Arnold
Title: Retro Sudoku: Vintage Vibes. Modern Minds. Over 1000 Sudoku Challenges to Keep You Sharp & Chic., Author: E Mckenzie
Title: Opulent Logic: Enjoy over 1000 easy and medium Sudoku puzzles - refined, stylish, and wrapped in a world of high fashion and logic., Author: E Mckenzie