The Chaos Coordinator's Sudoku Book: Large Print Sudoku Puzzles for Mom - 200 Games with Floral Background from Easy to Hard - Mother's Day Gift Idea (Paperback)
Hard to Extreme Jigsaw Sudoku - 300 Challenging Puzzles - Volume 3: Hard, Very Hard and Extremely Hard Irregularly-Shaped Sudoku Puzzle Book for Adult (Paperback)