Neilande, Alina Sudoku Puzzle Book from Classic to Creative: Volume 2 Sudoku Puzzles with Solutions Easy to Expert 18 Grid Types For Adults and Seniors For relaxing activity (Sudoku Universe)

Drab, Richard Sudoku Puzzle Book for Seniors Volume 2: Large Print, Extra Large Grids 100 Sudoku Puzzles from Easy to Hard with Solutions (Sudoku Puzzle Book for Seniors – Large Print Series)

McDuffee, M Sudoku Mind Boosters-Gentle Puzzles to Enhance Cognition: 800 Easy Level Puzzles Volume 2: 8.5x11 Glossy Cover: Solutions to the puzzles on the back of the book.

Puzzle Press, McDuffee Sudoku Trek Puzzle Book-Beginner Grids for Skillful Exploration: 1200 Easy Level Puzzles Volume 2: 8.5x11 Glossy Cover: Solutions Included.

Neilande, Alina Sudoku Puzzle Book from Classic to Creative: Volume 2 Sudoku Puzzles with Solutions Easy to Expert 18 Grid Types For Adults and Seniors For relaxing activity (Sudoku Universe)

Neilande, Alina Sudoku Puzzle Book Easy to Expert: Volume 1 Sudoku Puzzles with Solutions Easy to Expert 12 Grid Types For Adults and Seniors For Daily Brain Activities (Sudoku Universe)

Croker, Dan Famous Frog Sudoku 2,000 Hard Puzzles With Solutions: Largest Sudoku Puzzle Book Ever With Only One Level Of Difficulty. No Wasted Puzzles. Great Gift ... Enthusiasts!: Volume 20 (Bathroom Sudoku)