- David Karn Sudoku - Hard to Extreme Vol 2: 102 Puzzles, Extra Large Print, 42 pt font size, 1 puzzle per page
- David Karn Sudoku - Medium to Hard Vol 2: 100 Puzzles, Extra Large Print, 42 pt font size, 1 puzzle per page
- David Karn Sudoku - Medium to Hard Vol 1: 100 Puzzles, Extra Large Print, 42 pt font size, 1 puzzle per page
- David Karn Easy Large Print Sudoku Puzzle Book for Grandpas: 120 Puzzles With Solutions - Improve your memory, delay dementia, reduce risk of Alzheimer's - 36 pt font size, 1 puzzle per page
- David Karn Easy Large Print Sudoku Puzzle Book for Seniors: 120 Puzzles With Solutions - Improve your memory, delay dementia, reduce risk of Alzheimer's - 36 pt font size, 1 puzzle per page





























