- 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 Sudoku - Medium to Very Hard Vol 1: 168 Puzzles, Travel Size, Regular Print, 24 pt font size, 2 puzzles 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
- David Karn Easy Large Print Sudoku with Flowers: 100 Puzzles With Solutions - A rose illustration on every page for grandmas, mothers, and flower lovers - 36 pt font size, 1 puzzle per page






























