R. F. · Robert F. · Robert M. Fuhrer
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Kendoku 2010: 100 Perplexing Puzzles | 978-1-934734-51-3 | 2010 | David Levy |
| Kendoku: Extreme: 150 Brutal Puzzles to Build Your Brain | 978-1-934734-18-6 | 2010 | " |
| Kendoku: Hellaciously Hard: 100 Beyond Brutal Puzzles to Build Your Brain | 978-1-934734-46-9 | 2014 | " |
| Kendoku: The Next Logical Step | 978-1-934734-14-8 | 2009 | " |
| Kendoku: Volume 2: The Next Logical Step | 978-1-934734-15-5 | 2009 | " |