M M · Rick Smith Matt Mayfield
Cloud Kingdom Games · Sudoku-USA
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Lair of the Sphinx: a Riddle Book | 978-1-928807-00-1 | 2017 | |
| Quest for the Riddle Stone: a Riddle Book | 978-1-928807-09-4 | 2017 | Rick Smith |
| Riddle of the Unicorn | 978-1-928807-10-0 | 2017 | " |
| Riddle Rooms #1: Dungeon Dilemmas | 978-1-928807-01-8 | 1993 | " |
| Riddle Rooms #2: Wilderness Puzzles and Perils | 978-1-928807-02-5 | 1995 | " |
| Riddle Rooms #3: Past, Present and Future | 978-1-928807-05-6 | 2000 | " |
| Shadowman's Tricks & Traps | 978-1-928807-13-1 | 2008 | |
| Shadowman's Twisted Treasury: A Collection of Killer Puzzles | 978-1-928807-08-7 | 2003 | Rick Smith |
| Stars & Stripes Sudoku | 978-0-9815351-1-1 | 2008 | |
| Sudoku Islands | 978-0-9815351-2-8 | 2008 | |
| Tower of the Riddle Master: A Riddle Book | 978-1-928807-06-3 | 2017 | Rick Smith |
| Trividoku | 978-0-9815351-0-4 | 2010 | |