| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2017 | 978-1-928807-00-1 | Matt Mayfield | Lair of the Sphinx: a Riddle Book |
| 1993 | 978-1-928807-01-8 | Rick Smith · Matt Mayfield | Riddle Rooms #1: Dungeon Dilemmas |
| 1995 | 978-1-928807-02-5 | Matt Mayfield · Rick Smith | Riddle Rooms #2: Wilderness Puzzles and Perils |
| 1996 | 978-1-928807-03-2 | Robin Marks · Darryl See | Thieves Island |
| 2000 | 978-1-928807-05-6 | Matt Mayfield · Rick Smith | Riddle Rooms #3: Past, Present and Future |
| 2017 | 978-1-928807-06-3 | '' | Tower of the Riddle Master: A Riddle Book |
| 2003 | 978-1-928807-08-7 | '' | Shadowman's Twisted Treasury: A Collection of Killer Puzzles |
| 2017 | 978-1-928807-09-4 | '' | Quest for the Riddle Stone: a Riddle Book |
| '' | 978-1-928807-10-0 | '' | Riddle of the Unicorn |
| 2008 | 978-1-928807-13-1 | Matt Mayfield | Shadowman's Tricks & Traps |