| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2008 | 978-0-9810306-0-9 | Eric Moreau | The Squared Circle: Wrestling RPG |
| 2009 | 978-0-9810306-2-3 | Eric Moreau | The Squared Circle: Lucha Libre |
| '' | 978-0-9810306-3-0 | '' | The Squared Circle: Puroresu |
| '' | 978-0-9810306-5-4 | '' | The Squared Circle: The 80's |