| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| 1893: A World's Fair Mystery | Peter Nepstad | 2003 | English | |
| 2604 | Admiral Jota | 2001 | English | Solution, Map |
| 69,105 Keys | David Welbourn | 2009 | English | Solution |
| 69105 More Keys | Andrew Schultz | 2019 | English | |
| 98769765 | Adam Biltcliffe | 2003 | English | Solution, Map |