| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| 1-2-3... | Chris Mudd | 2000 | English | Solution |
| 12:54 to Asgard, The | J. Robinson Wheeler | 2010 | English | Solution |
| 1958: Dancing With Fear | VĂctor Ojuel | 2017 | English | |
| 198BREW | H. M. Faust |
2024 | English | |
| 222 Contra el Cangrejo | Jarel |
2008 | Spanish | |
| 2604 | Admiral Jota | 2001 | English | Solution, Map |
| 404- Life not Found | Evan Derby | 2011 | English | |
| 5 Minutes to Burn Something! | Alex Butterfield | 2015 | English | Solution |
| 5. Kammer, Die | Tobias Heintzen | 2004 | German | |
| 50 Shades of Jilting | Rowan Lipkovits | 2014 | English | Solution |
| 500 Rooms, The | manonamora | 2024 | English | Map |
| 69,105 Keys | David Welbourn | 2009 | English | Solution |
| 69105 More Keys | Andrew Schultz | 2019 | English | |
| 77 Verbs | Brian Rushton |
2020 | English | |
| 8 Shoes on the Shelves | Marc Duane | 2017 | English | |
| 9:05 | Adam Cadre |
2000 | English | Solution |
| 98769765 | Adam Biltcliffe | 2003 | English | Solution, Map |
| 9Lives | InformStorm | 2013 | English |