| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| 10 Cave Adventure | Einar Saukas | 2016 | English | Solution |
| 1893: A World's Fair Mystery | Peter Nepstad | 2003 | English | |
| 198? | Peter Scott | 2020 | English | |
| 2010 - the Second Odyssey | Paterak Software | 1985 | German | |
| 2112 - a Field Trip | Mutilation Software Independent | 2001 | English | Solution |
| 25 | ? | 1998 | English | |
| 3 investigadores y el misterio de la falsa herencia, Los | Commodore plus | 2023 | Spanish | Solution |
| 4 Mile Island Adventure | Owls Nest Software | 1983 | English | Solution |
| 4K Adventure | Patchwork Algorithms | 1996 | English | Solution, Map |
| 50 Shades of Jilting | Rowan Lipkovits | 2014 | English | Solution |
| 500 Rooms, The | manonamora | 2024 | English | Map |
| 6 Keys of Tangrin, The | Microtanic, Tansoft |
1981 | English |