| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Undercover | William Quinn | 1992 | English | Solution, Map, Hints |
| Underground Escape | Jon Ripley |
1996 | English | Solution |
| Unknown Treasure, The | David Gibbon | 1989 | English | |
| Use Your Loaf | Guild Adventure Software, The |
? | English | Solution, Hints |