| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Uncle Zebulon's Will | Magnus Olsson | 1995 | English | Solution |
| Under the Cognomen of Edgar Allan Poe | Jim Nelson | 2024 | English | |
| Undertale: Epilogue | ? | 2015 | English | |
| Undertow | Stephen Granade | 1995 | English | Solution |
| Undo | Neil deMause | 1995 | English | Solution |
| Unease | Brendan J. O'Brien | 2002 | English | |
| Unnkulia One-Half: The Salesman Triumphant | Adventions | 1993 | English | Solution |
| Unnkulia X: Escape of the Sacrificed | Valentine Kopteltsev | 2000 | English | Solution |
| Unnkulia Zero: The Search for Amanda | Adventions | 1993 | English | Solution |
| Unnkulian Underworld: The Unknown Unventure | Adventions | 1990 | English | Solution |
| Unnkulian Unventure II: The Secret of Acme | Adventions | 1991 | English | Solution |
| Untitled | Mark J. Musante | 1998 | English | |
| Urban Cleanup | Philip Dearmore | 1996 | English | Solution |