| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Ocean Dancer | King Software | 1984 | English | Solution, Map |
| Once and Future | Cascade Mountain Publishing | 1998 | English | Solution |
| One Smurfy Day | Paul Allen Panks |
? | English | |
| Oth. | Gunther Schmidl | 2002 | English | Map, Solution |