| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Oceana | Philip Boswell | 1993 | English | |
| Odieus' Quest for the Magic Flingshot | CTH Enterprises |
1988 | English | Solution |
| Oklib's Revenge | Syntax Adventure Magazine | 1992 | English | |
| Oprør På Nyx | Sepia Adventures | 1988 | Danish | Solution |
| Orientation to Van Pelt Library | Richard Young | ? | English |