| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Ogre | Richard Hunt | ? | English | |
| Oklib's Revenge | Syntax Adventure Magazine | 1992 | English | |
| On the River Styx | H. W. Williams | ? | English | |
| One Smurfy Day | Paul Allen Panks |
? | English | |
| Oo-topos | Penguin Software |
1981 | English | Solution |
| Ooze: Creepy Nites | Dragonware | 1989 | English | Solution |
| Original Adventure, The | Norell Data Systems |
1982 | English | Solution, Map |