| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Oklib's Revenge | Syntax Adventure Magazine | 1992 | English | |
| One That Got Away, The | Leon Lin | 1995 | English | Solution |
| Oo-topos | Penguin Software |
1981 | English | Solution |
| Ooze - Als die Geister Murbe Wurden | Ariolasoft, Dragonware | 1988 | German | Solution |
| Ooze: Creepy Nites | Dragonware | 1989 | English | Solution |
| Operation Hongkong | Golden Games | 1986 | German | Solution |