| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Odisea | Juana Pueblo Soft | 1990 | Spanish | |
| Ojo del Dragon, El | Wazertown Works | 1990 | Spanish | Map |
| Olimpo en Guerra | Eduardo José Villalobos Galindo | 1989 | Spanish | Solution |
| On Reflection | Cheese Freak Software | 2007 | English | Solution |
| On the Run | Alfo Software | 1989 | English | |
| Once Upon a Lily Pad | Global Games |
1989 | English | Solution |
| Operation Thunderbowel | Sacred Scroll Software | 1988 | English | Solution, Map, Hints |
| Orb Quest | Guild Adventure Software, The |
1991 | English | Solution, Map |
| Out of the Limelight | WoW Software |
1992 | English | Solution, Map |