| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Obscene Quest of Dr. Aardvarkbarf, The | Gary Roggin | 1997 | English | Solution |
| Orb Quest | Guild Adventure Software, The |
1991 | English | Solution, Map |
| Once Upon a Lily Pad | Global Games |
1989 | English | Solution |
| Odieus' Quest for the Magic Flingshot | CTH Enterprises |
1988 | English | Solution |
| OMNIQuest | Chris Barden, Chris Ethridge | 1988 | English | Map, Hints |
| Orion Quest, The | Argus Press Software, Mind Games | 1984 | English | Solution, Map |