| Title |
Publisher |
Year |
Language |
Documents |
| OCI |
Tearsoft |
1988 |
English |
|
| Odieus' Quest for the Magic Flingshot |
CTH Enterprises , Grim Reaper, The  |
1988 |
English |
Solution |
| Oldorf's Revenge |
Highlands Computer Services , Synergistic Software |
1980 |
English |
|
| One for the Road |
ANALOG Computing  |
1985 |
English |
Solution, Map |
| Onyx |
Utopia Software [1]  |
1990 |
Czech |
|
| Opera House |
Bignose Software |
1984 |
English |
Solution, Hints |
| Operation: Novatari |
? |
? |
English |
|
| Operation: Sabotage |
Guild Adventure Software, The , SoftSide Publications  |
1982 |
English |
Solution, Map, Fixed game |
| Original Adventure, The |
Norell Data Systems , Software Toolworks |
1982 |
English |
Solution, Map |
| Overheard! |
Grim Reaper, The  |
1992 |
English |
|