| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Ocean Hunt | Molimerx |
1983 | English | Solution |
| Old Classic Adventure, The | Fritz Langhart | 2023 | English | |
| Oldorf's Revenge | Highlands Computer Services |
1980 | English | |
| Oliver's Twist | Asgard Software | 1988 | English | |
| On Safari | Micro Adventurer, Sunshine Books | 1984 | English | Solution, Map |
| One for the Road | ANALOG Computing |
1985 | English | Solution, Map |
| Opposite Edge of Slumber | Artem Flo | 2020 | English | Solution, Map |
| Ork! House of Fortune | Brett Walker | 1989 | English | Map, Hints |
| Over Here! | Lionel Ange |
2020 | English | Solution, Map, Hints |