| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| O-Level Caper, The | Phoenix Software [1] |
1983 | English | |
| Old West | COMPUTE! Publications | 1984 | English | Solution |
| On Safari | Micro Adventurer, Sunshine Books | 1984 | English | Solution, Map |
| On the Way to the Interview | Commodore Computing International |
1983 | English | Solution |
| Ontsnapping uit Colditz | ? | ? | Dutch | Solution, Map |
| Orb | Impact Software | 1982 | English | Map, Hints |
| Orb | Impact Software | 1982 | Dutch |