| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| O Zone, The | Compass Software |
1986 | English | Solution, Hints |
| Occhio del Diavolo, L' | Arcadia, Load 'n' Run |
1986 | Italian | Solution, Map |
| Odessy | Brendan Clarke | 1986 | English | Solution |
| Odinshrine | Elise C. Boucher (Zosia the Pious) |
1986 | English | Solution |
| Odyssey | 64'er, Markt & Technik | 1986 | German | Solution, Map, Hints, Fixed game |
| Odyssey, The | Duckworth Home Computing |
1986 | English | Solution |
| Omniverse | Computerware | 1986 | English | Map |
| Operation Hawaii | Golden Games | 1986 | German | Solution, Map |
| Operation Hongkong | Golden Games | 1986 | German | Solution |
| Operation Kristos | Computer and Video Games | 1986 | English | Solution |
| Operazione Ladro | Arcadia, Load 'n' Run |
1986 | Italian | Solution, Map |
| Orb, The | A&B Computing | 1986 | English | Solution |
| Orbit of Doom | Central Solutions |
1986 | English | Solution, Map |
| Oriental | Arcadia, Load 'n' Run |
1986 | Italian | Solution, Map |
| Overlord | Elise C. Boucher (Zosia the Pious) |
1986 | English | Solution |
| Oxbridge | Tynesoft | 1986 | English | Solution, Hints |