| 32386 | Odieu's Quest for the Magic Flingshot (ZxZvm) | ZX-Spectrum 128 +3 | English |
| 32387 | Of Forms Unknown - An Interactive Excursion (ZxZvm) | ZX-Spectrum 128 +3 | English |
| 14593 | Oh Shit! | ZX-Spectrum 48K | English |
| 6758 | Olimpo en Guerra | ZX-Spectrum 48K | Spanish |
| 27921 | Olisa | ZX-Spectrum 48K | - |
| 18544 | On Reflection | ZX-Spectrum 128K | English |
| 35412 | On the Road | ZX-Spectrum 48K | Czech |
| 20396 | On the Run | ZX-Spectrum 48K | English |
| 10881 | Once Upon a Lily Pad | ZX-Spectrum 48K | English |
| 10882 | One Dark Night | ZX-Spectrum 48K | English |
| 45191 | One Knight Stand | ZX-Spectrum 128K | English |
| 6759 | One of our Wombats is Missing | ZX-Spectrum 48K | English |
| 6761 | Operation Colossus | ZX-Spectrum 48K | English |
| 39373 | Operation Eagle | ZX-Spectrum 48K | English |
| 13150 | Operation Roman Gaul | ZX-Spectrum 48K | English |
| 18983 | Operation SOS | ZX-Spectrum 48K | English |
| 6763 | Operation Turtle | ZX-Spectrum 48K | English |
| 21069 | Oragon | ZX-Spectrum 48K | Russian |
| 6767 | Orb | ZX-Spectrum 48K | English |
| 6769 | Orb Quest | ZX-Spectrum 128K | English |