| 8515 | Nyitrai Matrix | ZX-Spectrum 128K | English |
| 45012 | Nyitraisoko | ZX-Spectrum 128K | Hungarian |
| 27890 | OUTplay | ZX-Spectrum 128K | English |
| 22347 | Octunes | ZX-Spectrum 128K | English |
| 3489 | Odd Job Eddie | ZX-Spectrum 128K | English |
| 7623 | Odysseus Party Minishow | ZX-Spectrum 128K | English |
| 7625 | Off Topic | ZX-Spectrum 128K | English |
| 7626 | Oi! | ZX-Spectrum 128K | English |
| 27239 | Olaf the Viking | ZX-Spectrum 128K | English |
| 42711 | Old Skool Coding Old School Style | ZX-Spectrum 128K | Multi-language: English, Russian |
| 14405 | Ommadawn | ZX-Spectrum 128K | English |
| 18544 | On Reflection | ZX-Spectrum 128K | English |
| 7627 | One Day Demo | ZX-Spectrum 128K | English |
| 45191 | One Knight Stand | ZX-Spectrum 128K | English |
| 3525 | One Man and His Droid II | ZX-Spectrum 128K | English |
| 7628 | One Too Many 2: The Total Piss-Up | ZX-Spectrum 128K | English |
| 7629 | One Too Many 3 | ZX-Spectrum 128K | English |
| 17226 | Oneiroid | ZX-Spectrum 128K | Russian |
| 30377 | Ooze | ZX-Spectrum 128K | English |
| 12978 | Open IT! | ZX-Spectrum 128K | Russian |