| 10017 | Operation Gunshot | ZX-Spectrum 48K/128K | English |
| 3528 | Operation Hanoi | ZX-Spectrum 48K/128K | English |
| 3530 | Operation Hormuz | ZX-Spectrum 48K/128K | English |
| 3532 | Operation Thunderbolt | ZX-Spectrum 48K/128K | English |
| 3534 | Operation Wolf | ZX-Spectrum 48K/128K | English |
| 42674 | Orbol Voon | ZX-Spectrum 48K/128K | Multi-language: English, Spanish |
| 8524 | Organ Master | ZX-Spectrum 48K/128K | English |
| 3544 | Oriental Games | ZX-Spectrum 48K/128K | English |
| 43608 | Osotos | ZX-Spectrum 48K/128K | English |
| 12693 | Our Life 3 | ZX-Spectrum 48K/128K | Russian |
| 3563 | Out Run | ZX-Spectrum 48K/128K | English |
| 3567 | Out Run Europa | ZX-Spectrum 48K/128K | English |
| 36468 | Out Run Europa: Re-Imagined | ZX-Spectrum 48K/128K | English |
| 3559 | Out of This World | ZX-Spectrum 48K/128K | English |
| 3561 | Outlaw | ZX-Spectrum 48K/128K | English |
| 3569 | Overlander | ZX-Spectrum 48K/128K | English |
| 7636 | Overscan Demo | ZX-Spectrum 48K/128K | English |
| 3575 | P-47 Thunderbolt | ZX-Spectrum 48K/128K | English |
| 14607 | POKEs | ZX-Spectrum 48K/128K | Romanian |
| 16840 | POKEs 2 | ZX-Spectrum 48K/128K | Romanian |