| 13061 | O.B.R.: Rapid Reaction Unit | ZX-Spectrum 48K/128K | Russian |
| 23395 | Oblivion | ZX-Spectrum 48K | Russian |
| 24974 | Omega Protector | ZX-Spectrum 48K | Russian |
| 21141 | On Susan | ZX-Spectrum 48K | Russian |
| 34268 | On-Line 01-26 | - | Russian |
| 34269 | On-Line 27-52 | - | Russian |
| 34270 | On-Line 53-79 | - | Russian |
| 34271 | On-Line 80-85 | - | Russian |
| 17226 | Oneiroid | ZX-Spectrum 128K | Russian |
| 12978 | Open IT! | ZX-Spectrum 128K | Russian |
| 17197 | Open Puzzle | ZX-Spectrum 128K | Russian |
| 12981 | Operation Red Refrigerator | ZX-Spectrum 128K | Russian |
| 41888 | Optron #01 | ZX-Spectrum 128K | Russian |
| 41889 | Optron #02 | ZX-Spectrum 128K | Russian |
| 41890 | Optron #03 | ZX-Spectrum 128K | Russian |
| 41891 | Optron #04 | ZX-Spectrum 128K | Russian |
| 41892 | Optron #05 | ZX-Spectrum 128K | Russian |
| 41893 | Optron #06 | ZX-Spectrum 128K | Russian |
| 41894 | Optron #07 | ZX-Spectrum 128K | Russian |
| 41895 | Optron #08 | ZX-Spectrum 128K | Russian |