| 32369 | Jigsaw - An Interactive History (ZxZvm) | ZX-Spectrum 128 +3 | English |
| 10842 | Jinxter | ZX-Spectrum 128 +3 | English |
| 9867 | Jock and the Beanstalk | ZX-Spectrum 48K | English |
| 38503 | Jogo de Aventura | ZX-Spectrum 48K | Portuguese |
| 35471 | Johny v akci | ZX-Spectrum 48K | Czech |
| 6515 | Jolly Duplicator | ZX-Spectrum 48K | English |
| 6516 | Jolly Jack's Run Ashore | ZX-Spectrum 48K | English |
| 22796 | Jolly Poppa Down | ZX-Spectrum 48K | English |
| 32370 | Journey to Alpha Centauri in Real Time - An Interactive Waste of Time (ZxZvm) | ZX-Spectrum 128 +3 | English |
| 6517 | Journey to Death | ZX-Spectrum 48K | English |
| 17425 | Journey to the Centre of the Earth | ZX-Spectrum 48K | English |
| 21015 | Juanito 3 | ZX-Spectrum 48K | Spanish |
| 30181 | Jucha | Pentagon 128 | Russian |
| 18926 | Jueves 12 y Sabado 14 | ZX-Spectrum 48K/128K | Spanish |
| 24043 | Jungle | ZX-Spectrum 48K | English |
| 35396 | KSČM | ZX-Spectrum 48K | Czech |
| 6520 | Kamelreiten | ZX-Spectrum 48K | German |
| 9873 | Kartagngon 2 | ZX-Spectrum 48K | English |
| 35394 | Katanga | ZX-Spectrum 48K | Czech |
| 35527 | Kekyzárny 1 - Průzkum | ZX-Spectrum 48K | Slovak |