| ID | Title | Machine | Language |
|---|---|---|---|
| 40900 | Judgement | ZX81 16K | English |
| 44399 | Juego de las Parejas | ZX81 16K | Spanish |
| 33422 | Julia Set Generator | ZX81 16K | - |
| 32027 | Julia Sets | ZX81 16K | English |
| 39673 | Jumble | ZX81 16K | English |
| 40934 | Jumble Word | ZX81 16K | English |
| 29004 | Jump | ZX81 16K | German |
| 41438 | Jump, Push, Pop and Run | ZX81 16K | English |
| 41619 | Jumper | ZX81 16K | English |
| 31691 | Jungle Maths | ZX81 16K | - |
| 41161 | Jungle of Death | ZX81 16K | English |
| 31692 | Junior Education 2 | ZX81 16K | - |
| 41191 | Junior Jackpot | ZX81 16K | English |
| 39646 | Junior Maths | ZX81 16K | English |
| 31694 | Junior Maths 1 | ZX81 16K | - |
| 31695 | Junior Maths 2 | ZX81 16K | - |
| 29006 | KALABRIA | ZX81 16K | English |
| 39639 | Kaleidoscope | ZX81 16K | English |
| 33423 | Kaleidoscope | ZX81 16K | - |
| 43305 | Kalender | ZX81 16K | German |