| ID | Title | Machine | Language |
|---|---|---|---|
| 43556 | K-MAN | ZX81 1K | English |
| 43561 | KILOPEDE | ZX81 1K | English |
| 29021 | KRAAKROU | ZX81 1K | English |
| 35735 | Kaleidescope | ZX81 1K | English |
| 39346 | Kaleidoscope | ZX81 1K | English |
| 29009 | Keyboard Sound | ZX81 1K | English |
| 35980 | Kim | ZX81 1K | English |
| 35727 | Klingons | ZX81 1K | English |
| 29550 | Knife, Paper, Stone | ZX81 1K | English |
| 41229 | Knots | ZX81 1K | English |
| 29552 | Kong | ZX81 1K | English |
| 38601 | L.A.S.E.R. | ZX81 1K | Portuguese |
| 43553 | LUNAPARK81 | ZX81 1K | English |
| 29553 | Lander | ZX81 1K | English |
| 29554 | Language | ZX81 1K | English |
| 36371 | Laser | ZX81 1K | Portuguese |
| 41232 | Laser Defence | ZX81 1K | English |
| 31944 | Lights-Out 1K | ZX81 1K | Spanish |
| 35184 | Lingo | ZX81 1K | English |
| 35981 | Liquid Capacity | ZX81 1K | English |