| 28747 | The Castles of Carmain | ZX81 16K | English |
| 29496 | The Champ | ZX81 16K | English |
| 31562 | The Checkbook Manager | ZX81 16K | - |
| 32091 | The City of Alzan | ZX81 16K | English |
| 43119 | The City of Alzan | ZX81 16K | English |
| 39858 | The Code Machine | ZX81 16K | English |
| 31573 | The Complete Sinclair ZX81 Basic Course | ZX81 16K | - |
| 31576 | The Computer Coach | ZX81 16K | - |
| 31585 | The Coupon Manager | ZX81 16K | - |
| 41334 | The Crossing | ZX81 16K | English |
| 32096 | The Crystal Maze | ZX81 16K | - |
| 31588 | The Cube Game | ZX81 16K | - |
| 43532 | The Cursed Woods | ZX81 16K | English |
| 28797 | The Damsel and the Beast | ZX81 16K | English |
| 40725 | The Dictator | ZX81 16K | English |
| 35670 | The Easter Bunny has to water the garden with a bad cough by firstly figuring out the controls | ZX81 16K | English |
| 31601 | The Electronic Checkbook | ZX81 16K | - |
| 29378 | The Fast One | ZX81 16K | English |
| 40520 | The Fireman | ZX81 16K | English |
| 31615 | The First | ZX81 16K | - |