| ID | Title | Machine | Language |
|---|---|---|---|
| 39642 | Clef | ZX81 16K | English |
| 31872 | Clever Clogs Whizz Quiz for age 7+ | ZX81 16K | - |
| 29498 | Climber | ZX81 16K | English |
| 41823 | Climber | ZX81 16K | - |
| 43332 | Climber | ZX81 16K | German |
| 35661 | Clive | ZX81 16K | English |
| 32009 | Clock | ZX81 16K | Portuguese |
| 41562 | Clock | ZX81 16K | English |
| 31566 | Club Record Controller | ZX81 16K | - |
| 31567 | Club Records | ZX81 16K | - |
| 39330 | Cobra | ZX81 16K | Finnish |
| 40537 | Coconuts | ZX81 16K | English |
| 40005 | Code Cracker | ZX81 16K | English |
| 34491 | Code IV | ZX81 16K | English |
| 40044 | Code Loader | ZX81 16K | English |
| 41069 | Code Storage | ZX81 16K | English |
| 41429 | Code Transfer | ZX81 16K | English |
| 28764 | Code-Breaker | ZX81 16K | English |
| 41558 | Coding Graphics | ZX81 16K | English |
| 28767 | Coin Game | ZX81 16K | German |