| 937 | Chip's Challenge | ZX-Spectrum 48K/128K | English |
| 19929 | Chromacode | ZX-Spectrum 48K | English |
| 26298 | Cinque Doni Sotto L'Albero | ZX-Spectrum 48K | Italian |
| 25725 | Cipher Breaker | ZX-Spectrum 48K | English |
| 24054 | Clavijas | ZX-Spectrum 48K | Spanish |
| 12775 | Clickmania | ZX-Spectrum 128K | English |
| 27689 | Clive | ZX-Spectrum 48K | French |
| 12776 | Clocks Head Cracker | ZX-Spectrum 128K | English |
| 42185 | Clone Zoo ZX | ZX-Spectrum 48K | English |
| 26184 | Code | ZX-Spectrum 16K | English |
| 44755 | Code Break | ZX-Spectrum 16K | English |
| 45072 | Code Breaker | ZX-Spectrum 16K | English |
| 9611 | Code Breaker | ZX-Spectrum 16K | English |
| 25009 | Code Breaker | ZX-Spectrum 48K | English |
| 26645 | Code Setter - Code Breaker | ZX-Spectrum 48K | English |
| 14497 | CodeBreker | ZX-Spectrum 48K | Dutch |
| 16982 | Codebreaker | ZX-Spectrum 16K | English |
| 15925 | Codebreaker | ZX-Spectrum 16K | English |
| 24108 | Codebuster | ZX-Spectrum 48K | English |
| 26139 | Codemaker | ZX-Spectrum 16K | English |