| Sinclair ZX Spectrum cass. |  California Games Model 550441 | 1990 | Kixx 013442 |
| Sinclair ZX Spectrum cass. |  Carlisle Powerbox | 1990 | Greenup, Ashley |
| Sinclair ZX Spectrum cass. | Carlos Sainz | 1990 | Musical 1, S.A. Spain |
| Sinclair ZX Spectrum cass. | Carlos Sainz - Campeonato del Mundo de Rallies Model CS-018-SPE | 1990 | Zigurat Soft. Spain |
| Sinclair ZX Spectrum cass. | Cashcade | 1990 | Fastback |
| Sinclair ZX Spectrum cass. | Castle Master | 1990 | Incentive Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Castle Master + Castle Master II - The Crypt Model Z39 | 1990 | Incentive Soft., Ltd. |
| Sinclair ZX Spectrum cass. |  Castle Master Model SE 601 | 1990 | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Cauldron I & II Model HT058 | 1990 | Hi-Tec Soft. |
| Sinclair ZX Spectrum cass. | Cavemania Model AT 363 | 1990 | Atlantis Soft. |
| Sinclair ZX Spectrum cass. | Cecco's Collection | 1990 | Hewson Consultants, Ltd. England 012635 |
| Sinclair ZX Spectrum cass. | Centipod | 1990 | Challenge Soft. |
| Sinclair ZX Spectrum cass. | Chase H.Q. II - Special Criminal Investigation | 1990 | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Chase H.Q. II - Special Criminal Investigation Model 015502 | 1990 | Ocean Soft., Ltd. 13156 |
| Sinclair ZX Spectrum cass. | Chip's Challenge P | 1990 | US Gold, Ltd. Birmingham, England 13442 |
| Sinclair ZX Spectrum cass. | Choy-Lee-Fut Kung-Fu Warrior Model SPC 23006 | 1990 | Positive Spain |
| Sinclair ZX Spectrum cass. | Ci-U-Than Trilogy-I: Cozumel Model SPE 900002 | 1990 | Adventuras AD Spain |
| Sinclair ZX Spectrum cass. | Classic Arcadia 2 | 1990 | Alternative Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Classic Games 2 | 1990 | System 4 de Espana, S.A. Spain |
| Sinclair ZX Spectrum cass. | Classic Trainer II | 1990 | GTI Soft. |
| Sinclair ZX Spectrum cass. | Coin-Op Hits | 1990 | US Gold, Ltd. Birmingham, England 13442 |
| Sinclair ZX Spectrum cass. | Collectors Edition 2: Impossaball Model 004897 | 1990 | Players Soft. |
| Sinclair ZX Spectrum cass. | Conman the Barbaric | 1990 | Northern Underground, The |
| Sinclair ZX Spectrum cass. | Corrupt | 1990 | GLL Soft. Spain |
| Sinclair ZX Spectrum cass. | Cosmic Sheriff Model SPE 890041 | 1990 | Dinamic Soft. Madrid, Spain |
| Sinclair ZX Spectrum cass. | Crack Down | 1990 | US Gold, Ltd. Birmingham, England 13442 |
| Sinclair ZX Spectrum cass. | Crash issue 72: Presents 08 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 73: Presents 09 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 74: Presents 10 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 75: Presents 11 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 76: Presents 12 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 77: Presents 13 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 78: Presents 14 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 79: Presents 15 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 80: Presents 16 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 81: Presents 17 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 82: Presents 18 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Crash issue 83: Presents 19 | 1990 | Crash, Ltd. |
| Sinclair ZX Spectrum cass. | Cricket Captain Model HT 001 | 1990 | Hi-Tec Soft. |
| Sinclair ZX Spectrum cass. | Cuban Mission | 1990 | Bolsoftware Communications Spain |
