| Name | Author | Released | Rating | DLs |
|---|---|---|---|---|
| CHIPS Mario | NovaYoshi ◪ | 2018-01-15 | 141 | |
| Chrono Wars MZX Demo | Chronos30 | 100 | ||
| City Limits | Pancake ◪ | 2006-05-23 | 115 | |
| Civil War 2040 | someone13 ◪ | 2000-03-30 | 90 | |
| Closure | inmate2993 ◪ | 2001-04-04 | 152 | |
| Code White Demo | Qzarko | 73 | ||
| Codename: Snip'a | RoSS ◪ | 2000-10-23 | 73 | |
| Collapse Demo | emegas ◪ | 1998-02-09 | 83 | |
| Collect the Gems Demo | ascii ◪ | 72 | ||
| Color Cluster (ver. 1.1b) | Vacek ◪ | 2023-07-21 | No reviews. | 81 |
| Columnz | paulguy ◪ | 2006-09-29 | 76 | |
| Comfat | Skylark ◪ | 2003-06-30 | 72 | |
| Commander Keen: Heroes Lost | ThDPro ◪ | 2012-12-29 | 832 | |
| Completion | KKairos ◪ | 2001-00-00 | 74 | |
| Conduit (ver. 2.4) | James | 1996-09-12 | 70 | |
| Confectioner's Recipe, A | ThDPro ◪ | 2013-09-30 | 219 | |
| Contra | Robert Scharlau | 72 | ||
| Cooking Game | zzo38 ◪ | 2003-06-12 | 152 | |
| Cop Chase | Patrick Santos | 77 | ||
| Corn Collection | cornsalt ◪ | No reviews. | 84 | |
| Cornbomb | cornsalt ◪ | 78 | ||
| CR2-0 | Giel ◪ | 2009-11-02 | 85 | |
| CR2-6 The Invasion | Giel ◪ | 2009-08-29 | 73 | |
| Craziness | nessaja_cat18 ◪ | 73 | ||
| Craziness 2 | nessaja_cat18 ◪ | 70 | ||
| Crisis in Stuffyou City (ver. Almost 10th Anniversary Edition) | Kuddy / ShloobeR / RoSS / Trev-MUN | 2012-06-16 | 116 | |
| Crook | Milkbomber | 1998-08-13 | 70 | |
| Crop Hunter Part I | Nedemai ◪ | 2004-12-20 | 65 | |
| Crosswords (ver. 1.0c) | Vacek ◪ | 2022-09-20 | No reviews. | 54 |
| Crustaceans | Jason H. Steele, John F. O'Meara | 1998-04-29 | No reviews. | 46 |
| Cry of Light Demo | KKairos ◪ | 2002-07-25 | No reviews. | 80 |
| Crystal Cities | ZZFreak | 1996-07-14 | 105 | |
| Crystal Cities 2 Demo | ZZFreak | 1998-07-22 | 90 | |
| Custard's Revenge | NovaYoshi ◪ | 2017-02-25 | 57 | |
| Custer's Revenge MZX | NovaYoshi ◪ | 2011-00-00 | 205 | |
| Cyborg Hunter Demo (ver. 1.2) | Scott Barnes | 1997-04-05 | 76 |