| Cosmonet (2018) | 1,235 | 5 |
| Cosmophony (2015) | 33,948 | 105 |
| Cosmopoly (2022) | 1 | 1 |
| Cosmos Circuit (1984) | 4,615 | 12 |
| Cosmos Conquer (2022) | 153 | 2 |
| Cosmos Cop (1991) | 2,419 | 15 |
| Cosmos Invictus (2018) | 3,201 | 8 |
| Cosmos X2 (2010) | 21,897 | 5 |
| Cosmoteer (2017) | 16,450,097 | 4,204 |
| Cosmoteer: Starship Architect & Commander (2022) | 3,021,471 | 696 |
| Cosmotronik (2021) | 8,727 | 7 |
| Cosplay Simulator (2022) | 22,263 | 12 |
| Cossacks 3 (2016) | 63,355,070 | 15,501 |
| Cossacks II: Napoleonic Wars (2005) | 2,775,763 | 1,447 |
| Cossacks: European Wars (2000) | 29,206,446 | 1,911 |
| Cossanox (2019) | 124 | 4 |
| The Cost of Recovery (2021) | 2,809 | 8 |
| Costa Verde Transport Department (2023) | 17,795 | 43 |
| Costume Quest (2010) | 5,898,974 | 6,115 |
| Costume Quest 2 (2014) | 6,849,984 | 4,514 |
| Cotton 2: Magical Night Dreams (1997) | 220,773 | 296 |
| Cotton Fantasy (2021) | 478,437 | 635 |
| Cotton Reboot (2021) | 358,364 | 517 |
| Cotton: Fantastic Night Dreams (1991) | 639,958 | 579 |
| Couch Combat (2022) | 327,988 | 31 |
| Couch Monsters (2021) | 206,327 | 38 |
| The Council (2018) | 178,677,630 | 14,130 |
| The Council of Hanwell (2018) | 10,645,711 | 131 |
| Council of Mages: The Party Game (2024) | 0 | 0 |
| The Count (1979) | 800,677 | 818 |
| Count Duckula 2 (1992) | 54,810 | 46 |
| The Count Lucanor (2016) | 7,697,692 | 2,167 |
| Count Pumpcula (2023) | 10,715 | 10 |
| Countdown (1990) | 976,490 | 115 |
| Countdown Timer (2023) | 2,302,640 | 563 |
| Countdown to Doom (1982) | 23,587 | 16 |
| Countdown to Shutdown (1984) | 2,690 | 8 |
| Countdown Vampires (1999) | 3,356,527 | 1,155 |
| Counter Action (1996) | 118,256 | 56 |
| Counter Fight (2016) | 31,493,886 | 652 |
| Counter Force (2007) | 111,232 | 42 |
| Counter Recon: The First Mission (2021) | 31,417 | 16 |
| Counter-Strike (1999) | 2,950,526,171 | 317,973 |
| Counter-Strike 2 (2023) | 53,019,757,673 | 3,059,883 |
| Counter-Strike Neo (2005) | 642,958 | 81 |
| Counter-Strike Nexon: Studio (2014) | 31,646,097 | 8,091 |
| Counter-Strike Nexon: Zombies (2014) | 3,139,624 | 828 |
| Counter-Strike Online (2008) | 292,422,862 | 25,208 |
| Counter-Strike Online 2 (2013) | 73,166,550 | 10,001 |
| Counter-Strike: Condition Zero (2004) | 42,070,787 | 18,418 |
| Counter-Strike: Malvinas (2013) | 1,316 | 2 |
| Counter-Strike: Source (2004) | 818,399,426 | 90,011 |
| Counter-Stroke: Grand Building (2022) | 1 | 1 |
| Counter: Side (2021) | 74,366,445 | 39,525 |
| Counterclocking (2023) | 1,642 | 24 |
| CounterSpy (2014) | 3,442,721 | 1,608 |
| Countess in Crimson (2022) | 83,416 | 9 |
| Country Dance (2011) | 965,711 | 496 |
| Country Dance 2 (2011) | 274,529 | 93 |
| Country Dance All Stars (2012) | 57,157 | 18 |
| Country Justice: Revenge of the Rednecks (2005) | 10,186,913 | 47 |
| Country Life (2009) | 182,559 | 141 |
| CountryBalls Heroes (2021) | 1,536,058 | 224 |
| Countryballs: Over The World (2018) | 744 | 6 |
| The Courage to be Disliked (2024) | 0 | 0 |
| Courier Chief Tycoon (2023) | 0 | 0 |
| Courier Crisis (1997) | 190,217 | 218 |
| Courier of the Crypts (2015) | 37,711 | 102 |
| Court of Ashes (2019) | 49 | 2 |
| Court of Crowns (2023) | 1,989 | 8 |
| The Court Of Wanderers (2024) | 0 | 0 |
| Coven (2022) | 4,271,474 | 376 |
| The Coven of Calahree (2022) | 26 | 1 |
| Covenant of Solitude (2013) | 71,052 | 9 |
| Covenant: Project Zero (2023) | 15 | 3 |
