| Costume Quest (2010) | 6,641,638 | 6,930 |
| Costume Quest 2 (2014) | 7,191,346 | 4,892 |
| Cosy Company Puzzle (2025) | 0 | 0 |
| Cotard (2025) | 0 | 0 |
| Cotton 2: Magical Night Dreams (1997) | 165,549 | 345 |
| COTTOn Boomerang - Saturn Tribute (2022) | 2,521 | 16 |
| Cotton Fantasy (2021) | 581,337 | 860 |
| Cotton Reboot (2021) | 373,877 | 571 |
| Cotton: Fantastic Night Dreams (1991) | 2,410,920 | 685 |
| Cottonville (2025) | 22 | 1 |
| Couch Combat (2022) | 549,254 | 241 |
| Couch Monsters (2021) | 206,108 | 38 |
| Couch Racers (2025) | 0 | 0 |
| The Council (2018) | 113,803,373 | 14,798 |
| The Council of Hanwell (2018) | 10,646,217 | 128 |
| Council of Mages: The Party Game (2024) | 79 | 3 |
| The Count (1979) | 796,478 | 124 |
| Count Duckula 2 (1992) | 53,328 | 49 |
| The Count Lucanor (2016) | 7,782,007 | 2,232 |
| Count Pumpcula (2023) | 10,605 | 14 |
| Countdown (1990) | 1,319,748 | 260 |
| Countdown Final Zone (2024) | 68 | 4 |
| Countdown Timer (2023) | 4,272,292 | 761 |
| Countdown to Doom (1982) | 66,722 | 17 |
| Countdown to Shutdown (1984) | 4,557 | 9 |
| Countdown Vampires (1999) | 3,341,670 | 1,282 |
| Counter Action (1996) | 102,003 | 59 |
| Counter Clash (2025) | 7,017 | 17 |
| Counter Fight (2016) | 32,999,428 | 640 |
| Counter Force (2007) | 313,813 | 55 |
| Counter Recon: The First Mission (2021) | 31,434 | 17 |
| Counter-Strike (1999) | 2,656,043,313 | 355,352 |
| Counter-Strike 2 (2023) | 60,753,154,240 | 3,864,849 |
| Counter-Strike Neo (2005) | 328,742 | 100 |
| Counter-Strike Nexon: Studio (2014) | 34,331,638 | 8,337 |
| Counter-Strike Nexon: Zombies (2014) | 6,828,858 | 1,179 |
| Counter-Strike Online (2008) | 317,433,739 | 27,071 |
| Counter-Strike Online 2 (2013) | 85,443,465 | 9,101 |
| Counter-Strike: Condition Zero (2004) | 57,150,721 | 23,898 |
| Counter-Strike: Malvinas (2013) | 71 | 1 |
| Counter-Strike: Source (2004) | 49,048,337,274 | 532,260 |
| Counter-Stroke: Grand Building (2022) | 0 | 0 |
| Counter: Side (2021) | 78,243,331 | 39,322 |
| CounterAttack: Uprising (2019) | 4,184 | 44 |
| Counterclocking (2023) | 4,052 | 48 |
| CounterSpy (2014) | 3,135,722 | 1,728 |
| Countess in Crimson (2022) | 74,523 | 8 |
| Countin' Stars (2024) | 647 | 3 |
| Countless Army (2024) | 213,440 | 23 |
| Country Dance (2011) | 1,361,056 | 400 |
| Country Dance 2 (2011) | 1,310,879 | 96 |
| Country Dance All Stars (2012) | 66,405 | 30 |
| Country Hopper (2025) | 0 | 0 |
| Country Justice: Revenge of the Rednecks (2005) | 10,051,783 | 46 |
| Country Life (2009) | 159,276 | 117 |
| Country Tales (2015) | 15,910 | 168 |
| Country Tales 2: New Frontiers (2024) | 6,952 | 37 |
| Countryball The Real Time Strategy Game (2025) | 251,568 | 3 |
| CountryBalls Heroes (2021) | 1,534,257 | 214 |
| Countryballs: Over The World (2018) | 1,862 | 7 |
| Countryside Life Simulator (2024) | 524,753 | 52 |
| The Courage to be Disliked (2024) | 28,114 | 25 |
| Courier Bay (2026) | 0 | 0 |
| Courier Chief Tycoon (2023) | 0 | 0 |
| Courier Crisis (1997) | 190,309 | 230 |
| Courier Life Simulator (2025) | 0 | 0 |
| Courier of the Crypts (2015) | 44,169 | 107 |
| Courier Tale (2024) | 70 | 4 |
| Court of Ashes (2019) | 422 | 3 |
| Court of Crowns (2023) | 3,688 | 9 |
| The Court Of Wanderers (2024) | 7,385 | 44 |
| Court, Connect, Capture (2023) | 1 | 1 |
| Courtyard Broomball (2018) | 175 | 1 |
| Coven (2022) | 4,460,650 | 369 |
| The Coven of Calahree (2022) | 508 | 1 |
