| PC/MS-Windows pack. |  City Game Studio Model 726840 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | City Legends - The Curse of the Crimson Shadow Collector's Edition Model 1744200 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | City Maker Model 1540910 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | City of Gangsters Model 1386780 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clarence Goes To The F&#%Ing Store Model 1718040 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clean Art Model 1756920 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cleaning Robot Match - Scatter Battlers | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. |  Cleaning Robot Match - Scatter Battlers TrialEdition Model 1597830 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clip Maker Model 1536420 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clockwork Pussy Model 1576500 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Combat - Modern Tactics Model 1367330 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | CLT Model 1502410 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | CoalheroDemo Model 1666100 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Code Zero Model 1175490 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Code Zero Model 1585390 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Code.Breaker() Model 1756550 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cognition Method - Initiation Model 1554860 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coin Pusher World Model 1697460 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colibri XR Immersive Art Gallery Model 1629060 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Collection of SaGa - Final Fantasy Legend Model 1642620 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Collector Thief Model 1737010 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | College Bound Model 1630080 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | College Kings - The Complete Season Model 1463120 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cologne 3D Model 1722420 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Color By Number - Medieval Portrait Model 1697470 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Color By Number - Monster Heroes Model 1820180 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colorblend Fx - Desaturation Prologue Model 1663930 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Book For Kids Model 1507410 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Game 4 Model 1554790 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Pixel - Fantasy Characters Model 1755170 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colorize Inspect Model 1589970 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Comixxx Duality Model 1805220 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Command Line Pilot Model 1481630 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes - Back To Basics Model 1527290 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Concordia - Digital Edition Model 1450330 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest - Medieval Kingdoms Model 1439220 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest of Elysium 3 Model 211900 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest of Elysium 4 Model 403950 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest of Elysium 5 Model 1606340 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest of Empires Model 1518750 | 2021 | Steam Valve Corp. |
