| PC/MS-Windows pack. |  Close Combat - Cross of Iron Model 1367320 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Combat - The Longest Day Model 1272130 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Combat - Wacht Am Rhein Model 1272110 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coffee Break Model 1207500 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coldside Model 1098270 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colorful3D II Model 1251760 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Book Model 1431240 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Game 2 Model 1216200 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Game 3 Model 1275640 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colorize Model 1348220 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | ColorsInvaders Model 1274340 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colour Flux Model 1323080 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Command & Conquer - Remastered Collection Model 1213210 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Commander '85 Prologue Model 1356460 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Commander '85 Model 1086990 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Commandos 2 - HD Remaster Model 1100410 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes - Europe in Ruins Model 664260 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Computer Physics Simulators 2020 Model 1265410 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conflict Area Model 1343550 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conqueror's Blade Model 835570 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cooking Companions - Appetizer Edition Model 1419370 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Core Awaken - Jilelen and Littlesnow Model 1289960 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Core Defense - Prelude Model 1259230 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coronavirus Battlegrounds - Coronavirus News Model 1310210 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | CoronaWhomp! Model 1300940 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Corrupted Hospital - Summoner Part1 Model 1440870 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cosmic Flow - A Relaxing VR Experience Model 1267950 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cosmo Dreamer Model 1424630 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Couch Installation Service Model 1412610 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Countershots 1.0 Model 1158900 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cover Me In Leaves Model 1431420 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Covid-19 (Corona Virus) Model 1283760 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Covid-19 Isolation Model 1325370 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cowboy Yakuza Model 1198380 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Croppy Boy Model 1369400 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crown Trick Model 1000010 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crusader Kings III Model 1158310 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crysis 3 Model 1282690 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crystal Caves HD Model 1330890 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crystal Story - The Hero and the Evil Witch Model 1300190 | 2020 | Steam Valve Corp. |
