| PC/MS-Windows pack. |  CityBattle - Virtual Earth Model 611020 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil Warfare - Another Bullet In The War Model 734590 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clad in Iron - Sakhalin 1904 Model 963680 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clark - Hoova VR Model 626700 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Classic Card Games 3D Model 941920 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Climb Model 876900 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Combat - Last Stand Arnhem Model 936530 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Your Eyes - Anniversary Remake Model 706710 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clue/Cluedo - The Classic Mystery Game Model 794800 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cognizer Model 711690 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cold War Model 834490 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colina - Legacy Model 371650 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Color By Numbers - Animals Model 954410 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Color By Numbers - Christmas Model 954400 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Book Model 984590 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Coloring Pixels Model 897330 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colour Box Model 810690 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Community College Hero - Knowledge Is Power Model 847290 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Comrades and Barons - Solitaire of Bloody 1919 Model 787710 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conan Exiles Model 440900 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Construction Simulator 2 - Pocket Edition Model 787740 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Containment Initiative PC Model 792680 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Core Awaken - The Yuka Model 878150 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Corpse Party - Book of Shadows Model 778390 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cosmic Snake 8473/3671 Model 809360 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Croc's World - Construction Kit Model 831910 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cross of Auria Model 764180 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cross-Channel - Steam Edition Model 812560 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | CSI VR - Crime Scene Investigation Model 893650 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cube 332 Model 939150 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cyberdimension Neptunia - 4 Goddesses Online Model 632350 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Das Geisterschiff Model 975230 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dead Cells Model 588650 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dead Forest Model 737510 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dead In Vinland Model 573120 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dead Reckoning - The Crescent Case Collector's Edition Model 815560 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Demon King Domination - Deluxe Edition Model 921530 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Devil May Cry - HD Collection Model 631510 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Don't Bite Me Bro! + Model 786450 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Don't Look Back Model 811630 | 2018 | Steam Valve Corp. |
