| PC/MS-Windows pack. |  CastleAbra Model 366570 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Castles Model 384010 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Caverns of the Snow Witch Model 324730 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Celestian Tales - Old North Model 315860 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Chicken Invaders 3 Model 377460 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Chicken Invaders 5 Model 353090 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Chip's Challenge 1 Model 346850 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cinderella Escape! R12 Model 408000 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cineveo - Virtual Reality Cinema Model 364380 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cities - Skylines Model 255710 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cities XXL Model 313010 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clannad Model 324160 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Combat - Panthers in the Fog Model 368220 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Close Your Eyes Model 377330 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clown House (Palyaço Evi) Model 387970 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | CMYW Model 396590 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Co-Op - Decrypted Model 315130 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colonial Defence Force Ghostship Model 263640 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Color Assembler Model 370570 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Community College Hero - Trial By Fire Model 423120 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes - Europe At War Model 342370 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crookz - The Big Heist Model 310490 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cross of the Dutchman Model 384000 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crossfire - Dungeons Model 369370 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Devil May Cry 4 - Special Edition Model 329050 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Doom & Destiny Model 318130 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dragon Fantasy - The Volumes of Westeria Model 327980 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dragon Quest Heroes - Slime Edition Model 410850 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dragon Saga Model 381990 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dragonball Xenoverse Model 323470 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dungeon Lords Steam Edition Model 271760 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Dynasty Warriors 8 Empires Model 322520 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Elements - Epic Heroes Model 410490 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Elements - Soul of Fire Model 340650 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Escape Model 365050 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Everything is Black and White Model 365430 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Evolve Stage 2 Model 273350 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Fake Colours Model 334300 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Farm Frenzy - Heave Ho Model 395930 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Farm Frenzy - Hurricane Season Model 361930 | 2015 | Steam Valve Corp. |
