| PC/MS-Windows pack. |  99 Spirits - Weeping Demon's Bell Model 262230 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Train 8 Model 338080 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Train 9 Ver. 4.0 - Japan Rail Simulator Model 278550 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | A.I. Invasion Model 386540 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | ABD - A Beautiful Day Model 384920 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | ACE - Arena Cyber Evolution Model 285580 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | ADventure Lib Model 374950 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Adventures of Bertram Fiddle - Episode 1 - A Dreadly Business Model 354680 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Age of Fear - The Undead King Model 351480 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Age of Fear 2 - The Chaos Lord GOLD Model 341150 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Agon - The Lost Sword of Toledo Model 410130 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Agon - The Mysterious Codex Model 410120 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Agricultural Simulator 2012 - Deluxe Edition Model 273790 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | AION Model 261430 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Aion Model 373680 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Airport Madness - Time Machine Model 402210 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Airport Madness - World Edition Model 369290 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Akiba's Trip - Undead & Undressed Model 333980 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Albino Lullaby Model 355860 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Alone in the Dark - Illumination Model 275060 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Amnesia - Memories Model 359390 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Angels That Kill - The Final Cut Model 383240 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Anki Model 395380 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Anno 2205 Model 375910 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Anomaly Zone Model 316390 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Apothecarium - The Renaissance of Evil - Premium Edition Model 373860 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Ar-K - The Great Escape Model 368890 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Arcana Heart 3 Love Max!!!!! Model 370460 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Arm Planetary Prospectors Episode 1 Model 344890 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Assassin's Creed Chronicles - China Model 354380 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Assassin's Creed Rogue Model 311560 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Assassin's Creed Syndicate Model 368500 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Atlas Model 338090 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Audiosurf 2 Model 235800 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Audition Online Model 349720 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Aveyond 3-3 - The Lost Orb Model 321880 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Axes and Arrows Model 406400 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Baseball Mogul 2015 Model 388270 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Batman - Arkham Knight Model 208650 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Battle Chess - Game of Kings Model 200150 | 2015 | Steam Valve Corp. |
