| PC/MS-Windows pack. |  A Week of Circus Terror Demo Model 503760 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  A Week of Circus Terror Model 498450 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Week Model 2153890 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Weekend in Puzzleburg Demo Model 2003440 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Weekend in Puzzleburg Model 1929760 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Western Drama Demo Model 1546410 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Western Drama Model 1494230 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Whisper in the Twilight Model 2422840 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wholesome Game About Farming Model 1892850 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wild Catgirl Appears! Model 429580 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Winding Path Model 1382800 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Winter's Daydream Model 925340 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wise Use of Time Demo Model 397790 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wise Use of Time Model 397780 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wizard's Lizard Model 280040 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wolf in Autumn Model 395270 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Wonder Model 683930 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A World Abandoned Model 1512810 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A World of Little Legends Demo Model 1933260 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A World of Little Legends Model 1476680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A World To Win Model 1587170 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A World With No Colour Model 459730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Writer And His Daughter Model 698520 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Year of Rain Model 319540 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A YEAR of SPRINGS Demo Model 1688930 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Year of Springs Model 1688580 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A Zone Model 1174440 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Escape VR Demo Model 538340 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Escape VR Model 538330 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Gents Model 460910 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Mazing Enigmas Model 1988820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Men 2 Model 294190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-men Model 264460 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Spec First Assault Demo Model 2007290 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Spec First Assault Model 1608330 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Star Theft Demo Model 1360920 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Star Theft Model 1354750 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Tech Cybernetic Demo Model 716820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Tech Cybernetic VR Model 578210 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | A-Train - All Aboard! Tourism Model 1685460 | 20?? | Steam Valve Corp. |
