| PC/MS-Windows pack. |  Actua Soccer 2 Model 2152690 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Soccer 3 Model 285030 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Tennis Model 2152730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actual Multiple Monitors Model 241680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actual Sunlight Model 288040 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actual Volleyball Model 972650 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Agency Tycoon Model 1298820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Exitum Model 444990 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Infernum Model 1390070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Infinitum Model 1234430 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Movere - Chapter 2 Model 840640 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Ad Wars Demo Model 1792540 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Wars Model 1554050 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ADA - Além d' Aventura Model 1398200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ada and Cal Model 1719960 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ADACA Demo Model 1821300 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ADACA Model 1765780 | 2022 | Steam Valve Corp. |
| PC/MS-Windows pack. | Adagio Model 1061430 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam - Lost Memories Model 1121590 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam - Robot World Model 1146210 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam and Eve - The Game - Chapter 1 Demo Model 465560 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam and Eve - The Game - Chapter 1 Model 443530 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam Newman - Fuzzies Model 654280 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam The Storyteller Demo Model 1576730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam The Storyteller Model 1564130 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam Waste Demo Model 786550 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam Waste Model 673310 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam Wolfe Model 483420 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam's Memories Model 1869680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam's Venture Chronicles Model 362410 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam's Venture Episode 1 - The Search For The Lost Garden Model 108100 | 2012 | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam's Venture Episode 2 - Solomon's Secret Model 210390 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam's Venture Episode 3 - Revelations Model 214310 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam's Venture Origins Model 400360 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adamanta View Model 1821910 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Adams Ascending Demo Model 1439940 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adams Ascending Model 1110210 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adamstown Demo Model 1999200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adamstown Model 1945860 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adanath Demo Model 2158460 | 20?? | Steam Valve Corp. |
