| PC/MS-Windows pack. |  Abstract Grind Model 2100300 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstract Hell Model 961190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstract Initiative Model 522070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstract Winter Model 2245500 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstract World Model 1990160 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstract Model 946070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstractanks Model 1390970 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstractanoid Model 714640 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abstraction Model 1201090 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Absurd Chess Model 1694640 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Absurdika Model 2387660 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Absylon 7 Demo Model 1727050 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Absylon 7 Model 1727030 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abtos Covert Demo Model 1767970 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abtos Covert Model 1694230 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abunka Model 888420 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aby's Playground Model 2268440 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss - The Wraiths of Eden Model 284710 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Cave Model 348740 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Crawlers plus Model 794760 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Crew Model 769520 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Delvers Model 1456080 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss King Demo Model 1845070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss King Model 1641820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Manager Model 963490 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Odyssey Model 255070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss of Death Model 1354000 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss of Fire Model 2308220 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss of Neptune Model 1562020 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss of the Sacrifice Model 1442160 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Protection Demo Model 2132330 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Protection Model 1688520 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Raiders - Uncharted Model 348730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss The Forgotten Past Model 1369980 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss World - Apocalypse Model 2244780 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Model 1193080 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Model 1633770 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyss Model 2278000 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyssal Agent Alyss Model 1362300 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abyssal Fall Demo Model 694360 | 20?? | Steam Valve Corp. |
