| PC/MS-Windows pack. |  Alien Vision Model 1757900 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Wall Model 1582810 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Worm Model 1790700 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Worms Invasion Model 805710 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien X Model 1502600 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Zombie Megadeath Model 110610 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Model 2203780 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Model 524270 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien's Armageddon Model 1350210 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Alien-911 Demo Model 1337110 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alienafterlife Model 1014570 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alienate Demo Model 1319190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alienate! Model 1954910 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alienautics Model 602270 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens & Asteroids Model 661030 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens - Fireteam Elite Model 1549970 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens After Ava Demo Model 2165240 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens After Ava Model 1995780 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens and Umbrellas Model 1081340 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Are Rude! Model 819160 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Attack VR Model 932190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Colonial Marines Model 81401 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Don't Exist Model 989340 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Go Home Run Model 514340 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens in Paradise Model 1510250 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens in the Yard Model 648190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Love Beefs Model 1273060 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Tower Defense Model 2400750 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Versus Predator Classic 2000 Model 3730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens vs Predator Demo Model 34200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliens Vs. Ghosts Model 1609730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alienstein Model 1959330 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aliensurvival Model 809220 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alienzix Model 685230 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alight - Lunar Survival Demo Model 2143920 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alight - Lunar Survival Model 2084210 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alight in the Dark Demo Model 2320310 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alight in the Dark Model 2019020 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alight Model 1050270 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alignment Model 2284900 | 20?? | Steam Valve Corp. |
