| PC/MS-Windows pack. |  Alien Defense Unit Demo Model 1347930 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Alien Defense Unit Model 1326080 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Defense Model 1868840 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Defense Model 981480 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Destroyer Model 1697420 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Duel Elements Model 1450620 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Earth Model 1148390 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Egg - Ascent Model 1303680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Escape Model 1116290 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Extraction Demo Model 1876190 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Extraction Model 1768730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Flex Model 1653250 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Food Frenzy Model 765290 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Frontier Model 2330810 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Function Demo Model 1384850 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Function Model 1349640 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Gladiator Model 2061270 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hallway 2 Model 656450 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hallway Model 98900 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Harvest Leader Model 1284360 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hominid Invasion Demo Model 1383130 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hominid Invasion Model 843200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hostage Model 562430 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hunt 3D Model 897840 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Hunt Model 1731490 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Infection Model 1122460 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Insanity Model 598350 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Invaders From The Planet Plorth Model 764630 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Invasion - Rpg Idle Space Model 2265200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Invasion 3D Part 2 Model 1193680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Invasion 3D Model 818640 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ALIEN INVASION Demo Model 2156320 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Invasion Tower Defense Model 547880 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Invasion Model 1087040 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Jelly - Food For Thought! Model 984990 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Kingdom Model 1104960 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien League Model 1024540 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Life Lab Model 680240 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Life Simulator Model 1478310 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Marauder Model 1516750 | 20?? | Steam Valve Corp. |
