| Game Name | System |
|---|
| Alien Syndrome (1987)(ACE Software)[a] | ZX Spectrum (TAP) |
| Alien Syndrome (1987)(Ace Software)[a2] | ZX Spectrum (TAP) |
| Alien Syndrome (1987)(Sega Entertainment Inc) | DOS |
| Alien Syndrome (1987)(Sega)[a2][one disk] | Atari ST |
| Alien Syndrome (1987)(Sega)[a][one disk] | Atari ST |
| Alien Syndrome (1987)(Sega)[cr Replicants][one disk] | Atari ST |
| Alien Syndrome (1987)(Sega)[one disk] | Atari ST |
| Alien Syndrome (1992)(Dempa) | X68K |
| Alien Syndrome (1992)(Dempa)[a2] | X68K |
| Alien Syndrome (1992)(Dempa)[a3] | X68K |
| Alien Syndrome (1992)(Dempa)[a] | X68K |
| Alien Syndrome (Europe) | PSP |
| Alien Syndrome (Japan) | Game Gear |
| Alien Syndrome (Japan) | SMS |
| Alien Syndrome (Japan) | NES |
| Alien Syndrome (Mega-Tech, SMS based) | MAME |
| Alien Syndrome (U) | C64 PP |
| Alien Syndrome (U) [alt] | C64 PP |
| Alien Syndrome (UK) (1987) | CPC |
| Alien Syndrome (USA) | PSP |
| Alien Syndrome (USA) (Unl) | NES |
| Alien Syndrome (USA, Europe) | Game Gear |
| Alien Syndrome (USA, Europe) | SMS |
| Alien Syndrome (set 1, Japan, old, System 16A, FD1089A 317-0033) | MAME |
| Alien Syndrome (set 2, System 16A, FD1089A 317-0033) | MAME |
| Alien Syndrome (set 3, System 16B, FD1089A 317-0033) | MAME |
| Alien Syndrome (set 4, System 16B, unprotected) | MAME |
| Alien Syndrome (set 5, System 16A, FD1089B 317-0037) | MAME |
| Alien Syndrome (set 6, Japan, new, System 16B, FD1089A 317-0033) | MAME |
| Alien Syndrome (set 7, System 16B, MC-8123B 317-00xx) | MAME |
| Alien Tank Attack (G) (1991) | CPC |
| Alien Tennis Chikyuu No Kiki (19xx)(Killer) | X68K |
| Alien Thing (1995)(999 Software)[cr Vectronix] | Atari ST |
| Alien Thing (1995)(999 Software)[cr Vectronix][a2] | Atari ST |
| Alien Thing (1995)(999 Software)[cr Vectronix][a] | Atari ST |
| Alien Thing - Director's Cut (1996)(Top Byte)[cr Atarilegend][One Disk] | Atari ST |
| Alien Thing - Director's Cut (1996)(Top Byte)[cr Elite] | Atari ST |
| Alien Thing - Expert Edition (1996)(Top Byte)[cr Vectronix][f Falcon][t +4] | Atari ST |
| Alien Trilogy (1996)(Probe Entertainment) | DOS |
| Alien Trilogy (E) | Saturn |
| Alien Trilogy (E) | PSX |
| Alien Trilogy (G) | PSX |
| Alien Trilogy (GER) | Saturn |
| Alien Trilogy (Japan) | PSX |
| Alien Trilogy (U) | Saturn |
| Alien Trilogy (USA) | PSX2PSP |
| Alien Trilogy [U] | PSX |
| Alien Typhoon (1981)(Starcraft) | Apple2 |
| Alien VS Predator (C) | NES |
| Alien Virus CD (1994)(Vic Tokai) | DOS |
| Alien World (1992)(HiTEC Software) | Atari ST |
| Alien World (1992)(HiTEC Software)[a] | Atari ST |
| Alien World (1992)(HiTEC Software)[cr Cynix] | Atari ST |
| Alien World (1992)(HiTEC Software)[cr Cynix][a2] | Atari ST |
| Alien World (1992)(HiTEC Software)[cr Cynix][a3] | Atari ST |
| Alien World (1992)(HiTEC Software)[cr Cynix][a] | Atari ST |
| Alien World (E) | C64 Tapes |
| Alien X (19xx)(-) | ZX Spectrum Z80 |
| Alien X (19xx)(-) | ZX Spectrum (TAP) |
| Alien X (19xx)(-)[a2] | ZX Spectrum Z80 |
| Alien X (19xx)(-)[a] | ZX Spectrum Z80 |
| Alien from Outta Space (19xx)(Incentive)[b] [UEF] | BBC Micro |
| Alien from Outta Space (19xx)(Incentive)[h TSTH][bootfile] [SSD] | BBC Micro |
| Alien vs Predator (USA) (Proto) | Lynx |
| Alien vs Predator (World) | Jaguar |
| Alien vs Predator - The Last of His Clan (Japan) | GB |
| Alien vs Predator - The Last of His Clan (USA) | GB |
| Alien vs. Predator (Asia 940520) | MAME |
| Alien vs. Predator (Asia 940520) | CPS2 |
| Alien vs. Predator (Euro 940520 Phoenix Edition) (Bootleg) | CPS2 |
| Alien vs. Predator (Euro 940520 Phoenix Edition) (bootleg) | MAME |
| Alien vs. Predator (Euro 940520) | MAME |
| Alien vs. Predator (Euro 940520) | CPS2 |
| Alien vs. Predator (Europe) | SNES |
| Alien vs. Predator (Hispanic 940520) | MAME |
| Alien vs. Predator (Hispanic 940520) | CPS2 |
| Alien vs. Predator (Japan 940520) | MAME |
| Alien vs. Predator (Japan 940520) | CPS2 |
| Alien vs. Predator (USA 940520) | MAME |
| Alien vs. Predator (USA 940520) | CPS2 |
| Alien vs. Predator (USA) | SNES |
| Alien3: The Gun (US) | MAME |
| Alien3: The Gun (World) | MAME |
| Alien: The Arcade Medal Edition | MAME |
| AlienFront Online (USA) | DC |
| AlienGarden | Atari 800 |
| Alien_Ambush_DANA | Atari 800 |
| Alien_Barrage | Atari 800 |
| Alien_Craft! | Atari 800 |
| Alien_Hell | Atari 800 |
| Alien_Swarm | Atari 800 |
| Alien_Trap | Atari 800 |
| Alienators - Evolution Continues (U)(Mode7) | GBA |
| Alienbusters (1991)(Blackfire!)[t][k-file] | Atari 800 |
| Aliencounter_Face_Flash | Atari 800 |
| Aliens | Atari 800 |
| Aliens & Firelord & Tempest & Trapdoor | CPC |
| Aliens (1985)(S. Green) | ZX Spectrum (TAP) |
| Aliens (1986)(Activision)(Disk 1 of 2) | Apple2 |
| Aliens (1986)(Activision)(Disk 2 of 2) | Apple2 |
