Corridor 7: Alien Invasion (PC) Gameplay
Developed by Capstone Software (the same company behind the infamously bad Operation Body Count), Corridor 7: Alien Invasion is actually a surprisingly decent Wolfenstein 3D-engine game with some unique features like a visor that can be switched to Infrared mode to reveal invisible traps, interactive terminals that can either grant you access cards or trigger alarms and send enemies to your location, wall-mounted health and ammo pickups, and even limited-use health chambers. Another unique aspect of the game is that instead of trying to find the exit, your goal is merely to eliminate every enemy and then return to the elevator and take it to the next floor.
Corridor 7 admittedly isn't nearly as good as Blake Stone or even Wolfenstein 3D (despite being more advanced than the latter), but I still think it's a 90s FPS that's well worth checking out and I've always loved its unsettling atmosphere and strange alien foes.
NOTE: The gameplay shown here is from the DOS version of the game. There is also a CD-ROM version that contains more features.
Corridor 7 can be purchased on Steam and GOG via the following links:
https://store.steampowered.com/app/1341890/Corridor_7_Alien_Invasion/
https://www.gog.com/en/game/corridor_7_alien_invasion
Timestamps:
00:00 Intro
00:13 Level 1
02:43 Level 2
08:37 Level 3