I believe I found a early beta of Corridor 7

[spoone]

https://wolf3d.net/articles/corridor-7-beta-invasion/

It seems to play more like wolfenstein 3d this time around. A lot of the weapons have been changed since the final version and the enemies are different too. Very cool find even though it's not a good video game.

[Scaryfun]

Nice find! Thanks for sharing with us.

[gtamodder85]

I remember it, not bad back then but looking at it now, and when we got Doom shortly after, not so much.

Still this is very cool and interesting, thanks for sharing!