Saw this video on how they made the original Doom

I think its awesome that they just faked the whole 3D thing. I never really thought about it like this before.

The instant I played Wolfestein I knew that they were using clever algorithms and data structuring to output a 3D image as the gameplay had limitations. I never played Doom 3D but I bet I would've noticed it too but I agree with the narrator that it is a much better trick.

But, the whole "Doom is not really 3D" is just clickbait at it's cringiest. The developers used clever algorithms that weren't as memmory intensive compared to more complex 3D in later games such as Ocarina of Time. Ocarina of Time has a clever way of handling dungeon rooms most notably the ice cavern.