DOOM - Crap WADs: PIE.wad
It's a good concept, but it's really badly executed. And it looks shit too.
What we have here is an attempt at a puzzle. A completely shit puzzle that takes little effort to solve once you notice the 'main room' is completely blocked off and your only weapon is about as effective as pissing against a tsunami.
At least it's a good example of a software renderer bug/limitation though; so long as you can see a floor/ceiling flat, it won't obscure any objects regardless of how far deep they've gone into the surface itself. In other words, you can see a sprite in its entirety until the lower/upper texture of a moving sector crosses the middle of the screen.
Other Videos By DeimosComaBlack
Other Statistics
Doom Statistics For DeimosComaBlack
Currently, DeimosComaBlack has 282,022 views for Doom across 219 videos. His channel currently has around 20 hours worth of content for Doom, or 19.80% of the total watchable video on DeimosComaBlack's YouTube channel.