Final Doom - TNT: Evilution Last Call w/o glitches
So, yea, it was the GZDoom engine port I was using that was causing the glitches in that last level. The older ZDoom (GZDoom is based on it and 'upgraded') worked fine. Better than fine, I actually like ZDoom better than the updated one.
Anyway, here we take a look at Last Call again, and see that the stairs were indeed supposed to go all the way up. Both times. They didn't. Once you do that, the level is a lot easier to beat. So it's not the map, not the game that was the problem. And that is good news.
Edit: After reporting the glitch to the GZDoom team, it was quickly fixed in the next version, currently out. The final map works flawlessly now. It was just very unfortunate timing that I had a version that didn't work, if you download GZDoom yourself now for this game this level will work as intended. -- Watch live at https://www.twitch.tv/the_nametag
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