the title says it all, difficulty was hey not too rough and the time was 11:52 you can see the speedrun on oalofi1409 on youtube

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Introductions

Doom (Unity Ports)

Take a look at this guide for tips and tricks for Episode 1: Knee Deep in the Dead. It will help you learn the strats in the episode such as the zombie strat in map 6 and the blue room SR50 jump in map 4. 

Happy Dooming! :D

https://youtu.be/VU_7IEsChDc