Quake walkthrough (Episode 1: Dimension of the Doomed)

I decided to remember my youth and replay quake. In the past I played it on P166MMX at 20 fps. There was no music either. :)
Engine: darkplaces + mods.
Levels:
00:25 Slipgate Complex
03:54 Castle of the Damned
07:19 Necropolis
12:21 Grisly Grotto
17:30 Ziggurat Vertigo (secret level)
22:06 Gloom Keep
28:10 Door to Chthon
32:03 House of Chthon