Faceless God (mc_rj2_deviltower) is definitely my favourite so far in this pack: the kill count of 133 is not especially huge, but the map feels like an extended and testing combat despite this, due to well-judged horde attacks. The difficulty of these is made up for by very generous over-provisioning of ammo.
It takes place in a sprawling, irrational cathedral. None of it makes a ton of sense, but on this occasion I’m OK with that. My one big disappointment is that, after opening up the room behind the altar and finding the three teleporters, only one of them led anywhere interesting.
I missed three of the kills and only found two of the seven secrets. Crucially, I never got the rocket launcher. I know where it is — behind a metal panel at the bottom of some dead-end stairs — but I never figured out how to open the panel.