1. How do you wipe out the Phobos Lab? Nightmare demons are pain in the ass.
Fighting them in narrow corridors is simply a suicide. Shotguns doesn't work well as their armor is 3.
Luring the nightmare demons in the upper corridors to the central nukage pool is the best way but this is kinda luck-based.
In left-side nukage pool, I think 2 env suits are insufficient to lure entire of them to kill them in the pool of acid. Any advice?
On Nightmare? Is "Don't go in that level" an option?
Luring them in to the acid is basically the only way I ever deal with them unless I'm berserking my way through with a chainsaw. If you can't lure them without taking damage, it's because of one of two reasons:
1. Your movespeed should be extremely good if you want to play Nightmare and especially if you want to beat this level. Be a scout or get hellrunner but both would be great.
2. You don't need to beat this special level nearly as much as you think you do.
After that, I have no experience with the left side of the map on Nightmare - I always avoid phobos lab and military base.
2. How do you pass the Anomaly? I think the best strategy is:
1) prepare 2~3 phase devices and pray for god
2) prepare rocket launcher, and crush the right door before ambush opens. If ambush opens, immediately use the rocket-jump to right to escape
But 1) is luck-based and 2) needs rocket launcher, that is, you must clear the Arena (this itself is hard and Chained Court goes crazy).
Is there any other nice strategies?
The only guaranteed strategy I've ever come up with for this is as such:
0) Be a scout
1) Go in to Chained Court (not the hard version, of course)
2) Clear out one side as well as you can without dying or using any heals (otherwise you'll die trying to run past several chaingunners - even while berserk)
3) Go back in to the middle, grab all 5 berserks
4) Run from the chained court to anomaly, don't stop for anything other than health packs and enemies in your way.
5) You will still be berserk for about 50 more turns. Grab the large health packs, put on the red armor, run through the ambush and take little damage.