Omggg best map I've played yet, we definitely need more objective based maps like this.
I'll outline it for you guys who have trouble :
Keypad at the painting to the left of the big doors at the first. Down the elevator, follow the path (won't give any secrets out), get to the red queen room, only one person should go into the laser room, get to the end where the door is, try to hack it then just crouch and stay by that door until the lasers are over. From there all I will say is watch the movie it's EXACTLY like it except the sewer part you aren't above the zombies and it's pitch black(love it).
there are a few secret type things to it and you really really really have to have at least 5 people on your team 6 is recommended...because you will not make it past the ending since one or two of you will die throughout it, probably all of you will the first playthrough and to get through the ending part you really have to have at least 3~4 people unless you are really good then maybe 1~2 would do it if they have enough ammo.
We played at least 9 times and never finished it except one run we managed to get 2 people to the end but the patriarch bugged out and got stuck/glitched under the train (might be a bug you want to look into, maybe putting him near the door would do it?) but yeh there is really no ending you just grenade yourself and restart which really sucks but I suppose that would take some server-side modding to happen or maybe a button that kills the entire wave (set it to only 1 wave) and disable the boss or something? Or maybe set a button to open the last door and that kills the wave but spawns a boss near the players? Just some thoughts other than that it is really amazing and I pray you do some more maps like this as it was fun to try and figure out and still is fun to try and finish it
Oh yah btw we were doing it on suicidal, that seems to be the funnest way to attempt it...on normal there is too few specimens to enjoy the whole ammo conservation part of it.