There have been multiple strategies on the warehouse, but this strategy is thought to be the most effective in terms of getting the highest time. At the start of the game, part of the map is inaccessible until the round starts and the emergency alarmed doors are opened. Go through the doors and up the stairs to the far corner of the map. The general style of play favors dodging rocks and tongues as well as delegating the task of horde control to a single player while the other 3 players focus the tank. Despite how difficult the ammo runs are the rest is fairly easy. 

- 1 player faces the downstairs at the top of the stair way (A).

- 1 player faces both up and downstairs sitting in the furthest corner (B).

- 1 player faces the upstairs hall near the shelving/pillar (C).

- 1 player faces the upstairs hall near the guard rail on the right (D).

- Pistols are primarily used until a tank gets close enough.

- Tanks from the front should be handled by 3 players while the right player deals with horde from the stairs.

- Tanks from the right should be handled by 3 players while the left player deals with horde and avoids specials.

- Our first ammo run is at 9mins and we stay near the ammo in a corner until 12:00 for an easy trip with nearly no damage taken. Use shotguns from 9:00 until you return upstairs after 12:00.

- Once upstairs pistols are spammed and players do their best to avoid rocks and smoker pulls.

- Checking on allies ammo helps the team prepare when an ammo run is needed. We like to have at least 40 shotgun shells before we run for ammo. 

- If one is using too much ammo have that player switch positions with the player with the most ammo to maximize efficiency. 

- These ammo runs require great speed and cover; so, you may have to kill 1 or 2 tanks just to get there let alone getting back. Stay together and communicate. Pipe bombs make all the difference, but try not to throw too many.

- Make sure you pick up any supplies on the way for ammo. Forgetting could make or break a new time.

- It's well known that the map is somewhat buggy and that the difficulty level varies depending on how many tanks you get. We shoot to kill all the stuck specials. 

- If the tank takes too long to get to you it might lead to a frightening double tank. (Which we had about 3.)

- Dodging rocks/tongues upstairs is key to saving your health in the long run but can be difficult when horde overwhelms, request help if needed.

- Its very important to save an ally immediately when shooting for high times, no health wasted.
pills are best saved for emergency use on ammo runs, as it's very easy for all but the guy covering the stairs to avoid taking any damage in the holdout spot.

- If you go for the set at the far opposite corner past the ammo throw an extra pipe and pick a new one up next to them. 

- The best route to grab the set on the cabling wheel is to go around the back of the train car after grabbing ammo and looping around it. 

- Throwing a pipe before you run into the starting room on the way to get ammo a few seconds before you run in will clear horde and allow you to get through that room without trouble.

- Although you want to conserve ammo as much as possible, don't be afraid to use your shotgun on the run back (at least till you've got upstairs).

- To conserve ammo with tanks pistol them till they get close/you need to reload your pistols (you can stretch ammo runs to once every 20 minutes even with a tank per min using this method).

by GuyGuy