IT MUST BE PLAYED ON MY INFECTION GAME VARIANT CALLED Unleashed! The Dungeon is the name of the map yet it is also inside the map.
What i mean is that the zombies spawn inside a dungeon and don't get released out of the The Dungeon until either 10 seconds or 30 seconds in the game.
There is four cages in the Dungeon the bottom-left opens at 10 seconds, bottom-right opens at 30 seconds, and the top two cages opening at one minute.
The humans spawn in a base with no weapons and start off with pistols. They must make it to the other base as quick as possible to get to get a weapon. Their are limited weapons so if you are playing with a big party you're going to fight for one. Weapons in the base are- 3x Covenant Carbines, 2x smgs, 1x needler, 2x shotguns, and 2x battle rifles.
It takes about 10 seconds to make it over to the other side and grab a weapon. Knowing that the zombies get released at 10 seconds. There are three shield doors in the hallway and one in the weapon room. Also there is a crate that is blocking the other side of the map that is not pushable or moveable until 45 seconds in the game. All you need to do to get the crate out is melee it once. Once you are on the other side there is a rocket nearwith only two bullets the elevator to get the back area or on top of the boxes whatever you want to say, a sniper rifle with 12 bullets, and a flamethrower that is in the tunnel.

Below are the map and the game variant.
The Dungeon Map
Unleashed Game variant

A video of gameplay
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The link to video

Human spawn point

The Dungeon (Zombie spawn place)

Zombies Unleashed

The hallway

The Weapon room

Zombies invade the weapon room

The crate that block off the 2nd part of the map

Crate opened up after 45 seconds

2nd side of the map 1

2nd side of the map 2

Back wall or area on the second side of the map

The tunnel

The elevator

Below are the map and the game variant.
The Dungeon Map
Unleashed Game variant