Zombie Apocalypse mod for Unreal Tournament 3

Essence Statement
In an effort to extend the average human life-cycle, a group of scientists unwittingly create a transmittable disease that reacts violently to the chemicals your body releases when you die. This reaction jump-starts the body for continued life. however, without any thoughts of their own, these walking dead rely on only their natural instincts and their extreme hunger. They feel no pain, have no known rational thoughts and they will eat anything not infected with the disease.
You, are one of the lucky ones who managed to hide in a bomb shelter. Now, after a few weeks of living off rations, you must try to survive the aftermath and escape the city.

As you search for a means of escape, you will uncover all the documented events leading up to and after the Zombie Apocalypse.

Game Overview
Zombie Apocalypse is a First Person Shooter, mixed with a classic action adventures game such as Sam & Max hit the road or the Leisure suite larry series. Theres is also a splash of a role playing game in the leveling and character creation. 

The player is a survivor of an initial zombie outbreak, and must complete several quests in order to escape the quarantined city full of undead. The goal of the game is not only to escape the city, but to solve the mystery of why there are zombies, and even stop them.

The player must use all of their skills in order to travel from building to building, room to room, and search in all the cupboards, desks and filing cabinets in order to stock up on items and ammo. The player has a limited amount of carrying capacity and must take what they think is needed, if the player is alone, they have a larger carrying capacity, but playing with friends, they have a smaller carrying capacity and must communicate what is needed and who can carry what.

If the player encounters any one of the several types of undead creatures in the game, they must either fight the undead, or flee from it. This is because the zombie will be screaming and pretty soon the populace of an entire city will be after the players with an intent to eat them.

The game is over after they manage to avoid the undead, collect the items they need, search for more items they need, build vehicles, and ultimately escape the city. If all the players are killed by zombies and turned undead, the game is also over.

Key Features

Quest based gameplay
-The player must search for his items and ammo. In this endeavor, they will come across plot items and they will have to figure out how to use them in order to complete the game. For example they may discover a fuse, there would be several places to use a fuse but the player must decide the best place to use it

Stealth focused
-there are an infinite amount of zombies in the sewers of the city below the player, so the player must avoid the undead so they dont wake the entire undead populace, if a zombie sees a player it will call out to other zombies while it attacks the player, they player must flee or destroy the zombie before another zombie arrives and they call for more zombies too

Many player multiplayer
-this game can feature an almost infinite amount of players, but is designed around 3-6
-for every player in the game, all the other players carry less and there are more items spawned, and more enemies

Character customization 
-Similar to D&D Character creation, the player receives a number of stats at the beginning of the game and can lower one skill to increase another
-this will give more dynamic creation of classes, such as a brawler, or a mechanic, or a sprinter

Leveling
-The player may not notice it, but behind the scenes, the player increases their stats over time by doing tasks, such as searching through cupboards will increase their searching skill, and thus lower the time it takes to search an area

Vehicles
-Players may come across certain vehicles and with the right tools, they will be able to repair and use them.
-The ground vehicles would offer protection from the undead, as well as help the player move across the city
-A repaired helicopter could help the player escape the city

Free roaming environment
-The city is quarantined around its borders, but there's a lot of city to explore

Item pickups
-all items can be used as weapons, you find a rock and use it to hit

Physics damage
-Players can throw any weapon on hand

Dynamic gameplay
-the levels can be created in a modular form, which will allow the players to create their own levels using an in game level editor
-all items will shuffle through the searchable areas and as such, will enforce the player to search everywhere and no play-through will be the same
-the zombie spawner will create unique zombies, such as slow zombie with a low attack or vice versa, so every encounter is different
-there is also different stains of zombie suited for different tasks

Several different endings
-with several quest trees, such as call for help, or fix a helicopter, if the player completes that string of objectives, they will escape the city in one of several ways
-if the player fails a quest, that string of objectives is cut off, and the player must find another way to escape

Detachable limbs
-The zombies in the game all have limbs that can be broken and severed off
-This lowers the zombies speed, forces the to crawl or lowers their ability to attack the player
-zombies will also spawn with broken limbs or without limbs 

Sub quests
-quests like, find the key code to the bunker, will be optional, but opens up a lot of options for the player

Discover the story
-the player is dropped into this environment, and does not know why the zombies are there, where they came from, or how they came to be. As they progress through the game they come across diaries, new papers, police reports, science texts, recordings. All the events leading up to the zombie apocalypse can be discovered and may require several playthroughs