This is a zombie apocalypse "simulation" that i did a few weeks ago using GZDoom, and my early work in "Doom of the Dead" as a base, it's kinda like this early doom of the dead video (http://www.youtube.com/watch?v=VIBygBBEvyQ) but done better, and less boring.
From a city populated by 1080 civilians and guarded by 144 cops, It took a single zombie and 26 minutes and 7 seven seconds to infest the whole city with zombies.
The rules of the zombie apocalypse were the following:
*A single hit from a zombie it's enough to infect a person(this excludes the police since the never get infected)
*After some time, the infected person "dies" and may reanimate into a zombie or has a small chance of turning into a meat corpse ready to be eaten by the zombies
*If a zombie it's "killed" it will raise again stronger and more agressive, it will also throw his own organs to attack
*Shooting at the bodies of the recently deceased, is an effective way to prevent it from rising as a zombie
Please excuse my poor english and grammar, as you can tell by the ingame texts, english is not my native tongue