Humans vs. Zombies is a massive, campus-wide game that simulates a zombie outbreak. The game starts off with one original Zombie (the OZ), who can tag any participating Human player and turn them into a Zombie. Zombies are given an allotted amount of time to tag all the Humans, or else they starve and are out of the game.
HvZ kicks off with a "pregame", which simulates the rapid spread of the virus before anyone realizes what's going on. From the first day on, all players wear green armbands on their left arms. The Original Zombie moves among the Humans as a silent-but-deadly killer. He/she tags as many Humans as possible. Once tagged, a Human becomes a Zombie in 15 minutes. Be careful, these Zombies aren't slow and ambling. They're lean, mean, killing machines, and they will stop at nothing to feed on flesh.