1.A few seconds after the game starts, a random player will turn into a zombie.
2.Every other person who is hit by the zombie will become a zombie.
3.Continues until only zombies are left, or zombies are all killed by humans.
Humans often gather in places that are hard to reach, or build human towers to get on top of large boxes.
Zombies are granted extra health and greater speed.
We were playing Biohazard, and everybody was in the pipe on cs_assault when suddenly one guy turned into a zombie and infected everyone else.