Infection

Infection is a confirmed multiplayer gametype in Halo 3, discovered by beta source code hackers. It has been hypothesized that there is a Zombie (possibly Flood-infected) team fighting a Human team as in the Halo 2 game variant "Dawn of the Dead" The object for the humans is to survive the Zombie infection--a variation on the multiplayer game Zombies, but enforced by rules instead of the honor system.

The Zombie gametype pits a "zombie" or "infection" team against the "human" team. The goal of the human team is to survive to a time limit; the goal of the infection teams is to infect the humans, who respawn as members of the Zombie team.