Infection

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Infection is a multiplayer gametype in Halo 3. It is the official Zombie mode after its popularity as a custom game in Halo 2.

Objectives
The object of the game is for the Humans and Sangheili to stay alive as long as possible while the zombies try kill to every living player. The number of players starting out as Zombies ("Alpha Zombies") can be changed in the options and are selected at random from the start. When a zombie kills a living player, he/she is "infected" and thus becomes a zombie. When there is just one living Human or Sangheili left, he/she is declared "Last Man Standing".

One way Infection is commonly played is that players will make custom maps with Forge where the living have a strong point equipped with weapons, grenades, equipment and vehicles to defend against the zombies.

An option and popular way to play of infection on Snowbound is where the humans try to defend the rock that they are at while fending of zombies. It works best if the ratio of the zombies to humans is 1:3

Halloween Playlists
On October 31, 2007, a specialized Halloween matchmaking playlist was available, which played this game mode with precisely 13 players (it being an "unlucky" number). On April 10th, 2008, the playlist came back for Double EXPWeekend

Trivia

 * There is an Infection medal called MMM... Brains! this refers to the classic zombie horror movie, in which zombies are feeding on human brains and other parts of their body.
 * Infection is the only gametype that is not available through Matchmaking.
 * The Infection gametype is the most popular gametype in custom games as it can only be played in custom games.
 * The most forged maps for Infection are generally Sandtrap and Foundry.
 * A common way to play is with Zombies have full speed and 50% gravity.

Related Articles
The most forged maps for Infection are generally Sandtrap, Foundry, Last Resort, and The Pit
 * Infection Settings