Treyarch has officially announced the latest additions to the new and improved Zombies mode, marking the third time it has been included in the Call of Duty franchise.

The new additions include new modes, including both competitive and co-operative play, weapons, characters, and a much easier way for players to experience the Zombies’ story this time around.

More info and a trailer after the break.

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The biggest highlight of the newly announced content would be the Tranzit mode, an open-world cooperative game type that let’s players explore a “large map” as they search for new weapons and armaments to keep themselves alive. The new mode is considered the Zombies mode’s campaign and will allow players to freely search the map and travel from place to place via a bus, which has been recently seen in the trailers for the upcoming game.

Also in play are new weapons and “buildables.” Apparently, there are now new “Zombie weapons” to use against the undead hordes, which follow the same vein of the popular Raygun of the earlier modes. The new buildables are more focused on allowing the players to construct an item DIY style for defence or for use as a weapon. One item that can be briefly seen in the trailer is the shield used as mobile cover against the hordes.

The competitive mode mentioned will be called Grief. Nicknamed 4z4, the mode pits two teams of human survivors against one another. The only catch is that they cannot directly hurt one another, leaving the survivors’ only method of winning as sabotage. There are still few details on Grief mode at this point, but the new skill-based matchmaking is supposed to be implemented into Zombies matchmaking as well.

And if you’re concerned that the old fun of Zombies mode will disappear will the emergence of these new modes, Treyarch did make it clear that there would be the “Classic” mode of the previous games.

Call of Duty: Black Ops 2 will be released November 13 for PS3, 360, PC and, at launch, the Wii U.

[Polygon]