Valve has officially announced that the first big expansion for their zombie co-op shooter
Left 4 Dead 2, titled The Passing, will be released via
Steam on Thursday. Like previous downloadable expansions for Valve's PC game releases, The Passing will be a free download for
Left 4 Dead 2 PC owners.
Valve has also revealed more details on what will be contained in The Passing, including the addition of Mutations. These will be new gameplay modes that Valve plans to cycle in and out of the multiplayer servers on a weekly basis. More that 20 Mutation gameplay modes are planned. One of the modes is Chainsaw Massacre where the survivors are all armed with chainsaws and they have an unlimited amount of gas. All of the Mutation modes can be played on any of
Left 4 Dead 2's levels.
In addition to the Mutation gameplay modes, The Passing will have a new co-op challenge mode, bot support for infected bosses in Versus mode, the new M-60 weapon, the new golf club melee weapon, the new fallen survivor "uncommon common" zombie.