Headshot!, This is my Rifle, Pick Your Mutation

Headshot!
The only shot that counts is the one in the head.

Shoot them in the arm, shoot them in the leg, shoot them in the chest - it just doesn't matter! The only way these zombies are going down is with a head shot. Other hits will stumble them back, but only a head shot or decapitation will kill them.

Room For One, Everything Must Go, Favorite Weapon Class

New Mutation
Room For One
Only room for one survivor in this rescue vehicle.

Chainsaw Massacre, Loving the Dark, Is Less More, and Last Video on Earth.

New Mutation
Chainsaw Massacre.
4 chainsaws, millions of zombies.

You are armed with the only thing you need to survive a Zombie Apocalypse, a chainsaw. Rip apart thousands of zombies on your way to safety.

Last Man On Earth, Special Infected Love, Favorite Campaign, and Last Video on Earth.

Week 5 of the in game blog: Return of the Gnome and Realism Versus and Pick Your Favorite Infected.

Week 4 of the in game blog: New Mutation, Angry and Confused, and Pick a Mutation.

New Mutation
Last Gnome On Earth
Protect the gnome at all cost.
Do you crave attention? Want all the infected to swarm you and the gnome you are carrying? Then we have the game mode for you. The team needs to carry the garden gnome from start to finish in any campaign. The common infected hate the gnome and will swarm whoever is carrying him. Watch out putting him on the ground, a boomer explosion will send him flying!

Week 3 of the in game blog: New Mutation, Landslide Victory!, and what rages you?

New Mutation
Follow the Liter
Scavenge one can at a time.
No more fighting over what cans to grab first. This Mutation spawns only one group of cans at a time, so survivors know exactly where to go. There is only one problem: the Infected know exactly where they are going.

This week we introduce a new mutation, reveal poll results, put the game in your hands, have a Boomer sighting, and more!

New Mutation
Bleed Out
Your health is a ticking away!

"The Passing" is now available on the Xbox 360 and PC!

The first game add-on for Left 4 Dead 2 (L4D2) brings the original Left 4 Dead Survivors down south for a meeting with the L4D2 cast, while delivering new single-player, multiplayer and co-operative gameplay for the PC and Xbox 360.

The Passing introduces a series of weekly game mode events dubbed "Mutations." These are week-long runs of new gameplay modes that range from "Realism Versus" to "Chainsaw Massacre". Each week one new Mutation is featured and the previous Mutation retired.