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.

The first game add-on for Left 4 Dead 2 brings the original Left 4 Dead (L4D1) 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.

Celebrating the pending release of "The Passing" and the Left 4 Dead 1 and Left 4 Dead 2 teams colliding, we have a few other world colliding events to announce.

That's right, Internet blog readers! It's tax season here at Valve, and we need to CLEAR OUT our digital warehouses! What does that mean for you? How about the award-winning Left 4 Dead 2, now available for 50% off the original price? (March 23rd to March 25th)