Acronyms all over the place here, but it’s well worth it. Valve announced that upcoming the upcoming Survival Pack for Left 4 Dead will be completely FREE on both the Xbox 360 and PC. If you just wet your pants, I’ll let you change.

Ok, now that your pants are dry, it’s time to hear what’s inside. The free DLC will include a new multiplayer game mode, Survival, as well as two complete campaigns for Versus Mode (Death Toll and Dead Air).

I’ve gotten away from L4D recently with other games calling my name, but this DLC will certainly bring me back. What about you? I don’t want to hear any excuses, it’s free.

Here’s the full press release:

L4D DLC: FREE ON 360 & PC

February 11, 2009 – The recently announced Left 4 Dead Downloadable Content (L4D DLC) will be delivered to Xbox 360 and PC gamers free of charge.

Due for release this spring, the DLC for 2008’s best-selling new game property on the PC and Xbox 360, is dubbed the L4D Survival Pack and introduces a new multiplayer game mode entitled, Survival, plus two complete campaigns for Versus Mode (Death Toll, Dead Air). A Critic’s Choice Edition of the game will be heading to retail stores this spring, and will include access to all the content introduced in the L4D: Survival Pack.

Left 4 Dead is a survival action game from Valve that blends the social entertainment experience of multiplayer games such as Counter-Strike and Team Fortress with the dramatic, narrative experience made popular in single player action game classics such as the Half-Life series of games. Released in November of 2008, L4D has earned over 25 industry awards from outlets around the world.

For more information, please visit www.l4d.com