No, it's not a weird offer or scam, or something you have to refer 3 friends to do. No. It is completely 100% free! No strings attached! Surprising, huh?
But yes, the recently revealed Survival Pack expansion to Left 4 Dead has received a price point: Free. The expansion pack adds two new campaigns to the game and a brand new "Survival" multiplayer mode and will be released for PC and Xbox Live this spring.....for free!