Although its sequel broke down a boarded-up door and burst onto Steam for Mac back on October 5, the original Left 4 Dead was expected sometime before Halloween. Well, that "sometime" equals "today" and it's on sale for $9.99. (Or, be a savvy survivor, and opt for the $14.99 L4D plus L4D2 pack!)
Set in the immediate aftermath of the long-awaited zombie apocalypse. L4D's survival co-op game mode is played out across four sprawling "Movies" set in a variety of urban and rural environments. Each "Movie" has an over-riding team objective, is comprised of five large maps, and may be played by 1 to 14 human players.