The Mac port of Left 4 Dead 2 is set to launch on Tuesday, Valve has announced. Players assume the role of one of four armed survivors, trapped in the middle of a zombie apocalypse ravaging the American south; five primary campaigns chronicle the group's escape. While playable with AI teammates, the game is meant to be experienced online, where modes such as Versus and Survivor allow a second four-player team to control the zombies.
