Left 4 Dead may have contended for Game of the Year back in 2008, but it's entirely new to Mac owners. Valve has released the bloody affair for the Mac via Steam. Prepare for zombies, cooperative gameplay, zombies, various weapons, zombies, gore and...you know.

To add to that, the game is currently available for half price as part of the the big Halloween sale over at steam. You can join in on this very grisly affair for just $10. Happy hunting.