Left 4 Dead will be arriving today on the mac platform and if you have been eagerly awaiting the new Sacrifice campaign your wait is over as that will also be arriving on all platforms sometime today. View The Sacrifice trailer after the jump.
If you already own Left 4 Dead 2 on your PC then you will be able to download it and play it on your Mac at no extra cost.
Not only do you get Left 4 Dead 2 but Steam owners get all the previously released DLC for free! So you get the original 5 Campaigns and “The Passing”, “The Sacrifice” and “No Mercy.”
Via 9to5 Mac