Left 4 Dead 2 has added a new official campaign, made by fans
Eight years after its last major content update, Left 4 Dead 2 has mutated all sorts of newness with The Last Stand. Made by fans but released officially by Valve, the huge free update has added a new mini-campaign based on the first game's lighthouse Survival mode map, dozens of new maps for Survival and Scavenge modes, new weapons, and loads of wee tweaks and…