Valve has released news and details of their new upcoming DLC for Left 4 Dead. The new DLC, entitled “Survival Pack” will include a new game mode similar to Call Of Duty: World at War’s Nazi Zombies mode, in which the survivors set up defense at various positions, and hold out against countless infected. It also features the new map, “Lighthouse”, which is a small, defensible map created for the new game type, and lastly for new content, The Dead Air and Death Toll campaigns will be converted for use in versus mode.

Left 4 Dead’s writer, Chet Faliszek, also said that all matchmaking bugs will be fixed.

GamesRadar has exclusive footage and news here.