Left 4 Dead, An World Where Zombie Apocalypse Is Happening In, With Special Infecteds Such As The Tank, Witch, Charger, Hunter, Jockey, Smoker, Boomer And Spitter, You Can Either Choose L4D1 (Survivors: Bill, Francis, Louis And Zoey) Or L4D2 (Survivors: Nick, Ellis, Coach And Rochelle), You Can Do Anything Here In This Zombie Apocalypse World, Oh You Can Choose Two Teams, Either On The Team Of The Survivors Or The Team Of The Special Infecteds.