Left 4 Dead - FPS - 2008

Left 4 Dead is a 4 player cooperative first-person shooter where players work together to survive against hordes of zombies. Valve invented the co-op zombie survival genre with this title, and it's still a lot of fun to play today. Left 4 Dead can be purchased as a standalone title, part of the Valve Complete Pack, which includes all of Valve's early titles. Watch steamDB for sales.