No More Room in Hell is a Source Engine mod. The beta was released on Halloween 2011, after nearly seven years in development. The game is inspired by the Living Dead movies of George Romero. The title is a quote from the movie Dawn of the Dead, "When there's no more room in hell, the dead will walk the earth."The zombies in the game are computer-controlled. Up to eight players can play online as the survivors of the zombie apocalypse.