No More Room in Hell is a cooperative first-person survival horror video game created by Matt "Maxx" Kazan and initially developed as a modification on Valve's Source game engine. Set in a zombie apocalypse, the player assumes the role of one of eight remaining survivors, with a focus on co-operation and survival. The game can be played through "Objective" or "Survival" mode. It is heavily inspired by George A. Romero's Living Dead series, with the title being a reference to Dawn of the Dead, specifically the line "When there's no more room in hell, the dead will walk the earth.", and some characters being references to other films such as American Psycho and The Big Lebowski.