Set in a zombie apocalypse, the player assumes the role of one of eight remaining survivors,[1] with a focus on co-operation and survival.

In Survival mode, players must protect certain sectors of a level against waves of incoming zombies.

The player can change the method of counting ammunition from showing the ammo counter, having their character's voice call out often a vague estimate, or both combined.

If a player dies in the middle of a Survival map, they will respawn at the start of the next wave or instantly if they have gained enough points beforehand which is subjected to the game server's difficulty level.

Players can also have access to explosives such as grenades and TNT which are helpful in dispatching large hordes of zombies.

No More Room in Hell was named "Mod of the Year" for 2011 by PC Gamer magazine, and was featured in two issues in 2012.

Since it failed to place higher than the previous year, attaining the same ranking as 2011, it did not make it into the official Top Ten list and was supplanted by Cry of Fear.

[5] Although No More Room in Hell was well received because of its realism and its gameplay, there was a significant source of controversy over the inclusion of zombie children.

Part of our goal was to create a zombie game not based on killing and action, but on tension and fear and moral and ethical choice.

Reading some posts by players off-put by the zombie children, being unable to shoot them on first encounter.. that is something that we set out to achieve.

"[7]On October 28, 2016, a teaser trailer was posted on the official No More Room in Hell YouTube channel.

[12] On June 7, 2024, it was announced through an official trailer at the Summer Game Fest 2024 that No More Room in Hell 2[13] will release through early access on Halloween, though this was later revised to October 22nd.

[16][17] Torn Banner Studios has issued hotfixes to address bugs, but the game remains rough and repetitive, needing more content and polish for a full release.