[1] It was released for Windows in April 2012, OS X and Linux in December 2012, iOS in May 2015,[citation needed] and Nintendo Switch on 15 January 2024.

Many of the harder puzzles throughout the game are designed as bonuses, being optional to the progression through the dungeon but granting superior items and equipment for solving them.

Using the weapon, which temporarily stuns the machine, the party disassemble the parts which they used to repair the Undying One and deal a fatal blow to it using spells of lightning.

The last scenes show the party running down a stone hallway of the dungeon, before a beam of pale blue light explodes from Mount Grimrock, ascending to the sky.

[9] The developers established an indie video game company called "Almost Human" located at Matinkylä, Espoo in Finland.

On 4 October 2012, with the release of patch 1.3.1, an editor was included which allowed the creation of user generated dungeons & content and led to the development of a vivid modding community.

[15] In 2014 a live-action series, located in the Grimrock universe, from Wayside Creations (the makers of Fallout: Nuka Break) was funded through Kickstarter, but never produced.

[18] Reviewers generally praised the game for faithfully recreating the gameplay of old-school action RPGs into the modern era.

GameSpy gave the game a 4.5/5 "Great" rating, saying that "the best aspect of Grimrock is its puzzles, which have been largely abandoned by RPG developers in this age of Internet hints and walkthroughs.

"[20] Destructoid's Patrick Hancock awarded the game a score of 95/100, claiming "Grimrock takes an old-school feel and injects it seamlessly into the modern era.