Eldritch

The game's source code was released in 2014, though the content itself remains proprietary.

• Title — Eldritch • Designer — David Pittman • Publisher — Minor Key Games • Platforms — Microsoft Windows, Linux, OS X • Genre — First-person shooter, roguelike • Modes — Single-player

Players take the role of a 1920s-era investigator in a Cthulhu Mythos-inspired storyline. Players can wield both pistols and spells. The world is procedurally generated, which means that it is different every time the game is played. The game features a form of permanent death in which all items are lost upon death. Money that has been stored in the bank is retained. After the player wins the game, a new difficulty mode is unlocked, "New Game Plus". Enemies become stronger, helpful items become rarer, and gameplay shifts to a more stealth game-inspired mechanic.

David Pittman wrote and published the game independently after he quit 2K Marin. After his wife, Kim Pittman, helped to finance the game's development, he budgeted for a December 2013 release. He began publicizing the game in September, and unforeseen circumstances pushed the release date forward to October.

Eldritch was released October 21, 2013. When there were complaints about the shortness of the game, Pittman created a free expansion based on At the Mountains of Madness, a story he had wanted to include more of. Eldritch: Mountains of Madness was released in December 2013.

In April 2014, the game's source code was released to the public under a permissive zlib license, though the content remains proprietary. While still being sold, the game became open-source software, and was ported to alternative platforms like the Pandora.