Eldritch

Eldritch is a 2013 first-person shooter video game developed by David Pittman and published by American indie studio Minor Key Games. It was inspired by the writings of H. P. Lovecraft and gameplay elements of roguelike games. The expansion Eldritch: Mountains of Madness was released in December 2013. The game's source code was released in 2014, though the content itself remains proprietary.