The game was critically well received, earning two awards from the Independent Games Festival and numerous positive reviews. Released for Windows, Mac OS X, and Linux platforms, the game features a protagonist named Daniel exploring a dark and foreboding castle, while avoiding monsters and other obstructions as well as solving puzzles. Digital distribution, DVD, Cloud computingĪmnesia: The Dark Descent (previously known as Lux Tenebras or Unknown ) is a survival horror video game by Frictional Games, who previously developed the Penumbra series.