Penumbra: Requiem

Penumbra: Requiem is an expansion pack for Penumbra: Black Plague.

Story
The story concerns Philip, during his struggle with the Tuurngait virus, where he participates in sequences reminiscent of other parts of the facility. The game is much simpler than the main games within the series, with no threats from monsters, and only needing to collect keys to unlock portals.