Penumbra: Overture

Penumbra: Overture is a survival horror video game and the first episode in the Penumbra series played by Markiplier.

Gameplay
The game's main focus is on exploration and classic adventure game object interaction: examining and collecting objects and using them to solve puzzles. Essential to puzzle solving is the ability to read written notes scattered around the mine by its previous inhabitants, which often offer clues or solutions as to how to get past a certain area, as well as providing plot exposition and character development. Overture also offers several physics based puzzles where certain objects must be moved or manipulated in real time. There are no firearms in the game, so during combat the player is limited to improvised melee fighting with a hammer or pickaxe, or throwing objects at attacking creatures. The game is designed to emphasize stealth and avoidance over direct conflict. For example, Philip can close doors behind him to temporarily hold off attacking enemies.

Story
Philip, a thirty-year-old physicist whose mother recently died receives a mysterious letter from his supposedly dead father. Philip follows a series of clues that lead him to a mysterious location in uninhabited northern Greenland. The harsh cold forces him to take shelter in an abandoned mine. Unfortunately, the mine's entrance collapses as he enters it, and he is forced to move deeper inside, slowly unraveling its past and horrific secrets.

Sequel
On February 12, 2008, a second installment titled Penumbra: Black Plague was released. It shows the protagonist Philip moving away from the abandoned mine setting of the original to explore an underground research base.