

Mark plays as Miles Upshur, a private investigative journalist who gets an anonymous tip about illegal activity at the Mount Massive Asylum for criminally insane. Mark runs into separate characters as he tries to escape, such as a priest called Father Martin that prevents him from leaving the asylum, two nude twins, Richard Trager, an insane doctor that cuts off two of protagonist's fingers, and a large man with a fascination of pigs called Chris Walker. In addition, Miles may survive encounters with assailants by hiding inside staff lockers or under beds more intelligent opponents may search the room for an allocated period before moving on.

Without any traditional weapons, players have to navigate the facility's ransacked environment with parkour: vaulting over low obstacles, crawling, and sliding through narrow gaps. The protagonist, reporter Miles Upshur, is incapable of combat, except for scripted sequences allowing him to shove enemies out of his way. Its presentation is similar to the found footage genre popularized in horror films. Outlast centers around a story driven survival campaign told in first-person narrative and set in a dilapidated psychiatric hospital overrun by homicidal patients.

A sequel for the game was released titled Outlast 2. He has completed the main game as well as the Whistleblower DLC. Outlast is a first person survival horror video game played by Markiplier.
