Outlast

"After receives an anonymous e-mail that inhumane experiments are being conducted at Mount Massive Asylum, a private psychiatric hospital owned by the notoriously unethical Murkoff Corporation. Upon entering, you are shocked to discover its halls ransacked and littered with the mutilated corpses of the staff. He's informed by a dying officer of Murkoff's private military unit that Mount Massive's deranged inmates, known as "variants", have escaped and are freely roaming the grounds, butchering Murkoff's employees. The officer implores you to escape and reveals that the main doors can be unlocked by security control. But you know that this asylum wont let you escape that easily."