Mental Hospital 3 is a mystical horror game from the first person. Our story began quite ordinary. The main character received an offer to record a video of a special forces raid on one of the psychiatric hospitals where secret experiments were to be carried out. It sounds easy enough, but he will remember this night forever. Everything went wrong from the very beginning: terrible weather, problems with the news and a car breakdown. Arriving at his destination late, the main character decides to find Lieutenant Sidorov as soon as possible, hoping to shoot at least something. When the main character gets to the hospital and meets its inhabitants, he realizes that it will be almost impossible to describe what he saw there.