OD: Knock is a single-player horror game in which players navigate through a series of intense, fear-inducing scenarios designed to test their psychological limits. In this game, the storyline revolves around a mysterious, unsettling environment where players must confront their deepest fears while uncovering a disturbing narrative that blurs the line between reality and hallucination. It stands out with its innovative approach to horror, combining elements of interactive storytelling with cinematic techniques, and challenging players to manage their fear levels as they progress through increasingly terrifying situations.