ROOM-9 is a short single-player puzzle game set within a strange corridor system. Players wake in an unfamiliar place with only limited guidance and no clear understanding of how the space works. By exploring repeating hallways and entering different rooms, they gradually uncover new mechanics, patterns, and fragments of meaning. Some rooms focus on observation and memory, while others challenge timing, repetition, and perception. Rather than fully explaining itself, ROOM-9 encourages players to piece together understanding through exploration, experimentation, and failure. The game focuses on atmosphere, uncertainty, and gradual discovery, allowing each player to interpret the experience in their own way.