Room 404

Dear Tenants, Recently, residents have frequently reported strange noises emanating from the fourth floor late at night. After investigation, the elevator service at the fourth floor has been suspended temporarily. We apologize for any inconvenience. If you find yourself trapped on the fourth floor, please stay calm. Observe observe observe observe observe carefully the corridor on the fourth floor. If no anomalies are detected, please return by the same route. If any anomalies are found, proceed forward. Room 404 is a first-person walking simulator. Players must discern anomalies within an endlessly looping corridor, make decisions, and attempts to unravel the mysteries surrounding themselves and the four floors of the apartment.