ObsCure (2004)

For some time now, Leafmore High School has been the setting for unexplained disappearances. In this survival horror game, you take control of a group of 5 American students. With your friends, you try to unravel the mysterious happenings at this unremarkable-looking school. The night will be long and survival will not be easy... A few years ago, strange things started occurring in the usually quiet American school of Leafmore. Some students are said to have heard awful screams, and there is the talk of mysterious disappearances. After one of their friends mysteriously disappears, a group of students decides to investigate the disturbing events. One evening after class, they stay behind and are locked inside the school, determined to discover what is going on. Down long, dimly-lit corridors and in dark classrooms, Shannon, Kenny, Ashley, Stan, and Josh will try to find out why their school has become so terrifying - and will try to stay alive.