Developer: Silicon Knights

The tale of Alexandra Roivas was a memorable one, utilizing spectacular "sanity effects" to give the player a feel for what it must have been like for the heroine. Spanning twelve completely different time periods, it took players back to Ancient Rome and even the cusp of World War I exploring the summoning of the evil Corpse God Mantorok. It's noted as one of the scariest games of all time, but what's really terrifying is the fake "corrupt data" sanity effect.