The Mansion of Hidden Souls, titled Real Dream Mansion: Someone Behind the Door... (真説・夢見館 扉の奥に誰かが・・・, Shinsetsu Yumemi Yakata: Tobira no Oku ni Dareka ga) in Japan, is a sequel for the Sega Saturn. The game was developed by System Sacom and published by Sega, and was released in 1994 in Japan, and in 1995 in North America and Europe.