High Quality Content by WIKIPEDIA articles! Eternal Darkness: Sanity's Requiem is a psychological horror video game released for the Nintendo GameCube. Developed by Canadian developer Silicon Knights and originally planned for the Nintendo 64, it was first released and published by Nintendo on June 24, 2002 in North America. It was the first video game published directly by Nintendo, rather than a third-party developer, to be rated M for mature by the Entertainment Software Rating Board.