"Eternal Darkness" is a psychological horror video game developed by Silicon Knights and released for the Nintendo GameCube in 2002. The game features a unique narrative structure that spans different time periods, allowing players to explore various characters and settings. It is known for its innovative gameplay mechanics, including a sanity meter that affects the player's experience as they encounter disturbing events. The story revolves around Alex Roivas, who investigates her grandfather's mysterious death and uncovers an ancient evil. Players must solve puzzles and combat enemies while managing their sanity, which can lead to unsettling visual and auditory hallucinations. The game has received critical acclaim for its atmosphere and storytelling.