The Insomnis is a first-person horror game that relies on storytelling, exploration, and puzzle-solving to progress through a terrifying atmosphere. Players take on the role of Castevet, who must deal with a mysterious inheritance he has just received and uncover all the secrets of the Castevet mansion in the process.

Once there, Joe will begin to explore each room in search of answers. As the hours pass, the old house becomes a dark place, and he will discover that he is not alone in his grandfather's beloved home. Countless secrets and mysteries await him in the haunted Castevet mansion!