Mysterium is a cooperative deduction board game adaptation developed by Asmodee Digital and released in 2017 for PC, Linux, iOS, and Android. Set in the 1920s, it places players in Warwick Manor, where a ghost attempts to communicate with a group of psychics to reveal the circumstances of a murder — identifying the killer, weapon, and location. The ghost conveys information exclusively through illustrated Vision Cards representing abstract dreams and visions, which the psychics must interpret to piece together the truth. Players can take either role: the ghost directing others through visual clues, or a psychic working to decode them. The digital version supports up to seven players in online cross-platform multiplayer, local pass-and-play, and solo modes with AI companions. A story mode explores each psychic's background, and a clairvoyancy variant adjusts gameplay. Expansion cases and additional dream cards are available through an in-game shop.
