Demon's Souls (デモンズソウル Demonzu Souru) is a 2009 action role-playing video game developed by FromSoftware, under supervision by SCE Japan Studio, for the PlayStation 3. It was published in Japan by Sony Computer Entertainment on February 5, 2009, in North America by Atlus on October 6, 2009, and in Australia and Europe by Bandai Namco Entertainment in June 2010. It is the first installment in what became the Souls series of games.
Set in a dark fantasy world, players take control of a hero who has journeyed to the fictional kingdom of Boletaria, which is being ravaged by a cursed fog that brings forth demons who feast on the souls of mortals. The game has been described as a spiritual successor to the King's Field series of games. The gameplay involves a character-creation system and emphasizes gathering loot through combat with enemies in a non-linear series of varied locations. It has a unique online multiplayer system integrated into the single-player where players can leave useful messages and warnings for other players' single-player game worlds, as well as joining other players in their world to assist and/or kill them.