Deus is a survival Simulation Game, and the sequel to Robinson's Requiem. The player again assumes the role of Robinson's Requiem protagonist Officer Trepliev, who has become a bounty hunter for the Alien World Exploration department. The player's goal is to save a scientific research station from a group of terrorists called the New Crusaders. Like Robinson's Requiem, the game features complex health monitoring and surgery systems; however, the game now contains an optional "action mode", which removes these systems.