A Real-Time 3D Strategy, Besieger is set in a medieval fantasy world in which rival players wage war as either Viking or Cimmerian warriors. This story-based game involves a series of quests that determine the game's eventual outcome. As well as the bloody battles, each player must create an economy to allow them to construct or upgrade 40 types of buildings and more than 50 different units for battle. They will also 'create' and train workers for fighting and other survival skills. This experience and fighting efficiency carries over as each level is conquered.