The adventure mode is extremely similar to Co-op Objective from Uncharted 2: Among Thieves - two to three players must complete objectives while battling enemy AI. Unlike Uncharted 2, which featured individual levels unrelated to each other, Uncharted 3's Co-op Adventure mode contains a loosely-connected, linear narrative side story that takes players to environments from Uncharted: Drake's Fortune, Uncharted 2, and Uncharted 3 as Drake and the gang hunt down yet another elusive treasure.