Killing Floor 3 is a cooperative first-person action/horror shooter set in a dark sci-fi future where players take on the role of Nightfall specialists. Teaming up with up to five others, players battle waves of bioengineered monsters known as 'zeds' across various maps. The core gameplay focuses on intense combat, earning in-game currency to upgrade a customizable arsenal of weapons, and enhancing specialist skills to survive increasingly difficult assaults. The game supports both solo and 6-player online co-op.