Species: Unknown is a first-person survival horror game designed for Windows, offering both solo and online co-op gameplay for up to four players. Players assume the role of mercenaries aboard a deserted spaceship, tasked with executing high-risk contracts while contending with an unseen predator. The game emphasizes teamwork and strategy, as players must collaborate to survive and complete their missions.

Each contract presents unique challenges, ranging from extracting vital data to eliminating threats or even destroying the ship to contain dangers. The gameplay experience is dynamic, with varying objectives, environments, and intelligent adversaries that adapt to players' actions. This creates an engaging atmosphere where strategic planning and cooperation are essential for survival.