Outpost: Infinity Siege combines action and strategy in a hazardous world where preparing a base is part of the expedition. Players gather resources, then merge and upgrade outpost units to shape their own outpost. That progression gives exploration a practical purpose: trips into new zones can yield stronger units, while their hazards make each venture more than a simple supply run.
Combat centers on the distinctive XEN Firearm, whose protoslag attributes and varied ammunition offer different ways to use the weapon. Exploration also brings together loot and farming across distinctive maps, with multiple difficulty levels and varied gameplay features. Rather than separating construction from combat, the design links gathering, upgrading and fighting as parts of a continuing push into dangerous territory.
The game supports both solo play and cooperative action. Friends can fight together on Recovery Day, or cooperate in Endless mode to withstand successive waves of monsters.
