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Free and open-source real-time strategy game featuring physics-based combat, smart unit AI, large-scale multiplayer battles, and hundreds of unique units.
Zero-K is a free, open-source real-time strategy (RTS) game built on the Spring Engine. Designed around physics-based projectiles, intelligent unit behavior, and large-scale tactical warfare, it emphasizes strategic depth over micromanagement. Players can command hundreds of units across land, sea, and air while taking advantage of advanced pathfinding, dynamic terrain, automation tools, and a powerful customizable user interface. Zero-K supports competitive multiplayer, cooperative gameplay, AI skirmishes, and single-player missions, making it one of the most feature-rich open-source RTS games available.