The mechanical invaders are approaching the surface, and they're stronger than ever. Iron Heart 2: Underground Army is the long-awaited sequel to our popular tower defense game! The fierce resistance is gaining momentum. The steam robots, driven by the call of the iron heart, have swarmed into underground tunnels and are just about to break through our defenses. Only your strategic talents can put an end to their iron army!
-A new twist in the fierce resistance
-Destructive secret weaponry
-15 steel enemies
-40 new and captivating levels