Hordes of invaders are emerging from the bowels of the earth to enslave the people of the surface. Follow the opposition of the defenders in the planet's against an army of steam-powered robots in a rare Victorian-era steampunk atmosphere!
Enterprise through the icy mines and conflict in an abandoned underground city. Protect your base by putting towers in tactically advantageous positions and use abilities that are special to overcome the soulless steel military. Each level will take you farther into the depths of the planet in search of the wellspring of threat. Your task is to defend your machines from various enemies – armor protects some, some fly and others are vulnerable only to electricity.
Use approaches to exploit your enemies' weaknesses and attain victory. Prove your mettle in a storm of steam and fire!