Hordes of invaders are emerging from the bowels of the earth to enslave the people of the surface. Follow the resistance of the planet's defenders against an army of steam-powered robots in a rare Victorian-era steampunk atmosphere!

Venture through the icy mines and battle in an abandoned underground city. Defend your base by placing towers in tactically advantageous positions and use special skills to defeat the soulless steel army. Each level will take you further into the depths of the planet in search of the source of threat. Your task is to defend your machines from various enemies – some are protected by armor, some fly and others are vulnerable only to electricity.

Use tactics to exploit your enemies' weaknesses and achieve victory. Prove your mettle in a storm of fire and steam!

40 levels of varying difficulties!
Earn rewards and upgrade your weaponry
12 types of towers and skills!
15+ special enemy characteristics