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Destroy hostile machines to save the planet in a gorgeous sequel of the steampunk game Iron Heart 2: Underground Army! Here you will arrange your weaponry on the right positions to prevent the machines from invading the military base and then enslaving our planet! There are several campaigns, join all of them to annihilate the threat of invading! Upgrade your machines and don’t forget to spend nuts and stars to improve the characteristics such as machine gun damage and cost. Beat off all the waves and keep your military base safe and sound in the game Iron Heart 2: Underground Army!