Wonder Defense Chapter Earth — offers new ways to interact with your world, expanding your military power across the Earth. Fight an unknown alien force to find new residential areas on Mars if you survive. Try to survive against aliens of unknown origin. Improve 57 perks to survive. Collect rare minerals and help your engineers work wonders. Fight the enemy with the military units that you have. Beware of natural disasters. Complete missions to earn money. Use nuclear weapons to destroy the enemy. Deploy your troops to protect the wonders.