Defend Earth from Martians... From Mars! Ever since their crystal mistakenly landed on Earth, the inhabitants of Mars have been trying to get it back. But we found it fair and square, and we're not giving it back! Guide humankind from the Stone Age to modern times while fending off waves of pesky Martians with an arsenal of weapons. Build, upgrade, and man structures and weapons to defend Earth and keep civilization moving forward. Have Fun!
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