This is the 4th Age of Defense game. As usually, you're protecting your castle from the the bad guys who try to destroy it. You have 2 means of protection: Throwing stuff on the enemies' heads and releasing your units who will fght the invaders. Like in some other games of the kind, you start from the stone age and your develop your technology step by step until reaching futuristic levels. You can unlock new units or improve old units' skills betwen levels.
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