Alien war is a thrilling game with the concept of defense. You have to protect your castle with your upgradable guns and guided missiles from the invasion of alien troops. In each stage, you are supposed to destroy the invaders and earn as much gold as you can. Play Tower Defense Alien War online at friv20.org. You can play it in fullscreen to have fun with it. Tower Defense Alien War is a great Friv 20 game to play with no cost.

Use Left Mouse button to Interact/Action,

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