Global Defense System

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It's up to you to save the world from an incoming wave of asteroids careening directly towards Earth! Your powerful cannons are the main defense Earth has against devastating destruction - stop the asteroids! Upgrade and buy additional weapon platforms between the game's numerous levels. Every weapons platform has the capacity to hold up to 2 separate types of ammo. The Q, W, and E keys on your keyboard select secondary ammo, while the A, S, and D keys select primary ammo for platforms 1, 2, and 3. Gain more funds by destroying the incoming asteroids. If you save up enough money, you are able to purchase automated turrets. As the name implies, these do not require your manual control - they'll fire shots off automatically; but keep in mind that they require good visibility to function optimally. You can upgrade the visibility with money earned between levels. Do everything you can to save Earth in this addictive and highly challenging game!