Global Defense System is totally addicting arcade game fun.

Earth is under attack from a killer asteroid storm, and only the Global Defense System can save us from total annihilation! Shoot the asteroids as they enter Earth's atmosphere to destroy them or knock them off course.

It's up to you to save the world from a wave of asteroids that are heading straight towards earth! Upgrade and buy weapons platform between levels. Every weapons platform has the capacity to hold up 2 types of ammo. Keys Q, W, E select secondary ammo while keys A, S, D, select main ammo for platforms 1, 2 and 3. Earn cash by destroying asteroids. Automated turrets can be purchased. Turrets require visibiliity in order to function well. You can increase visibility between levels.