The Earth is under attack. An alien civilization is using Asteroids to destroy the Earth surface and conquer our world.
Your mission is to stop this attack destroying all the asteroids in your assigned area.
But pay attention. The aliens have spotted our defenses and are launching high destructive bombs. You MUST destroy all of them or even if a single one land your tank will be destroyed.
But there is someone who is helping us. We have friends who are sending power ups, get them and become more powerfull.