Move the Earth around with the power of your mouse to dodge the waves of asteroids attracted to you by gravity. Get them in a close orbit to destroy them or pick up a Gravity Blast and shoot them out to space. The Earth will explode after 3 hits from anything so watch out!
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For those having trouble figuring out how to get asteroids to orbit you, check out the video url below...
http://www.youtube.com/watch?v=ioaXPnPDObg