ok this is how u beat it. when u get the first big asteriod make sure not to let it go of the screen for 600 seconds lol. u can stop it from going off the screen with yur bullets. Just DONT GET ANY TURRETS. Oh and make sure u have a shield once it eventually goes off the screen cuz it gets hard as heck. The highest ive ever gotten doing that was about 1700 seconds. it gets really boring holding that rock in the air for that long.
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