THIS IS NOT A TEST. DO NOT IGNORE THIS MESSAGE. THE PRESIDENT OF THE UNITED STATES HAS DECLARED A NATIONAL EMERGENCY. THE SPACE INVASION HAS BEGUN. PLEASE TAKE SHELTER AND STAY INSIDE. Move Left: Left Move Right: Right Reload: Up + Down Fire: Space Shoot the aliens before they destroy the planet. Don't get shot by powerful lasers.
Nicknamed "sweep" because of a popular strategy that players use. I highly recommend using "sweep" to eliminate large quantities of aliens at a time.
