Rows of aliens are creeping down toward Earth, and you're the last line. Shoot them down before they land, and stay light on your feet when they shoot back.
Your cannon rides along the bottom of the screen. Slide it left and right, fire upward, and pick off the marching aliens one by one. Here's the catch: the fewer that are left, the faster the survivors move, so sloppy shots will cost you. Tuck behind the bunkers when the fire gets heavy. And keep half an eye on the top of the screen, because that mystery saucer streaking across is worth bonus points if you can tag it.
Left / Right arrows to move, Space to shoot.
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