Compatible emulators

Synopsis

Earth is under attack from rows of bombs dropped by aliens, and you must defend it!
The rows of aliens start at the top of the screen, and you control a laser cannon at the bottom of the screen. Your goal is to earn points by shooting the aliens before they can land. The aliens move back and forth, and each time the end of the screen is reached, they move down one row.
Shoot them, and you'll move on to the next (harder) level, but if even one of them lands, it's game over. From time to time, a flying saucer will pass at the top of the screen; shoot it to earn extra points. Just above your laser cannon are three shields that can be used to hide from alien bombs, but can also block your own shots. You start the game with a limited number of laser cannons, and if all of them are bombed, the game ends.

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