Compatible emulators

Synopsis

The Earth is under fire from alien bombers, you must defend it! The enemy ranks start at the top of the screen and you control a laser cannon, located at the bottom of it. Your goal is to earn points by destroying the aliens before they can land. The alien ships are constantly moving between left and right. Each time they approach an edge of the screen they go back in the other direction, going down a notch. Destroy them all and you'll reach the next level, of higher difficulty, but if one of them manages to land, it's lost.

From time to time, a flying saucer will appear at the top of the screen, destroy it to get extra points. Above your laser cannon, three shields can protect you from enemy bombs but they also block your shots. You start the game with a limited number of cannons, if they are all destroyed the game ends.

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