SPACE INVADERS ATARI 2600

Earth is under attack from rows of alien bombs and you must defend it! Rows of aliens start at the top of the screen, and you control a laser cannon at the bottom of the screen. Your objective is to earn points by shooting the aliens before they can land. The aliens walk back and forth, and each time the end of the screen is reached, they drop down a row closer to the bottom. Shoot them all and you go to the next (more difficult) level, but if even one of them lands, the game is over. Occasionally a flying saucer will pass along the top of the screen; shoot it to earn extra points. Just above your laser cannon are three shields; these can be used to hide from alien bombs, but will also block your own shots. You start the game with a limited number of laser cannons, and if all of them are bombarded, the game ends.