Space Invaders is the grand daddy of all space shooter games. It was released in 1978 by Taito in Japan, and distributed in the North America by Midway.
The object of the game is to defend the planet against waves of alien invaders as they descend from the sky. The player controls a laser base, moving it back and forth to shoot the aliens or hide behind a set of shields. The game’s designer, Tomohiro Nishikado, took advantage of the limitations of the game’s hardware: The game moves slowly at first due to the large number of alien sprites on the screen, but as sprites are eliminated the game becomes faster and more frantic.