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Galaxian (ギャラクシアン ) is an arcade game developed by Namco in October 1979. It was published by Namco in Japan and was imported to North America by Midway that December. A fixed shooter-style game in which the player controls a spaceship at the bottom of the screen and shoots enemies descending in various directions, it was designed to compete with the successful earlier game Space Invaders.
The game was highly popular upon its release, and has been a focus of competitive gaming ever since. It spawned a successful sequel, Galaga, in 1981, and the lesser known Gaplus in 1984, as well as many later ports and adaptations. Along with its sequel, it was among the most popular games during the golden age of arcade video games.[Wiki]