Due to the popularity and proven success of Galaxian, released in 1979, Namco created and released Galaga just two years later in the midst of the Golden age of video arcade games. Similar to Galaxian, Galaga is a fixed space-shooting arcade game. It was developed and published by Namco in Japan and published by Midway in North America in 1981.
Although similar at first glance, Galaga is actually somewhat different. Galaga added a lot of new features not featured in Galaxian. For example, the game is smoother and faster than it's predecessor. It also features updated sound effects and graphics and new gameplay elements like the tractor beam and consecutive multiple on-screen shots. In addition, Galaga added and was one of the first games to feature bonus stages.
Galaga was followed with two true sequels Gaplus(1984) and Galaga '88(1987). Galaga is believed to be one of the most entertaining game in the series and in all of arcade gaming history. Because of its popularity, it has been ported to many home video game consoles through the years.