Galaxian on the Atari 2600 by Namco

A fixed shooter 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 Taito Corporation's successful earlier game Space Invaders (which was released in the previous year, and also imported to the US by Midway Games). The game was highly popular for Namco 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 and Galaga '88 in 1984 and 1987 respectively, as well as many later ports and adaptations. Along with its immediate sequel, it was one of the most popular games during the golden age of arcade video games.

The gameplay is relatively simple. Swarm after swarm of alien armies attack the player's ship that moves left and right at the bottom of the wraparound screen. The ship can only have one shot on screen at a time. The player defeats one swarm, only to have it replaced by another more aggressive and challenging swarm in the next stage. A plain and repetitive starfield scrolls in the background.