Galaga is a fixed-shooter video game that was made and sold by Namco in Japan in 1981. It comes after Galaxian, which came out in 1979. In Galaga, the player controls a spaceship that is at the bottom of the screen. At the start of each stage, the area is empty, but over time, enemy aliens fly in order. Once all of the enemies are on screen, they will either shoot or crash into the player's ship as they come down. The player can shoot at the enemies during the whole stage, and when all of them are dead, the player goes on to the next stage.
To start Galaga, press the ENTER key (you might have to press it twice). Clicking the Game Window Size button on a computer lets you switch between the normal, 1.5X, and 2X game window sizes. To play and start the game on your cell phone or iPhone, use the buttons that appear on your screen.