Space Invaders is set in a desperate fight for survival as Earth faces an invasion from rows of alien attackers. The battle begins at the top of the screen, where a steady stream of bomb-dropping aliens march towards the bottom. You control a laser cannon at the bottom of the screen, tasked with defending the planet and earning points by shooting the invaders before they land.
The gameplay is fast-paced and intense as you must shoot the advancing aliens to prevent them from reaching the bottom of the screen. Each time the end of the screen is reached, a new row of aliens drops down, bringing the threat closer to your base. You can also take aim at a flying saucer that occasionally passes by along the top of the screen, earning extra points for each successful shot.