You control a base on the bottom of the screen moving left or right, and you have to blast or avoid falling meteors with your laser over five waves. As you avoid or blast the meteors, you also have a panic button which removes all meteors on the screen but using this reduces your bonus. A wave ends when your base is hit and you move to the next wave but with the meteors falling faster. Before you start the game, you can select three levels of difficulty, Slow, Fast and Expert.
