The idea of the game is to shoot out the power source of the level, which is shielded by an iris. One laser shot will force the iris to open, revealing the power source. A second shot will destroy the power source, thus completing the level. To shoot at the power block, you will have to find a way to clear a path for a laser beam to hit it. There are various other blocks such as mirrors and gates that will help or hinder your progress.