From Nintendo: Players control their fighters, with their unique ability to combine with other fighters and shoot down the invading aliens. Aliens attack in formations using a variety of attack patterns. Rescue a captured fighter to combine with it, forming a Dual Fighter with twice the firepower. Earn Perfect Bonuses more easily by using a Dual Fighter on the Challenging Stages. Galaga was released in 1981 and became an instant classic with its innovative fighter-combination system and varied enemy attack patterns.