Like Ridley, Kraid can be fought a number of ways. The easiest, however, is to get near him, use the Morph Ball and continuously lay bombs. You can also get right next to him and blast away with rapid-fire missiles. In either case, he should be done in no time. Kraid gives you an upgrade of 75 missiles upon his defeat. There is also a hidden Energy Tank on the right wall of Kraid’s room. If you need to, use this tank to replenish all your energy during battle.