The Missiles are the weapon thats used by the Left Trigger, you can lock onto six enemies at a time with them and when fired will only take away 1 shot regardless of how many enemies you've locked on to. You are allowed to cary 12 missiles at a time and they are picked up as a power up when playing through the levels. Every time you pick up one of the power ups it will add 4 more shots to your current missile total.