Instructions
Enter any temple that requires you to interact with orbs to open a door. Most temples have orb locks, including the Volcano and Ocean temples as well as the Krazoa Shrine.
Locate an orb. All orbs have colored torches in front of them. Align yourself in front of the torch, positioning the orb directly behind the torch's flame.
Press "Y" to take out your Fire Blaster. Aim so the cross-hairs of the Fire Blaster are positioned on top of the flame and orb.
Wait for the flame to turn the same color as the orb. Press "A" when the colors match to fire a shot from the Fire Blaster. The Fire Blaster shot turns the same color as the torch flame and the door unlocks when it hits the orb.