Use the following trick to get approximately 4,300 Red Orbs in about twenty seconds. At the start of the mission, destroy the rocks to your left. Enter the tunnel, and destroy the rocks. You will see the big red crystal near the Secret Mission. In order to get the most Orbs, start with the Stinger, then immediately activate Devil Trigger mode, and quickly mash away. Then, press Start, select "Systems", and choose "Retry Mission". This is the easiest way to get a lot of Red Orbs in a short amount of time.