Use the following trick to collect 4,300 Red Orbs in about twenty seconds. At the start of the mission, destroy the rocks to the left of you. Proceed into the tunnel and also destroy the rocks that are there. You will see the big red crystal near the Secret Mission. In order to get the most orbs, start with the Stinger then immediately go into Devil Trigger mode and quickly mash away. Once done, press Start, go to "Systems" then "Retry Mission". This is the easiest way to get a lot of Red Orbs in a short amount of time.