To collect 4,300 Red Orbs in about twenty seconds,destroy the rocks to the left of you at the start of the mission. Go into the tunnel and also destroy the rocks that are there to find the big red crystal near the Secret Mission. In order to get the most orbs, start with the Stinger and immediately go into Devil Trigger mode, then 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 quickly.