Easy Red Orbs
If you need red orbs to buy purple and blue orbs or for noobs to DMC, healing items then on the 7th mission there is a red statue. Use the devil trigger boost at the statue and start attacking it with basic combos, get as many hits as you can on it before it smashes to bits and you'll get about 4000 red orbs. Restart the mission, rinse, repeat for as many orbs as you need, patience is required if you want the orb millionaire achievement.
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