This game is also available on PS3.
Here's another great method to get even more orbs on the third mission. The technique is similar enough in the beginning to the one above -- you'll want to seek out the same wooden wall that can be broken down. Kill the enemies there after breaking down the wall, then backtrack to the red crystal in the area. Hitting it with your sword will give you 850 orbs right off the bat. But if you power up (using Devil Trigger) and attack it, you'll get over 3,000 orbs! This only takes a couple of minutes to accomplish, and like the technique above, can be repeated at will.