In adventure mode, break the tops of the circles open, then with a Zen shot each, clear out the middles. With any luck, there won't be too many orange pegs left, and hopefully, none that are blocked by blue. Remember, once the fever meter is at x10 (most of the orange pegs are gone), if you hit a purple peg and four blue, you will get more than 25,000 points for a free ball. Also, use free ball skills to pick off the pegs one by one until you can get to all the orange ones.