1 star: 20000 points
2 stars: 100000 points
3 stars: 130000 points
To score 20 striped candies, your first major concerns are to keep pieces flowing, so you will need to unlock as many of the pieces at the top as you can, and you will also have the chocolate down at the bottom to deal with. If you can make some vertical striped candies and shoot them off to break through the locked pieces, that is an ideal start. You do have 2 cyclones roaming around and 4 chocolate fans up top trying to plug up your incoming pieces. Once the chocolate is clear on the bottom, keep your eye up top and keep making striped candies. If you lose all the spots up top you won’t get any more pieces and are destined to fail. Having the chocolate fans one space apart can take you from 5 open slots to 0 in just 5 moves if you don’t keep an eye on it. Also bear in mind you will get some 5 move bombs dropping from the dispensers as well to make everything all the more exciting. The most difficult part is opening up the top fully and maintaining it.
For all of you that can’t beat Candy Crush Level 423 you need to have a careful look at the following video:
Patricia Frederick’s Tips for Candy Crush Level 423
The fastest way to collect all the striped candies is a color bomb/striped candy combo, but the bombs, chocolate factories and twisters are going to make that difficult.