I can't pass level 33 (stage 1) in puzzle mode :( Anyone can help me?

I struggled with that one too then finally figured it out...

Put the first black ball next to another black ball in the left chain
Put the purple ball next to another purple on the right chain
Put a yellow ball next to a red ball on both the left and right chains
Change the purple balls to green
Change the yellow balls to yellow
Shoot the first white ball at the lower left chain (causing it to combine with the upper left chaing)
Shoot the next white ball at the upper left chain to finish it off
Shoot the last black ball at the right chain and voila!

Now I'm stuck on 34...haha