I am up to 21 now...
blocks 15,16,17, and 18
blocks 19, 20, and 21
A nice pile o'stars!! I may be a quarter of the way there now...
Here's the gang so far all together.
This is the link to their instructions:
use this link and scroll to the bottom purple link for the instructions.
And where to buy if you've caught the bug:
Bloc Loc DIT Stars