Okay, finally got level 19. Took a week and many variations on layout before it made sense. By comparison, level 20 was a SNAP (less than 5 minutes). Now stuck on level 21. I got the update, but I haven't seen yet what changed...
I love this game too. Really great brain teaser. But I am stuck on level 5 of pack 3. Can anyone confirm that it is solvable. I just don't see how it can be.