I finished Puzzle Kingdoms. Honestly, I was a bit disappointed by the ending. I was expecting a big boss fight that never came. I simply had a much harder puzzle to destroy the final daemon box, but that was it.
Oh, well! It was still fun and well worth the purchase! I'm going to play through again with a new hero and try out new strategies. I may see if I can beat the game with a "weenie army"....all small, fast troops with low defense. :)