Fun, smart, short

For me, this is a pricey app. I do feel it is a good teaching resource and like the game, but it's expensive for the length of total gameplay. My children, 6, 7, and 9 like this game and particularly love the reward of seeing the creature grow. I would really like to see an option for parents to see the 'solution key' to the puzzles. As a non mathy person, I can solve the puzzle but often am unable to achieve 3 stars for the amount of moves, etc. I want to know what I am doing wrong! I want to help my child when she asks how she can improve her score, but I don't understand myself. This is my biggest complaint and request for improvement of this game.