The levels are to easy so you spend more time watching ads. I am made it to level 28 . It has no way how good you did on each level it would be nice if it told you if you did it in the lest amount of moves or if you went over. Then you do so many levels to earn a new background which mean an ad after every single level but to get said background you have to watch another ad or loss it. So they make very very good money for all the ads you watch in my time playing it was about 25sec the ad.