Great concept, but rubbish in reality. Too many adverts. I understand that it's how you make money but after every 1 or 2 challenges is frustrating. Also, the advert is for the same thing, but they have 2 or 3 separate ads for it before the next level can be played. I would have given more stars but the levels kept repeating after a while as well. Deleting the game and hope it gets better in the future