Good game concept but some design flaws. Can't read challenge text at night, night time doesn't add to the fun of the game, it just means you can't see properly, plus the challenges are often simply not possible because opportunities don't arise, eg hovering onto a reindeer. Would be better if the whole point of the game was to do challenges explicitly set one after the other with the opportunity set up in front of you. It gets tedious trying to do challenges when the opportunity rarely arises.