Well explained if this is your first dip into cross logic. But again, after the first 5 games, the adverts after every level, take longer than the game play. I understand that they want/need/should get paid for the work that goes in to it. But it is too much for me. I get bored and frustrated. I start getting in to the headspace to play, but then you have to sit around waiting for the advert to finish! At least the time wasn't wasted. It gave me time to find a different game. Sorry.