This is the most unfunny game I have ever played. If you want others to spend money, just say so directly. After playing one game, there will be ads, and they are forty seconds long. You said fifteen seconds, which I can accept. But the time is so short. I ask the author if you can complete it by yourself. There is basically no thinking. You just match whatever you see. But the time is not good enough. You just want you to use gold coins and then watch ads all the time to make you spend money. You can't play it at all without spending money. Why don't you just ask for money when downloading? You have to wait for others to download and play a few games before ads keep popping up. It's a waste of time and data. I have to say that the advertising is very good and a lot of effort has been put into it. It's a rubbish game. Bad review.