The ads ruin the "zen". Ads with increasing frequency. Three part ads; a video plays. After a few seconds you can skip it. Then it takes you to a still picture of the ad that you have to wait a few seconds to exit from, then a third part offering to bring you to the app store to download the product plugged in the first two parts of the ad. When I click the "X" that means NO, I am NOT interested. Take the hint. Botrom line; Ads ruin this game.