Way too many ads, and they all disable your phone's playing audio. I like to listen to podcasts and play to relax, and my podcasts get interrupted every 15-30 seconds, which is how long most rounds take. The premise is fun and soothing, the rounds themselves function well enough and are interesting enough, but the overall execution is ruined by the constant interruptions. A player shouldn't spend more time viewing ads than actually playing.
Julie Seals