Fun way to pass time, but one star. User is constantly bombarded by a pop-up to watch ads for hints, even though there's a clearly marked icon up top that shows the exact same thing. No need to be incessantly pestered with the pop-up, it's distracting and a source of aggravation. Sit idle for 10 seconds: pop-up. Zoom in and scroll around: pop-up. It doesn't mean I need hints.. I've even paid for no-ads but I'm about done using the app due to this. Make it a toggle in the settings, at least.