Ads every other tap. Must watch ads to get coins to unlock wallpapers. Free coins every hour. Most wallpapers cost over 100 coins. No previews of wallpapers showing movement, stills only until purchased. The ads are so heavy that you must watch a minimum of 30 seconds to 1 minute before doing another 2 or 3 taps and then another set of ads. Not data friendly at all. If you do use this please use it on wifi. No pay to unlock feature or to remove ads. I'd give it negative score if I could.