Brilliant game; ads are not too intrusive, gameplay isn't frustrated by the need to constantly purchase things. All around, it's one of the best free games I've ever played. You could play it all day long if you wanted to, but it doesn't require you to check in every day (although it rewards you for doing so). The storyline is rich, the art is great, there's lots to learn. One thing is missing: I'd like to be able to invite friends to play from the app so they can join my clan directly.