The overall concept of it is simply amazing. I've played a bit and I enjoy it to a certain extent. While I am kinda new to the game app, there are other who have been able to collect massive amount of cards because they've been playing since it launched. I cannot catch up because the Gems are hard to get. Yes, you can get it doing missions, events and the duel quizes.. but let's face it: there are just too many boxes to get. This is looking like a pay-to-win type of game.