It's one of the best mobile games I have ever played. It's fun to grind and improve your character day by day. However, you have to pay to be able to play otherwise the game is too slow that you cannot stand it anymore. But even though you pay they don't stop asking you to pay more. Almost everything you do you have to watch an ad or they will offer you a whatever package. Just make the game P2P and stop asking money every time you go to another screen then.