Very good game and I like it but they push you to buy energy or cards just to continue and win. To complete task you have to play with 3 or 4 computers at the same time and they can bit you before you play even one card. Also you have to win the whole 4 computer plays 5 or 6 times simultaneously to reach only one level which is very hard unless you buy cards of course. From my point of you that is not fair game, they can make it with paid only so people will know from the beginning.