Don't start playing it. It's quite funny in the beginning and if you constantly paying real money for boosters. But once you stop wasting money the game let you die hard. Most "simple" levels fail on the first try and you lose all boosters and without them: Level 2699 (simple) took me almost 50 tries and level 3207 (super hard) needed 88 attempts!!! It's not funny anymore to play day by day to pass a single level, be demoted to the lower leagues and miss all events. So frustrating...