I also bought the premium version, prematurely. The logic is awful. Games of chance are better than games of garbage. This game manipulates the tiles as it chooses to play against you. It would be like playing blackjack and cheating by dealing bad cards once you make to a certain level. The mechanics are fun until you play enough to realize the lazy developers created horrific logic. You will notice if you play much and it soon become obvious.
Play long enough until you need a tile. Youll either be dealt endlessly 2s or 1s if you dont need them ... Or you will never get the horizontal slide slide if you do (you will get 5 vertical in a row). Im good enough with math to recognize patterns and its predictable enough to know when its going to happen. It happens every game at a certain level. Awful.