Every time I would get even close to earning a gift card the number of units to buy it would go up when I first started playing a 5$ Google play card was 1,500 units so I got the 1,500 units and when I went to buy it it said it was 1,800 units and it's so slow to earn units the game said hyper on it and after gave me only about 200 units after an hour of playing and if I do get a gift card it takes forever for me to even get it