Very disappointed in the sticker feature because I have not completed the entire collection when I made purchases, no purchases, and or committed the time and money to have all the stickers but 2 or 3. They don't get rotated enough either. Then when you're able to exchange the stickers for ones you don't have they don't allow you to repeat like once you exchanged 250 you have to advance to 500 then 800 that's to much and sometimes not enough time like unrealistic for an average player and difficult for an intermediate player as well.