I keep completing the tasks to earn the ZEM (gems) and I haven't received ANYTHING for it. I completely various surveys just to not get anything. It's not fair! It's super cute but it takes ages to load. Also, there is virtually no way to earn Zems (except for the "lucky" option where you can win like 1-2 max, and buying it of course). I wish there was a game to help earn those since so many items in game cost zems