Edit:03/2022 For some reason after the recent update it crashes at any interaction you do regarding cards. When you pull, you crash. When you try to upgrade a card, you crash. You can still do the lessons, and access other things but it's annoying. Irrelevant mobile game- brings nothing new to the table, but I like the aesthetic and story. It's a cute, low effort/not grindy game (so far at least).