WARNING: THIS APP WILL LOCK YOU OUT AND YOU WILL LOSE ALL YOUR PROGRESS! Including all the things you spend real $$$ on in game! I loved this game until I switched devices and when I went to sign in every single code they sent came up as "invalid code" when I tried them. I lost years of progress as well as the financial waste. It was worth it when I could still log in. So, if you don't want to link this game to your fb account I would NOT RECOMMEND IT!!! I am so disappointed.