You downloaded a game to your phone a few months ago. Your friends all played with you at first, but eventually they got bored and deleted the app. You play all day. The app is free to download, but at this point you have spent hundreds of dollars for upgrades and bonus items. That was all of your savings and birthday money, plus you told your parents that you needed money for a nonexistent school trip. You cannot fall asleep at night without playing a few hours and you now have trouble paying attention in class because you are thinking about the game. what is this mental illness called