You probably have to lose the game. You will need to factory reset the PB, in order to clear out your BBID from app world so the person can set up their own account and buy their own apps. Otherwise they will be able to buy apps and they will get charged to you. Or THEY will lose the app when they factory reset because they don't know your app world password. It's unlikely the app will have any value to them unless they plan to NEVER buy apps.
