Made my way to second hospital, Oslo. It is so difficult to pass a level. Each upgrade costs a minimum 500 coins, but if you do not pass a level, you're only earning 3-15 coins. Even if you were to double your coins by watching ads, it will take weeks to get a upgrade, which doesn't really help you pass since each level is hard. This game has become a potential money pit, that I have uninstalled the game. NOT WORTH MY TIME AND MONEY!