I really like this game but the coin system is extremely flawed. You can not move on till you find every difference and sometimes you will look till your eyes bleed and still can not find it. Then you finally breakdown and buy coins(because your daily bonus of 2 doesn't get anything) and what they show doesn't look different at all. If you loose you are unable to play for 15 min or pay 30 coins. Once you get to a certain level they want 30 coins to show a difference.