This is a really fun game and well designed. But it is IMPOSSIBLE to continue without paying real money to buy energies! I have paid twice first 3 days of playing and everytime 1000 to 2000 plus energy. But it only can last maybe 3 days only doing basic stuff no need to mention those island challenges. Those island challenges are really nicely designed and looked interesting. But I can barely finish 1/6 because of not enough energies. I can see that I am very close to uninstall this game!