Addictive, that concludes all. They figured out how to make money more efficiently. It definitely has pay to win elements. The overall quality of the game screams that this game should be in paid category. They don't make this one paid to DRAIN your money indirectly. You may have that urge to pay stuffs here. There's one boss fight just before Shangham where you CAN'T win with given birds, if you ran out of diamonds, you're screwed. Diamonds are pricey. Uninstalled. Spent $0 but hours of ads.