crazy pay to win((( you cannot use earnrd in-game resources to success, because any update takes few days to wwit, and if you want to collect money, you definitely will bo robbed several times furing the awaiting time. So the only way to succed on levels 18+ is to buy coins and use instant upgrades, which are extremely expensive. This game will cost you more than some next-gen pc/console game, and also will waste so much of your time, untill you realize that you are broke.