Kinda wish I could give this game no stars. Everything costs money in this game. You wanna make the game go faster so you get through waves? Pay me $10, wanna earn more money? Bust out the wallet. Are the achievements taking too long and feeling kinda repetitive? Buy some gems. I get you gotta get some money out of this "free" game but damn you guys really wanna leave my wallet dry. Now I don't have to buy it I could just play it from time to time, but why you gotta tempt me every two seconds?