Give one star because of the 1st lavel ... In the 1st level we upgrade mills and tree cutters trainers trucks etc and we get more coins when we upgrading the factories ...Firstly we get ovarall 10,50,100 coins but after upgrading many things we get more and more coins in less times,,,, we get million coins after playing about an hour but after we bought a new factory or area,Boom!!! Everything resets .... And thats the main boaring part..After reached the peak it resets...Thats the main problem.