Kindve fun but ultimately a huge RIP OFF .Nowonly giving one Star and believe me if give less if I could. After realizing I'd have to spend over 8,000 a-coins( special in game currency that you either have to pay real money for or be given two or three from a chest of your lucky enough) just to upgrade my mechanic the next rank...yeah no. Only chance to advance is if you spend real money other wise you will be needlessly grinding especiy when rare mech you unlock cost 8,000 a-coins.