It was almost fun while it lasted. I got tired of watching ad after ad after ad just to multiply my earnings, save up gold just to FINALLY get a machine gun only to suddenly be forced to watch more friggin ads! Oh, and once I saved up enough gold and got a machine gun, it sucked even after upgrading it. The last straw was a really cheap death at the hands of a giant zombie that just appeared to my left. I gave it two stars only because it was fun, but clearly intended to be pay-to-win.