Fun & Challenging game. Really gets your mind working....IF you're not busy watching one of ENDLESS ADS! I'm uninstalling this game, as I'm looking to play games....NOT watch ADS. This is just ridiculous! And sure, you can PAY for no ADS, but that's what they want...to separate you from your money. It's all done on purpose, and I ain't falling for it! Besides...they want a very unreasonable amount for no Ads. NO NO NO!