This game should be called adsdom. Literally ads after every puzzle that takes no longer than 10 seconds to solve. So 10 second puzzle, 30 seconds of ads. Painful to play, quit after the 5th stage. If they made it every 5 or so, or to get coins. Acceptable. But after every stage there is an ad, and if you want coins (which most brain games give you for solving a puzzle), you need to watch another 30 second ad.