The levels are fun, even after playing it for ages, I can still be surprised. Fun simple puzzles. HOWEVER, they have recently updated it so it plays a 30 second unskippable advert between almost each level, that's just ridiculous. At this point I genuinely spend more time watching inane brain numbing adverts than playing the game. It's now an advertising brochure with the occasional line game. Before the adverts - 4 stars, fun game to unwind to. With the adverts - 2 stars, almost unplayable.