I've played many variations on the "Pipe Puzzle" over the years and this is my favorite yet in terms of game play. I don't use sound, I ignore the cartoon simplicity of the cut scenes, and haven't a clue how they do the scoring (not yet, anyway). I just take my time, relax, and use my brain to achieve the best solutions. It's such a smart puzzle I wish it were packaged as such. One is warned that time is running out, yet it never does, I never hurry, just move along at a nice pace and in time, perhaps, I'll figure out the mystery as to why I'm getting one star on almost every level YET I'm being awarded all sorts of trophies for using large amounts of piping, and am earning a ton of money for the upgrades in the game's store. I have to assume that the time, although no clock is present is what affects the score. I know I'll play it again, as there is never just one solution, so as I earn the gold coins, I am buying the 'slow downs' that on a second play through I can find out the scoring process. I've loved many a game with mysterious scoring behind the scenes, so who cares, this is a GREAT pipe puzzle! Having a ball, and if you agree with my review at all, you may too.