It was exactly the game I was looking for in pushing my boundries. I probably did 85% of these on my own, occationally needing a nudge to get the logic they were going for. It loses a star because of some of the unnessary punishments they add. A good example is a puzzle involving an elevator. It's made hard enough going up, but make an error, and it sends you back to the bottom...soooo slowly. There's enough trial and thought to almost all the puzzles that adding a 2min reset to getting it wrong is just punative.
