Fun, but I did have some navigational issues. In a few scattered levels I couldn't re-enter puzzle opened doors, had to rely on the hints to move me past them. Also, frequently had to pay for two hints just to get the one I needed. The first one shows you where to use what you get from solving the puzzle the next hint is for. That is backward and wasteful of our coins. Still, overall it kept me busy and entertained, so I guess it did it's job.