1. Apparently, if you're stuck, the background music will somehow give guidance. Loyal Blog Followers know that I always turn off all music and sound effects for all puzzle apps because they're often annoying and use up valuable battery life.
2. As I mentioned, all the levels are pretty much the same. I can't say: Level 83 was particularly ingenious. Nor can I say that I had an 'Aha' moment.
3. Still, I did spend the time to complete all the levels - on the same day no less. I did like it.