I gave the first model to my then 6 year old son. He had it done in less than 7 minutes.<br />
I was not at all surprised that he was offered a full ride to MIT when he was only 16.<br />
Me, I've never managed it at all.
Yes, and there are no "levels" once you know how to solve it the combination patterns make no difference whatsoever to the solution. I can do a cube in under 2 minutes usually, not sure if that's good or not, world record is 6 seconds or so??