I was in a section of YouTube with videos of watch innards -- yes, my Friday nights are that exciting -- when I saw the above video for something called a Superplexus. I had no idea what it was about, and was baffled by it all until I realized that it was a large 3-D maze. The sphere is mounted on gimbals and you spin it around guiding the ball from start of the maze to its finish. It supposedly takes a proficient player about an hour to complete the maze.
The Superplexus in the video above is a custom work that was commissioned. It turns out that it is an outgrowth of Perplexus, which is a plastic, hand held toy version of the same 3-D maze concept. I think I may have seen them before, but didn't look at them too closely at the time. They look pretty entertaining in a maddening sort of a way.