You know those puzzles, usually about 4" x 4" square, somewhere in that vicinity that have a bunch of tiny square pieces maybe a half inch on edge and there's one missing and you slide them around until you were able to get the puzzle put together?

I had seen those for years but never spent much time with them. In the late 90s I used to go to a Whole Foods store after work to get a shot of wheat grass. It was hip and groovy for health back then, I think it probably does some good, but it was overrated.

Anyway, they had one of those sitting on the counter for several weeks. It was always there. So I worked on it and finally figured out the algorithm so to speak for solving it you would use a bundle of six squares, including the opening, and you could manipulate them to get it where you wanted. Would just go through the whole board that way. I have a feeling that learning how to solve a Rubiks cube would do some tiny amount of benefit to your mind.

I just did a search, all sorts of instructions quickly available.

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1986 300SDL, 362K
1984 300D, 138K