Create an augmented reality application which provides directions to solve a Rubik's cube, watching your moves as you do them and providing a way to recover if you make a mistake. (Often, if you make a mistake in the middle of an unassisted solve, it's as bad as needing to start all over again.) This would be most useful for puzzles much larger than the Rubik's cube where a single mistake might undo hours of work.
It could also provide a way to quickly get back to a specific starting position (scramble) that you want to repeatedly solve, perhaps for practice or to investigate different ways of solving. The backend could use Kociemba to find short sequences. Having a way to easily get to certain positions vastly lowers the barrier to entry in learning to solve puzzles. This was the motivation for the Lego Rubik's cube.
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