It would probably be more enjoyable if the design was made in 3d geometry where both the existing work in progress and the individual pieces have more tactile uniqueness and a more congruent memory process. I imagine the mostly similar keys and various values would be tedious and frustrating without the additional visual cues. I am limited to around 6 memory fronts of focus at once where I can maintain my fastest focus and cognitive fluidity, at least this is the case with games like the open source Gauguin. I would likely find satisfaction in solving puzzles that constrained my solutions to a similar key/value dictionary. It might be an interesting thing to create in Open SCAD and parameterize.