on a similar note, you can get yourself a 4D rubiks cube (projected into 3D)
It is not a 3x3x3x3 but 2x2x2x2.
It looks like Melinda (the inventor) have made them easier to obtain. back when I got one, 3D printed parts, magnets, and coating all came from different sources, but absolutely worth it, they are very unique and work well.