I recently made a very interesting variant of Fenz 3*3*3 cube - Joint Cube: http://bbs.mf8-china.com/forum.p ... &extra=page%3D1
During the discussion with Oscar and Carl, the idea was born of how to make this puzzle more visual.
The idea of the puzzle is very simple: you can twist the puzzle as well as the usual 3 * 3, but the black cubes will always be connected in one chain.
as well as in Joint Cube I made three versions with different number of connected lines. but it is possible to make even more options.
(I started this modification because on the basis of this I came up with a few more puzzles, I will show them later)