The #1 has a unique level 19-11-4-2 solution and relatively small numbers of 84 assemblies. Juno believes that the puzzle has no possible rotational shortcuts although some pieces have room to rotate a little while assembling/disassembling. Of course, the puzzle is arduous, but some serious solvers will be able to assemble the puzzle not knowing the orientation of the pieces. Some of you might feel the similarity of the puzzle to his Grooved 6 Board Burr series when you play with it.
The puzzle is quite big, and it weighs 360g. It took about 3.5 hours just for CNC work to cut a set of 6 pieces. All the sharp corners are beveled.
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I accept Wise and Zelle.