Dragon Burr Wooden Puzzle | Impossible Puzzle for Adults personalizable gifts There are 9 different types

There are 9 different types of fish among the 20

Note the video shows both models 74A and 74B

and the dad or grandpa who is famously hard to buy for

Material: Premium wood with laser engraving

calculated by the formula M = [n(n x n + 1)] / 2

Dragon Burr Wooden Puzzle | Impossible Puzzle for Adults personalizable gifts There are 9 different typesI believe this is one of our 4 most difficult puzzles. 18 pieces, ALL DIFFERENT!!, make up this 6x6x6 burr. Quality is exceptional with bevels on square corners to give it a softer look and feel. Since our release of this puzzle there have been no claimed solutions without the instruction sheet. Instructions are good if you need them:) Level of Difficulty: Level 5 Materials: Wood