Fit all the pieces into the box.
This is one of the most difficult packing problems that you’ll find. This crafted wooden brain teaser cube contains 25 identical Y shaped pieces. The objective is to take the elements out of the box and then build a perfect cube, using all of the pieces. You can also try building other rectangle shapes by using part of the pieces. It comes with a nice looking base and a lid for keeping all the pieces together. Considered to be a very challenging puzzle.