For the 3D SQUARE CUBE puzzle and more info please visit: https://kubiyagames.com/collections/geometric-objects/products/altekruse-puzzle-3d-wooden-brain-teaser-puzzle This 12-piece "3D Square Cube" puzzle has an asymmetrical shape of an abstract cube. The secret to this puzzle is finding the single key piece which needs to be removed first in order to release the puzzle. This key piece must be also the last piece to go into the puzzle structure in order to lock the other pieces in place. Music - Sonata No. 3 in A Major for Cello and Piano, Op. 69_ II. Scherzo_ Allegro Molto