This interlocking 3D puzzle cube has only four pieces yet, with one solution, it will take a significant amount of effort to solve the puzzle. All you need to do is pull out the right piece and it comes apart. Finding the right piece to pull is the challenge. It is even more of a challenge to put it back together. Each piece must fit together intertwined with the others if it is to form a cube once again. This puzzle makes a great party game. See who can solve the puzzle the quickest. These puzzles are handmade from various hard woods such as Oak, Maple and/or Poplar.