**** Happy Cube Expert 9 – 99 years
This is the most difficult version of the Happy Puzzle Family. You can recognize the Happy Cube Expert (Marble Cube) puzzles on the marbled EVA foam.
Each of the six Happy Cube Expert puzzles has a different shape, colour, and solution. Every model has it’s own name which refers to a remarkable citizen of the world. For example the blue foam puzzle refers to the civil rights-worker Martin Luther King.