TwistyPuzzleLib

  public int getYearOfInvention() { return 2018; }

  public float getDifficulty()    { return 3.51f; }

  public String getObjectName()   { return "Penrose 4x4"; }

  public int getCategory()        { return CATEGORY_SHAPE_HEX | CATEGORY_AXIS_FACE; }

  }