Pen with a toy labyrinth incorporated therein

A pen comprising:

• a barrel having a coaxial internal cylinder to hold a refill for writing,
• said barrel having a series of chambers around a peripheral wall of said internal cylinder,
• said chambers defined by a series of circular flanges spaced in parallel and engaged along the length of said internal cylinder,
• each chamber of said chambers being divided into a number of small cells by division walls,
• at least one opening at a different location on each circular flange of said circular flanges for allowing said each chamber to communicate with adjacent chambers of said chambers,
• said small cells and each said at least one opening forming an intricate network of winding passages,
• a transparent sleeve engaged around an outer periphery of said circular flanges and
• a ball movably contained between said transparent sleeve and said internal cylinder to permit passage through said each said at least one opening from one cell of said small cells designated as a starting point to a last cell of said small cells as finishing point.