I      T C
     L  R        U  
 I R                
     C      A      K
 A L    M   U  T    
                    
 M U                
   T        L  C   A
                 M  

Code-Doku Joke

What has one horn and gives milk?

Place each of the letters of TRIAL MUCK exactly once in each row, column and 3×3 box. When you have completed the puzzle, the shaded squares will form the punch line of the joke read left to right, then top to bottom.

Difficulty: Extreme

Here is a print-friendly version of this puzzle.

 

Please send responses to my email address is mathrec at this domain

Thanks,
Steve