R    E        L
 M                 I
 W                 V
   E      M      S  
        E S    I    
 L      I      M    
        V        R S
     W    I         
 V      A   L       

Code-Doku Joke

If a long dress is evening wear, what is a suit of armor?

Place each of the letters of EVIL SWARM 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