.      .
 .      K .      C A
     H      P    . .
     .  R   K  C    
     P      C  R   H
   A .  E . .      P
   E O  P K        R
   .    A          O
 K H             E  

Code-Doku Joke

What do you call a pig that does karate?

Place each of the letters of ROCK HEAP exactly once in each row, column and 3×3 box. In addition to the letters, each row, column and 3×3 box will also contain one empty square. 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: Easy

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