
CodeDoku puzzles blend the logical challenge of normal sudoku puzzles with a surprise message that is revealed as you work toward a solution. Instead of using the digits one through nine, CodeDoku puzzles use letters. Other letterbased puzzles such as Go Doku (or Godoku), Sudoku Word or Wordoku have a hidden word, often down the diagonal. CodeDoku puzzles have shaded squares that contain the hidden message. When you have determined the solution to the puzzle, the letters in the shaded squares will spell out the hidden message. This puzzle was suggested by Arnie Miller in San Mateo, California. This is also the first symmetric codedoku that I've posted.
A Special Treatby Steve Schaefer
Place each of the letters of BE SPINACH exactly once in each row, column and 3×3 box. When you have completed the puzzle, the shaded squares can be read left to right, then top to bottom to form a phrase describing a special treat. Anagram: BE SPINACH Difficulty: Easy Here is a printfriendly version of this puzzle and a solution. Other difficulties:
The puzzles below are the first jigsaw codedokus. If you've been following the site, you might have noticed that I made a few nonstandard puzzles when I did the holiday greeting puzzles. The 5×5 puzzle below, is a good introduction to jigsaw puzzles. The 11×11 is harder than the 9×9 puzzles. Here are a couple of things to know about jigsaws if you're going to go beyond the easy and moderate puzzles:
You might want to consult the FAQ. There are additional puzzles in the CodeDoku archive, including several “super codedoku” puzzles with overlapping grids. If you'd like to be notified when new puzzles are posted, just send me an email at the address below. Good Luck!
CodeDoku Joke #20How does a pig get to the hospital? Place each of the letters of CAMEL IN HUB exactly once in each row, column and box. In addition to the letters, each row, column and 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 (Caution: This is an easy 11×11 jigsaw. It is harder than a moderate 9×9.) Here is a printfriendly version of this puzzle. Other difficulties:
CodeDoku Joke #19What clothes does a house wear? Place each of the letters of READS exactly once in each row, column and 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: Easy Here is a printfriendly version of this puzzle. Other difficulties:
Other Sudoku Puzzles and LinksCube Sudoku  Sudoku puzzles using the six faces of a cube
CodeDoku Archive  Previous puzzles from this site.
CodeDoku FAQ  More information about CodeDoku puzzles and how to solve them.
Top Notch  The only other source for CodeDoku puzzles.
Top 50 Sudoku Sites  A collection of links to sudoku
puzzles, solvers, games and more.
Beginner's Introduction to Sudoku  This is all you need for
the easy and moderate puzzles when I give a full set of difficulty levels for a codedoku.
Techniques for Solving Sudoku  This site presents more advanced techniques for solving tricky, fiendish and extreme puzzles.

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Thanks,
Steve