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Code-Doku 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, Code-Doku puzzles use letters. Other letter-based puzzles such as Go Doku (or Godoku), Sudoku Word or Wordoku have a hidden word, often down the diagonal. Code-Doku 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 code-doku 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 print-friendly version of this puzzle and a solution. Other difficulties:
The puzzles below are the first jigsaw code-dokus. If you've been following the site, you might have noticed that I made a few non-standard 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 Code-Doku archive, including several “super code-doku” puzzles with overlapping grids. If you'd like to be notified when new puzzles are posted, just send me an e-mail at the address below. Good Luck!
Code-Doku 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 print-friendly version of this puzzle. Other difficulties:
Code-Doku 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 print-friendly version of this puzzle. Other difficulties:
Other Sudoku Puzzles and LinksCube Sudoku -- Sudoku puzzles using the six faces of a cube
Code-Doku Archive -- Previous puzzles from this site.
Code-Doku FAQ -- More information about Code-Doku puzzles and how to solve them.
Top Notch -- The only other source for Code-Doku 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