
This site contains three different sudoku variants: CodeDoku and Cube Sudoku, and a new set of variants featured on the home page and posted daily on Sudoku of the Day. 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. Cube Sudoku puzzles are formed on the six faces of a cube. Each face has a 4×4 grid. The sixteen values must be placed so that each value appears exactly once on each face. In addition, the rows and columns on each face extend all the way around the cube. Each of the sixteen values must also be placed so that each value appears exactly once in each of the twelve strips. The Sudoku of the Day page features sudoku puzzles in a variety of novel configurations. Like Cube Sudoku, the rows and columns of these puzzles may curve, so that the same strip may pass through one box as a row, but pass through another box as a column. If you'd like to be notified when new puzzles are posted, just send me an email at the address below. For more information about these puzzles, please check out the CodeDoku and Cube Sudoku pages. Good Luck! Current CodeDoku PuzzleThis puzzle was suggested by Arnie Miller in San Mateo, California.
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:
Cube SudokuThe image below is the current "Easy" Cube Sudoku puzzle. You can get a larger version of this puzzle, the solution, and more difficult puzzles at the main Cube Sudoku page. Difficulty: Easy
Other Sudoku Puzzles and LinksSudoku of the Day  Daily puzzles, mostly with 3x3 boxes connected by curving row/columns.
CodeDoku  The main page for codedoku puzzles (with previous puzzles).
Cube Sudoku  The main page for cube sudoku puzzles.
CodeDoku Archive  Previous codedoku 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.
Sudoku Solving Techniques  This site presents more advanced techniques for solving tricky, fiendish and extreme puzzles.
Sudoku Methods  My own description of sudoku methods. It's not as polished, but it includes
some methods that do not apply to the classic 3×3 grid of 3×3 boxes.

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Thanks,
Steve