What are .SDK files?

.SDK files are saved Sudoku puzzles in SadMan Sudoku format. They can be created and opened by SadMan Sudoku and also some other Sudoku applications.

The files are in a simple text file format, which means that if you simply want to see the puzzle, you can even open them using Windows Notepad.

The file may simply consist of 81 characters in a 9 x 9 array, or there may be up to five sections of data giving header information, the initial puzzle, the current state of a partially solved puzzle, any pencil marks, and any cell colours.

The various header fields are identified by a # followed by a single character:

  • #A - Author
  • #C - Comment
  • #D - Description
  • #B - Date
  • #S - Source
  • #U - URL
  • #L - Level or Grade
  • #N - Number of solutions
  • #H - Number of clues
  • #T - The time taken to reach the current state, in seconds

Format example 1, minimal puzzle

      6.......7
      ....9..2.
      3.1..259.
      8....7.13
      ....8....
      76.3....8
      .782..1.6
      .5..3....
      2.......9
      

Format example 2, everything:

      #A SadMan Software
      #D Straightforward enough
      #C watch for the naked pair
      #B 27/08/2009
      #S SadMan Software Sudoku
      #L Mild
      #U http://www.sadmansoftware.com/sudoku/
      #N 1
      #H 27
      [Puzzle]
      6.......7
      ....9..2.
      3.1..259.
      8....7.13
      ....8....
      76.3....8
      .782..1.6
      .5..3....
      2.......9
      [State]
      6.....387
      547893621
      381..2594
      8....7.13
      ....8.765
      76.3...48
      .782..136
      .5..3..72
      2......59
      [PencilMarks]
      ,29,29,145,145,145,,,
      ,,,,,,,,
      ,,,67,67,,,,
      ,29,2459,4569,2456,,29,,
      149,1239,2349,149,,149,29,,
      ,,259,,125,159,29,,
      49,,,,45,459,,,
      149,,469,1469,,14689,48,,
      ,13,346,1467,1467,1468,48,,
      [Colours]
      .........
      .........
      .........
      .2111.2..
      .........
      .........
      .........
      .........
      .........
      

Corresponds to: fileformatexample.sdk

Sudoku format example

What People Say

After only one day of free trial, I knew your program was for me and I bought it. It's a superb program! Not only is it mighty when it solves puzzles, it has beautiful human interface quality. I really like it, find I can use it experimentally at several levels, and it is now helping me to understand some solution philosophies better. Great stuff, very reasonably priced, excellent! Thank you, keep up your fine work. PS - Just for a grin, I took a screen shot of one of the fiendish samples from a downloaded PDF from your site. I cropped it into a JPG, and simply dropped it on the Sudoku icon. Wow, it magically just did the character recognition bit, and there was my puzzle! Awesome.
Larry Cunningham, New Mexico
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