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

SadMan's software Sudoku game makes Sudoku more enjoyable and I recommend it to all my friends. The ability to print a puzzle enlarged for easy use, with or without candidates, is one of many ways SadMan enhances the experience of working a Sudoku puzzle. The software provides a number of options including help understanding the techniques required to solve a puzzle, asking for specific help when you get stumped, or for a harder experience allowing wrong number choices which could dig a big hole the user may never recover from. Thanks SadMan for helping us play and learn Sudoku.
Dean Schwickerath, Washington
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