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Thursday, January 22, 2009 – Permalink –

## CrossNumber puzzles

I have to admit that I have not caught the fever that these puzzles seem to have generated.

Most every newspaper in the world has started publishing these brain teasers.

"Sudoku , sometimes spelled Su Doku, is a logic based placement puzzle, also known as Number Place in the United States. The aim of the canonical puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9x9 grid made up of 3x3 subgrids (called "regions"), starting with various digits given in some cells (the "givens"). Each row, column, and region must contain only one instance of each numeral.
Completing the puzzle requires patience and logical ability. Its grid layout is reminiscent of other newspaper puzzles like crosswords and chess problems.
Although first published in 1979, Sudoku initially became popular in Japan in 1986 and attained international popularity in 2005."

Wikipedia — Sudoku

Here is a download that will construct as many of these puzzles as you might be Jonesing for.

Andy Pope Su Doku

Also:

Su Doku.com

Web Su Doku

Here's an Excel template from the Redmond people:
1. Enter puzzle values in Starting position grid
2. Set Game state to 1
3. Press F9 to calculate
4. The Possible numbers grid will show the first step in the solution
5. The Final position will show the current result
6. Continue to repeat calculation by pressing F9 until the puzzle is solved or the solver stops responding
Sudoku solver

[Edited entry from 11/18/2005]

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<Doug Klippert@ 3:32 AM