Sam Ruby just had a “post”:http://www.intertwingly.net/blog/2005/09/25/Do-you-Sudoku about “Web Sudoku”:http://www.websudoku.com/ a nifty sort of number crossword game that seems to be quite popular these days.

After just a brief exposure it's already clear to me that Sodoku (and the web version in particular) is incredibly addictive.  I spent a good portion of my lunch break playing and trying to improve my solving speed.  I'm getting a better feel for it, but I'm sadly still far below average.

Wikipedia has a nice "article on Sudoku":http://en.wikipedia.org/wiki/Sudoku with plenty of background and further information.

*Update:* It's pretty sad that I mispelled sudoku as "soduku" and just realized it.  Oops.