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Conceptis Sudoku
Sudoku are easy to learn yet highly addictive language-independent logic ...
Sudoku is a number placing puzzle based on a 9x9 grid with several given ...
http://www.conceptispuzzles.com/products/sudoku/ - cached

A Few Words About Sudoku, Which Has None - New York Times
As humans we seem to have an innate desire to fill up empty spaces. This
might
explain part of the appeal of sudoku, the new international craze.
http://www.nytimes.com/2005/08/28/weekinreview/28shor.html