Also, visit the Site I hav mentioned in the "Credits" section to understand the Algorithm used.

And visit the sites to know more bout the game/rules & if u want to try ur hand at Sudoku :
1. http://www.lovatts.com.au/sudoku/sudoku.htm
2. http://jayisgames.com/archives/2005/06/web_sudoku.php


Ciao,
Rajiv