me just tried 2 or 3 times after that got bored of same stuff ..... the interesting thing i want to tell is one of mine fren has developed a program to solve that in C that is really koool .....
Its simple... go to http://www.sudoku.com/ and read the rules... Basically there whould be a number which should repeat in the same coloum and the row(s)... And whensoevr you mark a number there should be a good reasone for it...
Another small sudoko program ,you will need the .net runtime files for running this application .check it out at Gaurav Khanna's (Microsoft Developer Evangelist) site at http://www.wintoolzone.com/showpage.aspx?url=dotnet.aspx