http://blogs.msdn.com/b/jmstall/archive/2006/01/22/sudoku.aspxLet me make an analogy between debugging a program and solving a Sudoku. Sudoku is a number-crossword type of game where you fill in numbers in a 9x9 grid such that each row, column, and 3x3 box contain each of the numbers 1...9. The grid is pre-initializeden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/jmstall/archive/2006/01/22/sudoku.aspx#566534Sat, 01 Apr 2006 18:04:19 GMT91d46819-8472-40ad-a661-2c78acb4018c:566534Stephen Toub - MSFTThis one is open source... <a rel="nofollow" target="_new" href="http://msdn.microsoft.com/library/en-us/dntablet/html/tbconSudokuSampleFinal.asp">http://msdn.microsoft.com/library/en-us/dntablet/html/tbconSudokuSampleFinal.asp</a><div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=566534" width="1" height="1">http://blogs.msdn.com/b/jmstall/archive/2006/01/22/sudoku.aspx#523697Fri, 03 Feb 2006 04:18:39 GMT91d46819-8472-40ad-a661-2c78acb4018c:523697Mikehrm... too bad it's not open source, i would like to build off of that for my puzzle generator... it would help my program to better understand complexity for humans and thus allow me to fine tune my puzzles for difficulty.<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=523697" width="1" height="1">http://blogs.msdn.com/b/jmstall/archive/2006/01/22/sudoku.aspx#517116Wed, 25 Jan 2006 01:40:50 GMT91d46819-8472-40ad-a661-2c78acb4018c:517116Rolf HuismanThis kind of behavior for a debugger is more in line with a validator. Validators like state explorers give a complete deduction wy something happens that way.<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=517116" width="1" height="1">http://blogs.msdn.com/b/jmstall/archive/2006/01/22/sudoku.aspx#515942Sun, 22 Jan 2006 19:57:18 GMT91d46819-8472-40ad-a661-2c78acb4018c:515942Blake HandlerYour company even has an Excel Sudoku &quot;solution&quot; (^_^) <br> <br><a rel="nofollow" target="_new" href="http://office.microsoft.com/en-us/templates/TC100809721033.aspx">http://office.microsoft.com/en-us/templates/TC100809721033.aspx</a><div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=515942" width="1" height="1">