Using a lot of information found in the help posts, I have created a nifty Sudoko solver that is quite compact, fast and solves (reportedly) the world's toughest Sudoku challenge!
The file is too large to add to this post, so send me a note (Radioflyer54) to get your open copy!
The file comes preloaded with the IA Escargot puzzle, according to sources on the internet to have been developed by a Finnish (uh - that would be Finnish and NOT fiendish) mathematician Arto Inkala, that took him three months to design (although personally I have browsed some 18 clue puzzles which I found to be much tougher!).
The code is well commented English so should be comprehensible for most readers.
I would greatly appreciate any feedback on the code - to make it more efficient, effective or whatever. Permission is granted to use the code anyway you want with the exception of for commercial purposes.