It would be a learning tool. Say you get stumped on a really hard puzzle and you only want it to give you a hint .. .or maybe just find one square. My intention is to make it so that it will solve one square and then give a verbose explanation of how it found that square. Or it might see that a square can be found and highlight it so that the users can look there to find a number as a hint. It uses many of the common methods for solving sudoku already.
Anyway, it’s a long way from that, but I’m applying for some jobs so I needed to have something to show possible employers.