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SUBMIT YOUR IDEAI just tried to post but I seem to have lost it -
Anyway here's my solution to the advanced section. I didn't include the other bits as they are needed to do the advanced.
Advanced done, write a little iterative macro to fill the blanks.
it's hard to find the general solving rules for all the sudoku, but it's definitely an interesting topic, will dig deeper later
I'll have to come back around for the intermediate and advanced.
Beginner and Intermediate Solution attached below
To understand recursion...
First you must understand recursion.
Went with a python solution as that seemed to be the most direct approach to crack the advanced part of this challenge