The Short Version:
This set of well-annotated example scripts shows how to solve sudoku puzzles with simple, powerful bitmask functions applied on a massive scale, demonstrating both common solving techniques and highly-optimised brute-force.
All you need is:
to like sudoku's
basic logic
primary school maths
to download & install this bundle (v1.2; 25 July 2020) and this #include file (v5.1+)
the CrossFilter GUI