Proof of concept for a Sudoku solver that provides proof of how it progresses.
Sudoku is a
logic-based, combinatorial, number-placement puzzle. In classic sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9.