This is a Sudoku Solver I wrote, using Python.
It implements a backtracking algorithm, which you can consider to be a 'refined' way of brute-forcing. It emulates how a human might decide to solve it, but in much quicker time.
The sudokus are stored in
.sudoku files (plaintext), stored as a 9x9 grid of numbers (9 lines of 9 characters).
The speed of the visualisation can be adjusted by changing the value of the
SPEED variable. For the example above, a value of 100 was used: 100 milliseconds between each action.