This Sudoku solver has been written just for fun by a Python noob. It can solve the hardest Sudokus in less than half a second (for example, it solves the AI top 10 in 1.3s.)
PS: The puzzle may be 2x2, 4x4, 9x9, 16x16, 25x25, ..., n^2xn^2
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To enter the Sudoku from a console:
$ python sudoku.py
# It will ask you to enter the Sudoku.To load the Sudoku from a file:
$ python sudoku.py filename.txt
# An example of a file:
# filename.txt
# 8 0 0 0 0 0 0 0 0
# 0 0 3 6 0 0 0 0 0
# 0 7 0 0 9 0 2 0 0
# 0 5 0 0 0 7 0 0 0
# 0 0 0 0 4 5 7 0 0
# 0 0 0 1 0 0 0 3 0
# 0 0 1 0 0 0 0 6 8
# 0 0 8 5 0 0 0 1 0
# 0 9 0 0 0 0 4 0 0