You can solve it via brute force if you cut off branches that don't satisfy the rules: https://github.com/tonyedgecombe/Sudoku/blob/master/Sudoku/Program.cs ht

You can solve it via brute force if you cut off branches that don't satisfy the rules: https://github.com/tonyedgecombe/Sudoku/blob/master/Sudoku/Program.cs https://github.com/tonyedgecombe/Sudoku/blob/master/Sudoku/P... It's not 1ms but it's not that slow either.