If you're looking to learn how to play Sudoku, the scanning technique is a swift and generally efficient method of solving ...

But even the most dedicated Sudoku-solver ... who is struggling to solve some puzzles. 'These equivalent sets can be very ...

But even the most dedicated Sudoku-solver ... who is struggling to solve some puzzles. 'These equivalent sets can be very useful for hard Sudokus where all the usual methods aren't getting ...