Sudoku puzzles have only one rule, but they can be fiendishly difficult to solve. The rule is simply this:
Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9.
SadMan Software Sudoku is a fantastic tool to help you solve these puzzles. It can act as an assistant, removing the tedium and error-prone updating of candidate pencil marks, whilst leaving you the fun of spotting the logic and patterns. Or, it can solve the puzzle completely automatically and provides a log of the logic behind each and every number placement and candidate elimination. If you get stuck, it can provide you with a series of increasingly detailed hints to get you going again - this is great for learning the more advanced techniques.
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