SadMan Software: Sudoku 

SadMan Software: Sudoku is a program that will solve any Sudoku puzzle.

This program is intended to give you the right numbers that you must place into each box. You can enter a sudoku puzzle, and order the program to solve it. Doing this, you will spoil the fun of playing the game, but that will be very useful if your work is to create sudoku puzzles, or you was not able to complete certain game. There is other way in which the program will assist you in the resolution of puzzles: it will show you which numbers are candidates to occupy a box. By pointing the mouse arrow on those boxes, you will see a wheel of numbers, where the candidates are marked in bold. You can then click on the candidate you like. If it is not the right one, the program will slash it, so you can correct your input.

This program can give you hints to let you guess the right numbers to put in the boxes. It is also able to apply different solving techniques, and teach you how to use them. You can use any level of help. By clicking on the numbers at the bottom of the screen, you will tell the program to highlight those numbers on the board.