Why solve puzzles by hand, when you can write software to solve them for you?
This is a quickly written automatic sudoku solver. It is slower than it could be, because your browser does the heavy lifting with a javascript, and that isn't very fast. Most puzzles solve in a few seconds, some trickier ones take up to 5 minutes to be solved. But best of all, you can do more useful things in the mean time!
"Turbo" mode will be faster in some browsers, but also might cause the script to time out.