Hans Anderson, a hacker from Sweden has created a robot based on a Lego Mindstorms NXT Kit to solve the puzzling game, Sudoku.

The robot with the help of an optical scanner and character recognition software first scans the puzzle and feeds them into an on-board computer, which then does the math work to get the right puzzle. Once the puzzle is solved, the robot fills the blank spaces with actual numbers.

Andersson tells Cnet.com that solving the missing numbers is easy with a backtracking algorithm. But he added that the built-in Mindstorms processer is very slow and doesn't allow recursive functions, so he had to tinker its program. Despite Andersson calling it as slow, the robot still solves the puzzle faster than many of us.

To know more about how Andersson created this Lego robot to solve the Sudoku puzzle, click here.

Previously he created Lego Mindstorms NXT Kit to solve Rubik game and now this.

Hats off to Anderson for creating a neat robot, which we can use (if he produces it commercially) to solve some of the tough Sudoku puzzles.