How about a nice little robot build using the LEGO Mindstorms kit that can autonomously solve a Sudoku puzzle? Hans Andersson who lives in Sweden constructed such a robot in his spare time using a robotics kit that he initially purchased for his two kids.
The result is fascinating. Hans used a light sensor to read the puzzle using some clever image processing techniques. He wrote an optimized algorithm for solving the Sudoku puzzle and he, lastly, equipped the robot with a pencil to fill in the numbers.
Very nice work. Enjoy the video below that shows the robot perform its task.
PS: Keep an eye on Hans' website because he will eventually post instructions on how to build your own Sudoku solver robot.
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