Sudoku champions be proud. The sophisticated thinking used to solve the mathematical puzzles is beyond even the most advanced computers.
Professor John Hopfield of Princeton University has been studying how we solve Sudoku puzzles to understand the process known as associative memory - our ability to spot similarities and discover patterns from limited information.
Every time we put the right number in a Sudoku square it provides a clue, bringing us one step closer to recognising an overall pattern and solution.
"The measure humans use for similarity is very difficult to capture in computer programs," says Professor Hopfield. "Computers make no use of 'learning' from previous experience."
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