Sudoku saves photographers from copyright theft

A new watermarking technology based on a system akin to the permutation rules used to solve the numeral puzzles known as Sudoku has been developed by computer scientists in Malaysia. Writing in the International Journal of Grid and Utility Computing the team reports how their system could resist attempts to "crop" the watermark in more than nine times out of ten cases.

How hard can Sudoku get? Mathematician has the answer

An Irish mathematician has demonstrated that there's a minimum amount of help necessary for a Sudoku puzzle to be solvable.

Now your phone's better at Sudoku than you

Well, if you thought Sudoku was pointless before, now it really is. It's now possible for even the most innumerate player to solve any puzzle in seconds - simply by asking Google Goggles.