Could this be the toughest sudoku puzzle ever devised?
Number cruncher Dr Arto Inkala has created this new challenge to rival the AI Escargot grid – widely regarded as the most difficult yet.
Applied mathematician Dr Inkala, 41, from Finland, said: “I believe it is the most difficult puzzle I’ve ever created.
"It will test your brain power to the maximum and, I hope, rival AI Escargot. Good luck."
Here is the link for those who would like to try it ! .. Good luck!!