Finnish Mathematician Dr Arto Inkala, of Helsinki University, yesterday claimed to have created the world’s toughest Sudoku, after spending three months devising it. Unfortunately for Dr Inkala, within hours of it being published, it was easily solved, and the solution reproduced on various websites.

Did you complete it? Why not try Mensa brainteasers here. 

There are numerous suggested origins of Sudoku, but its current form became popular and regularly published in Japan in the mid-1980s. Over the past decade Sudoku brainteasers have become a puzzle phenomenon in the UK.

Mensans in the West Midlands region are treated to a special edition of Sudoku in their monthly regional newsletter, Spaghetti. Spaghdoku uses letters as a substitute for numbers, and this example below is the creation of Mensan Ron Parker. See if you can solve the puzzle. 

 

If you enjoy Sudoku why not try the Mensa electronic hand-held Sudoku with over 1 million puzzles to solve – for more information visit the Mensa Shop.   

Spaghdoku Answer 

More information on Dr Inkala's Sudoku is available here.