News - ABC News

A Finnish mathematician claims to have designed the world’s most difficult Sudoku. The numerical puzzle took Arto Inkala three months to design, and it has only one solution — one that only the sharpest minds will discover, he told the Daily Telegraph. A daily fixture...

Read more: http://feeds.abcnews.com/click.phdo?i=adf022f7111ecc8e7b399386a67fbfa1

< Prev		Next >