iheartchaos:

Evening brainteaser: Have a shot at the world’s hardest sudoku puzzle
Finnish mathematician Arto Inkala challenges you to a game of sudoku, the hardest one ever constructed. 
Give up? Here’s the answer.
Via

iheartchaos:

Evening brainteaser: Have a shot at the world’s hardest sudoku puzzle

Finnish mathematician Arto Inkala challenges you to a game of sudoku, the hardest one ever constructed. 

Give up? Here’s the answer.

Via