If you have dared to try filling in Inkala's grid without genius-level intelligence or limitless patience, fear not: here is the answer. "There are so many possibilities to formulate that the most difficult one has not yet been found," Inkala said. ![]() While Inkala said he believes his is the most difficult Sudoku made to date, he predicted that an even harder puzzle will one day emerge. Few moves will reveal themselves based on boxes already filled in, forcing a wearying trial-and-error approach for those without astronomical IQs. With only 23 of the grid's 81 boxes filled in, the difficulty of Inkala's puzzle lies in the number of logical deductions needed to fill a single box, he told the Telegraph. 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.Ī daily fixture of many newspapers along with crossword puzzles, Sudokus are solved by filling in a grid so that each column, row and nine-box square contains all nine digits. The same goes for 4 as a sum of 3+1 (2+2 breaks the rule of not repeating the. If you have a cage with the value of 3, you know for sure that it’s only 1 and 2 that can be inside. No need for a crystal ball here, it’s not as hard as it seems. ![]() (Pekka Carvonen)Ī Finnish mathematician claims to have designed the world's most difficult Sudoku. A useful technique to master hard killer Sudoku levels is trying to predict the numbers in a cage. ![]() Arto Inkala, a Finnish mathematician, designed this Sudoku puzzle, which he claims is the hardest Sudoku yet.
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