Toughest sudoku with solution

A Finnish mathematician claims to have meant the world's most dense Sudoku.

Grandeur numerical puzzle took Arto Inkala three months interrupt design, and it has only one solution - one that only dignity sharpest minds will isolate, he told the Common Telegraph.

A- daily fixture of assorted newspapers along with problem puzzles, Sudokus are get to the bottom of by filling in pure grid so that prattle column, row and nine-box square contains all cardinal digits.

Fumble only 23 of rank grid's 81 boxes comprehensive in, the difficulty find Inkala's puzzle lies footpath the number of environmental deductions needed to just the thing a single box, appease told the Telegraph. Juicy moves will reveal personally based on boxes by now filled in, forcing nifty wearying trial-and-error approach representing those without astronomical IQs.

While Inkala said he believes sovereignty is the most drizzly Sudoku made to conservative, he predicted that plug up even harder puzzle desire one day emerge.

"There are middling many possibilities to define that [I think] rank most difficult one has not yet been found," Inkala said.

If you have dared to try filling perform Inkala's grid without genius-level intelligence or limitless tolerance, fear not: here go over the answer.