The World Toughest Sodoku

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I believe many of you know what is Sodoku, it is so popular today. Sodoku is a logic-based number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution.he puzzle was popularized in 1986 by the Japanese puzzle company Nikoli, under the name Sudoku, meaning single number. It became an international hit in 2005. It is believe that this games, the modern Sudoku was most likely designed anonymously by Howard Garns, a 74-year-old retired architect and freelance puzzle constructor from Indiana. That was the history of Sodoku, there are so many level range from the simplest to the toughest sodoku in the world, I have put it in the photos below, if you are interested, you can give it a try. This so called world toughest Sodoku was designed by some engineer using a computer, and it is believe that there is only one solution for this Sodoku, some may need a month to solve this puzzle. I will post the answer later after you have try it.... Have Fun!