Here is the most difficult sudoku puzzle of all times.

 A sudoku puzzle consists of a 9 × 9–square grid subdivided into nine 3 × 3 boxes. Some of the squares contain numbers. The object is to fill in the remaining squares so that every row, every column, and every 3 × 3 box contains each of the numbers from 1 to 9 exactly once.

Solving a Sudoku puzzle involves pure logic. No guesswork is needed—or even desirable. Getting started involves mastering just a few simple techniques.
This particular puzzle has a record degree of difficulty  ( 11 stars ) and is the world’s most difficult sudoku puzzle yet created.  It was three months in the making.

Luck has nothing to do with its solution.  After you surrender,  here is the answer:  http://www.efamol.com/uploads/2012sudoku-solved.jpg







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