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KILLER SUDOKU

The most "numerical" variant: in order to solve this one you cant't merely consider numbers as symbols. You also have to count!
Fill the grid so that every row, column and 3x3 sector contains once each of the numbers 1 to 9. The peculiarity of this variant is that the grid contains a series of "zones" with a different border and a little number on the top left: the result of the sum of the numbers contained in this zone (of course all different numbers) has to be that little number.

Easy
sudokuKILLER_F_.jpg

Difficult
sudokuKILLER_D_.jpg

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