Insane Killer Sudoku

Ok, a few regular readers have requested an INSANE Killer Sudoku puzzle so I had to respond. This puzzle should be very difficult to solve. In fact, it might require some trial&error attempts …

XXL Killer Sudoku, par Jesper

Easy killer sudoku - Solve free puzzles online

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Insane Killer Sudoku

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How long is Killer Sudoku?