Hitori puzzle: big and difficult

It’s been a while since I last posted this kind of puzzle. You can read about these “reverse sudoku” puzzles here: – The rules of Hitori – How to solve Hitori This one I’m posting now is going to be a difficult one. I hope. Some have claimed that my Hitori puzzles are not difficult. What do you think?

Hitori 15×15 for January 31, 2012.

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sudoku variants and other puzzle books

To see the solution to this puzzle click here