This puzzle has a Hodoku grade of Hard (1376) so it would have qualified for inclusion in my book as all the puzzles there have a Hodoku grade between Hard (1000) and Hard (1999).
Andrew Stuart gives it a grade of 201 (Very Hard) on his main page but calls it Diabolical when you look at the solve path.
Please click here if you would like to see my book. Amazon shows you the first 18 puzzles in the preview.
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