Having worked through Fiendish Su Doku 1 & 2 and also doing the puzzle in the newspaper sometimes I have become quite experienced with these type of puzzles. It means I have found the puzzles in this book somewhat easy so far (the first 100 puzzles). While this is good for my confidence it has not been very challenging for me. Maybe now is the time to publish a book of some Fiendish, mostly Super-Fiendish, and some Extreme puzzles. There must be a market for that. I would buy it anyway.
However, to anyone who wants their puzzles pitched at this level it is a good collection.
Addendum: Having put down Extreme Su Doku 2 a log time ago I picked it up again. I've realised that the puzzles are not as extreme as I once thought. I've left quite a few unfinished but I have finished a lot more than I would have thought possible until recently. Therefore I advise anyone who is finding the Fiendish Su Doku books a bit too easy to progress to Extreme Su Doku 1 & 2.
I bought this for my mum as a gift for mother's day, she finds the standard Sudoku books a bit easy now as she has been doing them for quite a while. She loves this book, says it really challenges her and has already dropped hints about getting her the next one for her birthday.
A good challenge and picks up difficulty right from the start and by the end is quite testing for I should imagine....most people. I loved it. Avoid book 6 in this fiendish series...it is nowhere near this standard.
Bought this book from the 'used' section. The book itself was in fair condition with 20 puzzles completed by the previous owner. Still a fairly good bargain as they are quite expensive to buy new even on Amazon