I have bought all of the books in this series, some of them two and three times, so I was pleased to see that a new edition was available. I have always managed to get to the end of the books although the last few puzzles have rather taxed me. This book seemed more difficult from the beginning and started to challenge me at an earlier point. So either my old age is taking its toll or the puzzles are, in fact, more difficult.
For those who like the challenge of Killer Su Doku I can thoroughly recommend this latest book. I think it has been produced by a different compiler and I am having to think along different lines to solve the puzzles.
Roll on No 8!!