5 of 5 people found the following review helpful
Good for Insomniacs,
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This review is from: The Times Ultimate Killer Su Doku (Times Su Doku) (Paperback)
Certainly good value for money with 100+ hours of brain squeezing for most of us mere mortals. At this level of difficulty, perhaps the rating system becomes more subjective, as I found similarly rated puzzles took vastly different times to complete. Also I would prefer the squares to be printed slightly bigger (the size of the Observer Killer is, IMO, ideal). The cheap book format makes holding and doing the puzzles easier on the right hand page than the left, if you are right handed.