18 of 23 people found the following review helpful
This review is from: The Times Su Doku (Paperback)
The name is right: once you get into it, you are addicted, and you do one almost everyday. There are four levels: easy, intermediate, hard, and fiendish. Trust me: if you buy this, you will want to start at easy. Easy is not easy. Intermediate is slightly harder than you think. Hard is close to fiendish, and fiendish is just FIENDISH!
Logic and concentration is required here. It also helps build logic and concentration in one thing for a rather long time. They are also rather fun to do.