My husband loves puzzles like Sudoku.
This book drives me to that process more than any other, including more often than with Frank Longo's other good book "Second-Degree Black Belt Sudoku".
I spent, I don't even know how many, hours on the first puzzle trying to find that hidden relationship to move forward.
These are much more difficult than the ones you can buy in local stores. About half can be solved fairly quickly by an experienced person but the other half take real time and... Read morePublished 17 months ago by Carol Filippi
First off, there are instructions on how to play sudoku. I got the black level, if someone is getting an advanced level do you think they need instructions? Read morePublished 18 months ago by Flameboy451
I really like this book, it's difficult but great fun. The puzzles do present a challenge, but they're not impossible to solve.Published on June 23, 2011 by J.Lacher
I spent, I don't even know how many, hours on the first puzzle trying to find that hidden relationship to move forward. Well, there wasn't one. Read morePublished on June 2, 2011 by Greek Geek
Definitely challenging. Had to go through a lot of other "challenging" books that were all but... This one is difficult enough without making you feel totally inadequate. Read morePublished on February 20, 2011 by mjoy