"There are a number of good books that teach the basics of Sudoku. But there are very few that take you past the elementary ideas - and the ones I've seen are hard to understand. Here's a book that goes from the simplest level to the most complex - and it's easy to understand because of the diagrams! I highly recommend it.

-Dick Westwood, Westport CT

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"This is the best book I have ever read on how to solve Sudoku puzzles and I have read them all. I had reached a plateau and couldn’t seem to solve anything beyond just the medium newspaper puzzles. Now, after reading your book, I have been working hard and difficult puzzles. Your illustrations and strategy presentations are fantastic. Never do I attempt working on a puzzle without your book by my side. It has become my bible and I would be lost without it. I would definitely recommend this book to any student of Sudoku who wants to advance their knowledge of either basic or advanced Sudoku solving techniques.

Mr. McCollum you have done an excellent job in presenting the material found in your book. I can well appreciate the many hours upon hours upon hours you must have spent creating your illustrations and writing the strategies this book contains. My hat is off to you. I am sure others will be as equally impressed as I am.  Good luck,

-Glenn Daily, The Villages, FL