Those addicted to Kakuro will enjoy this puzzle book.
Fun and just hard enough to be challenging.

This book of puzzles is very difficult. Where the difficulty lies with the solving itself, that's fun. Where the difficulty lies with deciphering what the puny, pale numbers are, then, not so fun. Work the puzzles under very good lighting and bring a magnifying glass.

Not a bad collection of puzzles, but as a previous reviewer said, the puzzles are very difficult to read. Mensa Kakuro is much better if you're looking for tough puzzles - better puzzles and easier to read. The Everything Kakuro Challenge Book by Timmerman is the best collection, the best puzzles I've ever done. All of them are on par with the best Dell Cross Sums, which I've been doing for over 25 years,

I had little difficulty reading the puzzles (per the previous reviewer), and found the puzzles themselves large enough to easily work with (compared to many others). They range from difficult to nearly impossible, but somehow I managed to make my way through the entire collection. Overall, I found the puzzles fully enjoyable; this was a collection I always enjoyed pulling out for some mental gymnastics. I wish Bumgardner would come out with a Volume II, as he has a good sense of Kakuro style--puzzles that make you think, but not necessarily (compared with, say, the Dell collections) make you have to work more than think.

This book has puzzles difficult enough to be challenging without having to resort to looking up the answers. BUT! The numbers are small, skinny, and white, on a medium gray background and very hard to read. As with most kakuro books, the puzzles are way too small. Enlarge 40% and darken the background, and you're set to go. To me, it has been worth it due to the quality of the puzzles.