Second-Degree Black Belt KenKen (Martial Arts Puzzles Series) Paperback – 7 April 2018

I have loved doing ken ken or calcudoku for many years. So I consider myself a little bit of an expert and enjoy the more challenging puzzles. This was definitely challenging. Half of the book had all of the math signs in it and the other half does not. I enjoyed both. Sometimes one puzzle would take me several days but I’d enjoy working on it a little bit at a time. if you’re a beginner in these puzzles, I would not go for this book, but maybe one of the easier books by the same author. I am just about finished with all 300 puzzles, and I’m trying to buy another book by the same creator.

I really like the challenging puzzles and that half the puzzles have operation symbols and have do not. The half without the operation symbols add a higher degree of difficulty which I really enjoy. I also have the first degree book which is also outstanding.

Exactly as it is advertised, great book.

Very good puzzles and for the advanced KenKen enthusiast. However, the puzzles are two to a page and too small for me to make notations while solving them. I had to scan and reprint them on my computer to use them. I'd happily pay the same amount for these very interesting and challenging puzzles for half the number of puzzles printed one to a page.

Very good selection of puzzles – – challenging but not impossible.