Black Belt KenKen® (Martial Arts Puzzles Series)

Great for KenKen fans - all 8 & 9 square puzzles!I have yet to reach the second half of the book, where all are 'operationless' (no mathematical signs), but these difficult puzzles are a must for anyone who progresses beyond the more basic games.

I recently reviewed another ken ken book and asked for more difficult ones. At last I have been rewarded and highly recommend this book. Definitely not for beginners, you need to combine the advanced skills of sudoku, killer sudoku and kakuro to be able to tackle these. Each page contains an 8 x 8 and 9 x 9 puzzle. With so many options in some cases, it is easy to go wrong. But if you love a challenge, this is the book to have.