The #1 best-selling puzzle and quiz book, "Brain Games for Adults"
A 'Challenge Edition' for adults looking for difficult problems has been published!

Over 40 puzzle and quiz types in one book!
The most spicy brain game you'll want to keep challenging
Creative hobbies that will wake up your hardened brain

『Brain Games for Adults』 was greatly loved by readers for containing various puzzle types such as mazes, word searches, find-the-difference pictures, and nonograms in one book, and immediately after publication, it rose to the number one bestseller in its category.
Thanks to this support, we have published the 『Brain Play Book Challenge for Adults』 with upgraded difficulty and problem types.

The challenge section includes over 40 puzzle types, including Sudoku, number finding, logic puzzles, and code solving, and the number of problems has been increased to 140, making it even more enriching.
Each game has a detailed explanation, so anyone, even those unfamiliar with puzzles, can try it.
There are a variety of problems, from easy ones that are good for cooling off your mind to ones that require you to work hard with your hands and head. As you solve them, you will naturally become smarter and feel a sense of fun and accomplishment.