What is Sudoku?
Sudoku 1-150
Correct answer

Sudoku develops complex thinking skills and improves concentration and memory.
Sudoku, not your smartphone: The smartest way to wake up your brain

There is a term called digital dementia.
It refers to a state in which memory or calculation ability is greatly reduced due to excessive reliance on digital devices such as smartphones and computers to store the memories needed by humans.
Although this is not a medical term, it was coined as modern people, with their high dependence on digital technology, are using their brains less and less, leading to symptoms such as forgetfulness and dementia.
In particular, in our country, the smartphone dependency rate is quite high regardless of gender or age.
Since I never let go of my smartphone except when I'm sleeping, I find myself using my brain less.
There is no need to take notes or memorize things.
Because everything I need is in a small smartphone.

That's why the term "digital detox" came into being.
It aims to promote physical and mental recovery by escaping from excessive use of digital devices and services.
They say that the human brain deteriorates if we don't use it, but we are using our brains less and less.
So, there is talk that even young people are suffering from digital dementia.
So, you have to keep exercising your brain and using your head.
So how can we use our brains in the digital age? Sudoku is the perfect solution.
The Sudoku game naturally uses your brain as you write numbers from the first square to the last and think of the correct numbers.
Solving problems like this, guessing the number that goes in the next cell and recalling the number you wrote down before will also help improve your concentration and memory.


Convenient for both left-handed and right-handed users with the top spring!
Everyone from beginners to experts can join us at various levels!
Once you start, you won't be able to stop, and you'll be captivated by the endless charm of Sudoku!

What is Sudoku, something unheard of even a few years ago? Sudoku, which means "non-overlapping numbers" or "single-digit numbers," is a number puzzle game where players arrange the numbers 1 through 9 in a grid of 81 squares, each 9 in a row and 9 in a vertical column, without overlapping.
The rules are simple and straightforward, making it seem easy, but as you try to solve the problem, you will realize that it is not that easy.

《Topspring Sudoku》 is a book that goes one step further than the existing spring book, allowing you to solve Sudoku by turning the pages upwards like turning the pages of a desk calendar.
It is comfortable for both left- and right-handed users, and the book opens fully, making it ideal for note-taking and problem-solving.
It takes up less horizontal space, so it's easy to open anywhere, so you can enjoy it comfortably whether you're sitting or lying down, and the upward-swiping structure makes page navigation intuitive.
For Sudoku beginners, the beginner and intermediate levels are grouped together into "Top Spring Sudoku Beginner/Intermediate", and the advanced and special levels are grouped together into "Top Spring Sudoku Advanced/Special", so even readers who are solving Sudoku for the first time can solve the problems without difficulty, which is another advantage of this book.
I hope that anyone, regardless of age or gender, will develop their reasoning and logical skills through Sudoku, and experience the pleasure, fun, and sense of accomplishment that comes with solving each problem.