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Created by the world's best professional gamer, Oh Jeong-hwan
High-level Sudoku books

Do you know what the most popular puzzle in the world is? It's Sudoku.
The origins of today's Sudoku began in 1979 when architect Howard Gans first introduced it under the name "Number Place."
Meanwhile, there is a theory that Sudoku was first called 'Sudoku數獨' by Nikori Publishing of Japan, meaning 'limiting the number to one'.
Whatever its origins, it is clear that Sudoku is the most popular math puzzle in the world.
The reason Sudoku is popular in major media outlets, including the British Times, is clearly because it has a special charm.


Although various types of Sudoku have been introduced and loved by people all over the world, puzzlers have always been thirsty for more sophisticated and scientific Sudoku.
"Super Sudoku 500 Problems Intermediate" will quench that thirst.
The Sudoku in this book is not the mechanical Sudoku that has been created by combining computer programs.
These are high-level problems created one by one by professional gamer Oh Jeong-hwan, the best puzzle expert.
From Sudoku beginners to enthusiasts, it will satisfy your thirst for true Sudoku.


500 more sophisticated Sudoku problems
Take on the "Super Sudoku 500 Intermediate" Challenge

Following the publication of “Super Sudoku 500 Problems Beginner-Intermediate,” “Super Sudoku 500 Problems Intermediate” has been published.
If you've mastered beginner Sudoku, try the intermediate difficulty level.
Intermediate level problems range from those that are easier to solve than you might think to those that are difficult to solve because it is difficult to find a definitive number.
Sudoku 500 problems are divided into levels 1 through 5, so you can feel a sense of accomplishment as you solve them step by step.
For Sudoku beginners and even enthusiasts, there comes a time when they almost fill in all the numbers in a square, only to discover a mistake and have to go back to the beginning.
But let's not give up.
Another fun aspect of solving Sudoku is checking the numbers one by one to find out where the error is.


Improves logical thinking and concentration
The best brain development program

Sudoku only has the basic rule of 'filling in the numbers 1 to 9 in the 9 squares of a 3x3 box, in the horizontal and vertical rows.'
However, solving the problem requires a high level of concentration.
If you let your guard down for even a moment, numbers will start to overlap everywhere, and you'll have to go back to the beginning.
Once you start solving the puzzle, you will be on edge trying to fill in the numbers from 1 to 9 without repeating them.


The appeal of Sudoku lies, above all, in its logical thinking and reasoning.
According to the rules, you have to think of the number that goes in the next square and compare it with the numbers in the other squares.
In this way, puzzlers naturally train their brains by scientifically inferring and logically arranging numbers.
Solving Sudoku can help you improve your concentration, memory, and logical thinking.
Sudoku is also addictive, making it impossible to put the book down until the last square is filled in.
The thrilling sense of accomplishment you feel when you fill in all the squares is also an undeniable part of Sudoku's appeal.
Let's experience the real Sudoku, where neither guessing nor luck can help, and only logic can win, with "Super Sudoku 500 Intermediate".