What is Sudoku?
It is a number puzzle game played in 9x9 squares.
It is also famous as a famous Japanese game, but as history shows, Japan popularized it, but it is not an aid. Based in Latin Square, invented by Swiss mathematician Leonhard Euler in the 18th century, American architect Howard Garns introduced it in 1979 under the name Number Place.
The cells that make up Sudoku are subdivided into a total of 81 cells and 9 3X3 cells, and the rules to be followed are as follows.
-1~9 is inserted into each row column vertically without overlapping.
-In the 3X3 box, 1~9 are entered one by one without overlapping.
In the problem usually given, only a part is filled with numbers, so the number of the remaining cells should be inferred based on the above rule.
It's the perfect puzzle for killing time on a train or airplane!
1. Turn on the memo mode to take notes, such as solving a puzzle on paper.
Notes are automatically updated while filling the cells.
2. Find mistakes and challenge yourself or use automatic checks to see mistakes in real time.
3. Use free hints for problems that are difficult to calculate.
4. There is an unlimited undo, so if you make a mistake, you can go back to it.
5. There is an auto save so you can start over and continue.
6. With eraser function, you can remove the mistake.
7. Difficulty: Easy, Medium, Difficult and Professional, so you can match your skills.