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# Sudoku

In many countries, Sudoku has become a popular mental exercise. Sudoku is a puzzle game that follows certain logic and the higher the player level, the more time, patience and calculation the player will need to solve Sudoku. The player's task is to fill in the numbers in a 9x9 grid so that each row, each column, and each of the nine 3x3 subgrids that make up the main grid contain all the digits from 1 up to 9. Sudoku will be given several numbers and in any position. Each puzzle in the game has a unique solution.

## Sudoku rules

Fill in the remaining cells with the following criteria to follow the Sudoku rule:

1. Horizontal row: Must include all numbers from 1 to 9, but do not need to be contiguous but must not overlap.
2. Make sure there are enough numbers in the vertical rows from 1 to 9, don't repeat any numbers and they don't have to be in a particular sequence.
3. Each 3×3 rectangle must include all the numbers from 1 to 9, without any repetitions.

## How to play

If you are just starting out, you should choose easy levels to get used to the gameplay of this game faster:

Step 1: When starting the game in this default 9x9 form, start solving the large tiles with the most numbers. I give you an example this bottom right box, if you want to enter the number 1 in this box. Find out which vertical or horizontal rows have a 1 and you won't get a 1 in that row.

Step 2: Similarly, solve in the large cells that have the most numbers. This will make it easier for you to start the game.

Step 3: As in the box above, I cannot fill in the number 3 in the rightmost row because it will coincide with the number 3 in the row near the right. The number 2 coincides with the horizontal row below.

Step 4: Then, when you have solved a large Sudoku square, see which row around that large square has the most numbers. Here I have an upper row and a left vertical row only 2 numbers need to be solved.