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The goal of Sudoku is to fill a 9x9 grid with numbers so that each column, row and 3x3 grid has numbers from 1 to 9. At the start of the game, some cells of the 9x9 grid will be filled. Your task is to fill in the missing numbers and fill in the entire grid using logic. Remember, the move will be invalid if:

- - Any string contains duplicate numbers from 1 to 9
- - Any column contains duplicate numbers from 1 to 9
- - Any 3×3 grid contains duplicate numbers from 1 to 9

Sudoku becomes a fun puzzle game once you get the hang of it. At the same time, learning how to play Sudoku for beginners can sometimes be difficult. So if you are a complete beginner, here are some tips to help you improve your playing skills.

- - Hint 1: Look for rows, columns, and 3-by-3 grids that have 5 numbers or more. Check the remaining empty cells by trying the unused numbers. In many cases, you will find numbers that can only be written in one cell, because the rest of the numbers are already contained in that row, column, or 3 by 3 grid.
- - Hint 2: visually break the grid into 3 columns and 3 rows. In each column and each row there will be 3 grids 3 by 3. Now look for rows or columns where there are 2 identical numbers. It is logical that in the remaining grid of 9 cells there should be a third copy of this number. Look at the 9 remaining positions to find the space for the missing number.

Now that you know a little more about Sudoku, play and have fun with this free online game.