The school principal has selected the best players of Sudoku. Now, this is your opportunity to show everyone how skillful you are at Mathematics. Think and pay attention to win.
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Click on the square and a line of numbers will appear. Click on the number you want to use. Complete all the lines and columns and you will win. You can click on the number you want to change. There is an "X" on the lines and columns that you can use to delete all the incorrect numbers. Do it quickly, time is running.