Classic Sudoku description

Sudoku is a logic game from the puzzle games category. This game develops your thoughts process and it brings you into a beautiful world where you need to use your mind.
Playing Classic Sudoku brings more benefits: Spending quality time when you have nothing else to do, and developing your brain. It is known that people who play Classic Sudoku are more likely to come up with great solutions in difficult situations.
Puzzle games are great, but the top game from puzzle games is Sudoku. Have fun and get smarter!
Sudoku is a number placing puzzle based on a 9x9 grid with predefined given numbers. Your task is to place the numbers from 1 to 9 in the empty squares so that each row, each column and each box contains the same number only once, without being repeated.