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The aim of Sudoku is to fill every square in the 9 by 9 grid so each row, column and outlined 3 by 3 boxes contain the numbers 1 through 9 once only.

Once the grid is complete it can be submitted to the leader board and, if correct, the user will be awarded points based on the difficulty of the puzzle.

To complete sudoku puzzles you need to learn the various strategies, which we will cover in depth later.