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M2S is a puzzle which incorporates 3x3 magic squares into a Sudoku matrix. It is a puzzle inside a puzzle. Magic squares are a 3x3 matrix where the sum of the rows, columns and main diagonals all add up to the same number. In the case of a 3x3 matrix, the sum of the number is 15. In Sudoku, where the rows and columns contain the numbers 1-9, the cells in the magic square matrix can be used as clues to aid in solving the larger Sudoku puzzle.