Frame Sudoku (also known as "Outside Sum Sudoku" and "Sum Frame Sudoku") consists of an empty grid. Numbers in the outside frame equal the sum of the first three numbers in the corresponding row or column in the given direction.
In some sudokus main diagonals also contain the digits 1 through 9. This variant is called "Diagonal Sudoku" or Sudoku X. Use the check box Diagonals for such sudokus.
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