If you like Sudoku but want an extra challenge then you will love Killer Sudoku.
Killer Sudoku (also known as killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is like regular Sudoku, however, you must also place the numbers so that each dashed-line ‘cage’ adds up to the totals written in the corner of the cage.
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