Killer Sudoku

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Killer Sudoku is for the most ardent Sudoku fans. Sudoku rules plus one additional rule: the sum of the cells in a cage must equal the cage's total, and each digit in the cage must be unique. Tip: In a 3x3 box, the total value of all numbers is always 45.

How to play

As with Sudoku, the objective of Killer Sudoku is to fill the grid with the numbers from 1 to 9, such that each row, column, and the box contains each number only once.

Additionally, a Killer Sudoku grid is divided into cages. The values of the cells in a cage must sum up to the total for that cage, shown in the cage's top left corner. The same number cannot appear in a cage more than once.


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