The rules for Killer Sudoku are simple. The rules for regular sudoku apply, with one additional rule: The sum of the cells in a cage must equal the total given for the cage. Each digit in the cage must be unique.
As in regular sudoku, every cell in each row, column, and nonet must contain a unique digit. In other words, each row, column, and nonet must contain all the digits from one to nine.
The values of the cells a cage must sum up to the total for that cage.
The values of the cells in a cage must be unique.
If there is a '>', '<', or, '=' between to cages, then the sum of the values in the cages must obey the relationship specified.
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