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Killer Sudoku is a logic puzzle based on a 9x9 grid with several prefilled numbers. Each puzzle consists of a 9x9 Sudoku grid containing areas surrounded by the same background color.
The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column, and 3x3 box. There is an added twist: You'll also see various shaded cages with a number at the top left.
For a more comprehensive guide please read our How To Play Killer Sudoku
The sum (addition) of the numbers entered into each respective shaded area must be equal to the clue in the area's top-left corner, and no number may be used in the same shaded area more than once. There is only one valid solution to each Sudoku puzzle.
Killer Sudoku is best experienced in Portrait mode on mobile phones.