Killer sudoku: play killer sudoku or sumdoku. fill the grid with the numbers 1 to 9, such that each row, column and box contains each number only once. additionally, a killer sudoku grid is divided into cages, each cage has its own background color. 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. a mind games game.
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