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killer sudoku puzzles
killer control center
Killer sudoku (also killer su doku , sumdoku , sum doku , sumoku , addoku , or samunamupure ) is a puzzle that combines elements of sudoku and kakuro . Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic ; the hardest ones, however, can take hours to crack.