Play the game Killer Sudoku or Sumdok. Fill the grid with numbers from 1 to 9 so that each row, column and box contains each number only once. In addition, the grill for Killer Sudoku it is divided into cages, and each cage has its own background color. The values of the cells in the cage added together must correspond to the total number placed next to that cage (shown in the upper left corner of the cage). The same number cannot appear in a cage more than once.

Killer Sudoku adds an extra layer of challenge compared to classic Sudoku. It requires more advanced logic compared to classic Sudoku, as players must use a combination of mathematical thinking and strategy to solve the puzzle. This variation often provides more of a challenge to more experienced Sudoku players.

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