Killer Sudoku

Play Killer Sudoku or Sudoku. Fill the grid with the numbers 1 to 9, so each line, column, and box consists only once per digit. However, a Sudoku killer grid is split into cages, each cage has its own background color. The cell values in a cage must be summed up to the average for that cage, shown in the top left corner of the cage. There can be no more than once the same amount in a container.