Su-doku to create a whole new puzzle experience.
How to play Killer Su-doku
Like Su-doku, you must fill in all the squares, so that all rows, columns and 3x3 boxes have all the numbers from 1 to 9 in them. However, all of the numbers you enter into the dotted "cages" must also sum up to the number associated with the "cages" (in the top-left corner).
online play address: http://sudoku.oubk.com
