Everyday new Killer Sudoku levels in 2 sizes and 3 difficulty levels. Use the normal sudoku rules to fill the grid with the numbers 1 to 9, such that each row, column and box contains each number only once. But on top of that, a Killer Sudoku grid is divided into cages with 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. Click on a cage to get hints on the possible values in that cage. Tip for the 9x9 sudoku: the total value of all numbers in a 3x3 box is always 45.