Killer sudoku is similar to the other levels in that each of the numbers 1-9 must fit into each 9-by-9 square. No number can ...

In sudoku, you have to place the numbers 1 to 9 into a square 9-by-9 grid. There are nine 3-by-3 blocks within that grid, and you have to place the numbers in each block, row and column so there are ...