Killer sudoku solving rules start with the fact that you will have to get familiar with combinations, and those that sum to certain numbers. Since sudoku rules are already extremely well-documented and you will no doubt be familiar with them, we will instead look at the killer sudoku rules. Sudoku rules are those you will already be familiar with from standard sudoku: looking to see if there is only one place in a region where a value can go, looking at the possible values for each cell, looking to use region intersection rules and also looking at sets. There are two main sets of strategies: those that are generic to sudoku and those that are specific to killer sudoku. How do you go about solving killer sudoku? There is no doubt the grid can look quite intimidating at first, particularly as typically there will be no givens in the grid to get you started. As you'll notice, there is one addition to standard sudoku: the caged regions, and the fact that the numbers are actually used as numbers by that additional rule, as opposed to standard sudoku where the numbers could be replaced by any symbol.

Ensure that the numbers you place in each cage (dotted-lined region) sum up to the number given at the top-left of that cageĪnd that's it for the rules.

The regions are the 9 columns, 9 rows and 9 3x3 bold-lined boxes.

Place the numbers 1 - 9 once in each region.

First, let's look at the rules of the standard 9x9 killer sudoku puzzle:

Killer sudoku is one of the most popular sudoku variants.

Killer sudoku number combinations