![]() Although we don't know the order in which the 4 and 6 are placed, either way round the sum total is the same: 10. This shows another very simple piece of logic that can be used to help solve killer sudokus. ![]() This just leaves us with 2,4,5,6 as the options left for the top left 3x3 box, which means we know that the '7' must be composed of 5 and 2, leaving the 4 and 6 in cells R1C7 and R1C8. We can continue like this, marking the '4' off two two cells starting at R2C7 as 1,3, and eliminating from the other cells in the third 3x3 box too. Similarly, the '24' off three cells starting at R1C9 must be 7,8,9, and this time not only can 7,8,9 be removed from all other cells in column 9, they can also be removed as options for all the other cells in the third 3x3 box. We now know where the 1,2 must be in column 9 and therefore know none of the other cells can contain it. We also see a '3' from two cells starting at R6C9, so those two cells can be marked with 1,2. Then, you can eliminate those numbers from the other cells in the affected region(s), limiting their options and combining them with standard sudoku rules to help you solve the puzzles.Ī quick scan of the grid reveals that we have a '6' made from three cells starting with the cell R3C5 (which means third row, fifth column), so those three cells can be marked with 1,2,3 as the options straight off. ![]() The easiest way to get started with killer sudoku is to look for sum cages that have only one possibility. Let's look at some tips that can be used to help solve these puzzles using the first puzzle in the magazine, to the right. The puzzle magazine of killer sudoku puzzles contains 100 absorbing killer sudoku puzzles for you to enjoy.īut for the uninitiated, the starting position of a killer sudoku puzzle with givens at all can strike fear into one's heart (or at least appear intimidating).
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