Clearly '3' and '4' from two numbers must be 2,1 and 3,1 in some order and also if you think about 17 off two numbers and 16 off two numbers then these two are good places to start for the same reason. When first solving these puzzles it can be useful to use a combinations table just like you might with kakuro to find which sums have the fewest combinations and then look for these in the grid. at the start with no numbers placed in the grid then the maths / killer sudoku element comes into it more. Generally killer sudoku can be quite slow to get into and then solve quite quickly once you have broken the back of them the more you solve it the more normal sudoku solving rules come into play. The dotted cages contain a number that tells you the sum of the cells in that dotted cage region, and no number can be repeated.Ĭracking killer sudoku to a large extent just comes down to recognising the cages that have the least possible combinations and using this information to help whittle down the options. The main difference between this puzzle and normal sudoku is that it is also a maths puzzle and not just a logic puzzle, as it requires addition. However, by its very name the puzzle can seem quite intimidating, as it does sound quite daunting! Cracking Killer SudokuOne of the best known sudoku variants is killer sudoku.
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