For an outside square, the solution is always the outside total – 45. In general, to use the 45 rule, look for a row, column or block where all cages except one lie completely inside.įor an inside square, the solution is always 45 – the inside total. In the case, it was easier to calculate the inside total, but if the cage lying partly outside has one square outside and more than one square inside, the outside total should be used to calculate the outside square. This could also have been solved another way, by finding the 'outside' total - the total of all cages within the column, including the one lying partly outside.Īgain, as all the squares within the column must add up to 45, the 'outside' square is 54 – 45 = 9. The first is to use the strategies for solving regular sudoku puzzles. The 14 cage can now be completed by solving the other square as a 9. There are three basic methods used to solving killer sudoku puzzles. The more extreme (high or low) a sum is, the fewer possible combinations of numbers there will be. Try to find cages with very low or very high sums. In the above puzzle, there are several of these e.g. Now, as the whole column must add up to 45, the ninth square (the 'inside' square in this case as it is inside the column) must be 45 – 40 = 5. First try to find cages with only one cell. The numbers in this column will add up to 45.Īdditionally, because the first four cages in this column (the 15 cage, the two 9 cages and the 7 cage) lie completely within the column, the numbers in the first eight squares total 15 + 9 + 9 + 7 = 40.Ĭall this the 'inside total', because it is the total of all cages which lie completely inside the column. Take the first column of the Killer Sudoku shown in Figure 1. This way, Killer Sudoku puzzles are great for both beginners and advanced Sudoku solvers. Simple logic and basic knowledge of sudoku rules won’t cut it you as a player should know advanced sudoku solving techniques and understand how to apply them in practice. It’s an advanced level only for experienced sudoku solvers. This number puzzle game comes with several difficulty levels easy, medium, hard, and expert Killer Sudoku. What is Sudoku Evil Sudoku evil is a 9×9 grid sudoku puzzle with the highest possible level of difficulty. Therefore, the total of all numbers in one row, column or block will always be 45. Although Killer Sudoku seems a bit harder than classic Sudoku, we made it accessible for players of all skill levels. This uses the fact that every row, column and block must contain each of the numbers 1 to 9 once. The 45 RuleĪn essential Killer Sudoku solving technique is the "45 rule". You will need new specialised Killer Sudoku solving techniques to progress in these puzzles besides the standard Sudoku techniques you will already know. Fill the grid so that every row, every column and every 3x3 box contains the numbers 1 to 9 Published: 7:00 PM. Click on the links below to download PDFs which are set to print on A4 paper. Killer Sudoku adds a new dimension to standard Sudoku, requiring arithmetic to solve. FREE PRINTABLE ULTIMATE KILLER SUDOKU - Richardson Puzzles and Games.
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