![]() 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. 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. Therefore, the total of all numbers in one row, column or block will always be 45. 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. Killer Sudoku adds a new dimension to standard Sudoku, requiring arithmetic to solve.
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