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 14 cage can now be completed by solving the other square as a 9. 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. 100 puzzles in all with regular updates to reach this total in the first year post launch.Killer Sudoku adds a new dimension to standard Sudoku, requiring arithmetic to solve.Mark and Simon have both represented the UK many times at the World Sudoku Championship and you can find more of their puzzles (and lots of others) on the internet’s biggest sudoku channel Cracking The Cryptic. Anyone familiar with their YouTube channel will know that Simon and Mark take pride in teaching viewers to be better solvers and, in these games, they always craft the puzzles with the mindset of trying to help solvers improve their skills. Of course the difficulty is carefully calibrated to ensure lots of puzzles at every level (from easy through to extreme). Only the most dedicated (and cleverest) sudoku players will finish all the puzzles. The more puzzles you solve, the more stars you earn and the more puzzles you get to play. In Cracking The Cryptic’s games, players start with zero stars and earn stars by solving puzzles. So you know that every puzzle has been play-tested by a human being to ensure that each sudoku is interesting and fun to solve. Fans of Cracking the Cryptic's YouTube channel will recognize many of these authors as some of the most talented creators working today!Īs with our other games (‘Classic Sudoku’, ‘Sandwich Sudoku’, ‘Chess Sudoku’, 'Thermo Sudoku' and 'Miracle Sudoku'), Simon Anthony and Mark Goodliffe (the hosts of Cracking The Cryptic) have written all the hints for the puzzles. The puzzles in Killer Sudoku are created by Simon and Mark as well as a large number of guest creators. This extra information leads to beautiful logic that you will master as you progress through our handmade puzzles. In Killer Sudoku, every puzzle features cages that tell you the sum of the numbers inside.
Presented by Cracking The Cryptic, YouTube’s most popular Sudoku channel, comes a new game based on our most requested variant: Killer Sudoku.
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