When solving a puzzle, try filling in empty spots with all the candidates that might fit there. Fill in the CandidatesĪ “candidate” is a number that could fit in a spot, even though other numbers might fit there too. ![]() That makes it easier to place the remaining 7s. Use this to figure out which rows, columns, and boxes don’t yet have a 7. You can click a 7 on the board to highlight all five 7s in the puzzle. For example, if the 7 button has a small 5 in the top right corner, that means there are already five 7s on the board. Start with the big numbers that appear most often. Each of these buttons has a small number in the top right corner - that’s the number of times that the big number already appears on the board. Spot the missing numbersīeneath each puzzle are buttons you use to enter the numbers 1 to 9. Once you’ve solved that piece of the puzzle, move on to the next part. Start by focusing on a column, row or box. Any one Sudoku puzzle contains multiple puzzles within it. When solving Sudoku puzzles, players often feel as if they need to solve the entire puzzle from the beginning. Try using the following techniques to solve Sudoku puzzles. Try timing yourself to see how fast you can beat a given puzzle. You can change the difficulty level in Sudoku from beginner to intermediate or advanced if you want to solve more difficult puzzles. Use the orange guide to see which numbers you've already used in each row, column, and box. For an outside square, the solution is always the outside total – 45.To play our free online Sudoku game, tap and hold a number to lock it and you can use it for multiple cells. Use the numbers 1-9 in each of the 9 rows, 9 columns, and 3x3 boxes of the Sudoku grid. 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 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. Killer Sudoku adds a new dimension to standard Sudoku, requiring arithmetic to solve.
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