![]() ![]() Then do the same with three and four digit sets. You can type these possible numbers in each square. 17 can only be 9 & 8 but 8 could be 1 & 7, 2 & 6 or 3 & 5 so it can’t be 4 & 4 because each row, column, block and set can contain only one of each number. For example, the total 3 can only be 1 & 2. ![]() Then look for two-digit sets and work out the possible combinations. Single digits can be filled in straight away. ![]() Use the mouse or arrow keys to select cells within the grid and then enter a number by pressing the corresponding key or using the on-screen keypad. Use these totals to find the right numbers to solve the puzzle. No number is repeated in any of these sets. The numbers that occur in the squares linked by a shaded line add up to the total given in the top left-hand corner of each set. The difference is that you are not given numbers to start you off. The Killer Sudoku / Addoku is like a traditional Sudoku in that every row, column and 3×3 block must contain the numerals 1-9. ![]()
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