These marks are very important in killer sudoku x. If we then begin marking in the remaining fits for some more of the cage we can start to progress: For example in the right-most column we can mark in the 1, 2 and 4 for the '7' cage as well as an 8 and 9 in the '17' cage. You also cannot repeat a number within a cage, so this means for example that the solution to '7' over three squares can only be 1 and 2 and 4, not any other combination such as 1 and 3 and 3 (although in this particular case two 3s would break the normal rules of Sudoku in any case).īy marking some of the 'only fit' numbers in as pencilmarks we can start to solve the puzzle. For example, the three squares at the bottom-right corner of this puzzle inside the '7' cage must add up to 7. Additionally, however, you must also place the numbers so that each dashed-line 'cage' adds up to the total given at the top-left in smaller digits. ![]() In Killer Sudoku-X you must place each of the numbers 1 to 9 (or the width of the puzzle) into all of the rows, columns, bold-lined boxes and each of the two main diagonals (shaded in pink on puzzlemix). ![]() ![]() In other words, it is Killer Sudoku with the additional constraint that each of the two main diagonals must also contain each of the numbers 1 to 9 (or 1 to whatever the width of the puzzle is). Killer Sudoku-X is a straightforward combination of Sudoku-X and Killer Sudoku.
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