Usual sudoku rules apply. Also, the odd digits appear in the grey squares.
Place each of the numbers 1 to 9 into each of the rows, columns and bold-lined 3-by-3 boxes. You must also place the numbers in each dashed-line cage so that they add up to the given total.
The normal rules of Killer Sudoku apply, except, the usual 3x3 blocks have been replaced by irregularly shaped, coloured blocks (which must contain all the digits from 1-9).
The normal rules of Killer Sudoku apply. In addition, each coloured extra region must also contain all the digits from 1-9.
The normal rules of Killer Sudoku apply. In addition, both main diagonals (marked) and all cells of the same colour must also contain all the digits from 1-9.
The normal rules of Killer Sudoku apply. In addition, both main diagonals must also contain all the digits from 1-9.
9x9 and 12 x 12 formats
These Killer Sudoku puzzles have had the outlines of their cages removed, but the original rules apply, so that each row, column and 3x3 block should contain the digits 1-9. The sum of the digits for each missing cage is located, as usual, in the leftmost cell of the top row of that cage. No digit can be repeated within a cage, and there are no single cell cages.
The normal rules of Killer Sudoku apply. In addition, the grid is divided into coloured cells. Cells of the same colour must also contain all the digits from 1-9.
Usual sudoku rules apply. Also, the numbers in the shared set of 3 by 3 box is filled in identically, for both of the individual sudokus.
To begin, look at the digit which occurs most frequently in the grid. In which rows, columns and boxes is it missing? Also look at rows, columns and boxes which are almost complete – which numbers are missing and where could they go? The rest is up to you!
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