Place the numbers 1 to 9 once in each row, column, long diagonal and 3x3 box. Obviously, the central yellow-coloured 3x3 box is common to both grids.

The number in the cage (or shaded area) represents the result of an arithmetical operation by its accompanying sign. For example, 4÷ in a two-celled cage means that it contains either 8 and 2 or 4 and 1 (in any order).

Unlike Killer Sudoku, the same number may appear more than once in a cage. So, 28x in a cage which overlaps the 3x3 grids may contain two 2s and a 7.

Once again, I wish to thank brianjn most sincerely for his continued support. He converted my black and white Excel image to a coloured one in 'jpg' format.
Acknowledgement to Peter at sudexel.com for beta testing the puzzle.

Unless I missed one or more possibilities filling in the left-top 9x9 grid, I came up with 3 possible 3x3 grids that would be shared between the two 9x9 grids:

6 1 9      6 1 9      6 1 9
2 4 3      2 3 4      4 3 2
7 8 5      7 8 5      7 8 5

Unfortunately, the first column of the right-bottom 9x9 grid already contains a 7 in the column (21x = 3,7), which excludes any of the above possibilities.


Is there any additional hints you might give?

Posted by Dej Mar on 2008-06-23 05:21:29