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.

First, here is the answer:

9 7 3 1 5 6 4 2 8 
2 1 6 9 8 4 5 3 7 
4 5 8 7 3 2 1 9 6 
8 3 4 2 9 5 7 6 1 
1 2 9 6 7 8 3 5 4 
5 6 7 4 1 3 9 8 2 
3 8 2 5 4 7 6 1 9 3 4 5 8 2 7 
7 9 5 8 6 1 2 4 3 8 1 7 5 9 6 
6 4 1 3 2 9 8 7 5 2 6 9 3 4 1 
            5 8 1 7 3 4 9 6 2 
                        9 3 4 1 2 6 7 5 8 
<o:p>                   7 2 6 5 9 8 4 1 3 
                        3 9 8 6 5 2 1 7 4 
                        4 6 7 9 8 1 2 3 5 
                        1 5 2 4 7 3 6 8 9

Edited on June 24, 2008, 1:17 am

Posted by nikki on 2008-06-24 01:17:25