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.

(In reply to Solution by Penny)

I came up with the same solution as Penny. This was a very difficult puzzle, and a couple of times I screwed something up and needed to start again from scratch. That was a bit frustrating, but overall I thought this was a very fun challenge! Thanks once again, Josie!

Posted by Jyqm on 2008-06-23 19:37:29