I'm stuck - can anyone help?
On the third attempt, I've managed to complete all four corner puzzles (all logically filled in without guessing), but the centre one seems impossible even though you have the four corner squares completed. You can dub in the numbers in the squares that already had the 9, 2, 4 and 3 but it doesn't help as there are still too many possibilities for the middle square.
My centre puzzle is as follows:
8 5 3 * * * 7 9 2
2 7 4 * 9 * 6 8 1
9 6 1 * * * 4 3 5
* * * * * * * * *
* 2 * * * * * 4 *
* * * * * * * * *
5 3 6 * * * 9 2 7
7 9 2 * 3 * 8 1 4
4 1 8 * * * 3 5 6
Thanks
Cathy