I can't believe this is as far as I can go with this puzzle. It's a Pappocom puzzle rated very hard.
Here're the clues"
----------------------
. . 2 | . 4 . | . . .
. . . | 6 . 7 | 8 . .
1 4 . | . . 8 | . . .
-------+-------+------
9 . . | . . . | 4 . 3
. 6 4 | . . . | 5 1 .
7 . 3 | . . . | . . 8
-------+-------+------
. . . | 4 . . | . 3 5
. . 1 | 5 . 9 | . . .
. . . | . 2 . | 6 . .
-------+-------+------
Here's where I am:
-------+-------+--------------------------------
68 78 2 | 39 4 35 | 1379 795 1679
35 359 59 | 6 1 7 | 8 24 24
1 4 67 | 2 395 8 | 379 579 679
-------+-------+--------------------------------
9 1258 58 | 178 5678 1256 | 4 267 3
28 6 4 | 3789 3789 23 | 5 1 279
7 125 3 | 19 569 4 | 29 269 8
-------+-------+--------------------------------
268 2789 6789 | 4 678 16 | 1279 3 5
34 2378 1 | 5 3678 9 | 27 2478 247
345 35789 5789| 1378 2 13 | 6 4789 1479
-----------------------------------------------
You don't know how it hurts to say "uncle".
I created these using "word" and they looked great but now they suck. Sorry about that.