I just came across this puzzle that I abandoned half-finished weeks ago, and still can't get any further. This is as far as I got. The numbers in blue are mine.
21*|59*|***
394|81*|*56
*57|3**|*19
---------------
*7*|43*|*8*
*3*|*78|***
*4*|*59|***
---------------
725|*41|3*8
183|**5|*74
469|783|125