For the puzzle as a whole: fill in the digits 1~9 in every outlined area and twice in the yellow squares.
Solution code: The marked column, followed by the marked row.
on 23. December 2022, 03:13 by Nick Smirnov
Penpa:
https://tinyurl.com/2muoe4f9
on 27. January 2010, 20:49 by saskia-daniela
Wenn man die Diagonalen nicht vergisst, wirds deutlich einfacher... ;-(
on 27. December 2009, 00:49 by cornuto
ganz schön heftig, aber schön.
on 25. December 2009, 19:47 by Richard
@Luigi: yes.
on 25. December 2009, 17:17 by Luigi
Hi Richard! Now I know what you ment recently....
One question though: You say both diagonals have to show the numbers 1 to 9. Does this mean for the long diagonal that the first nine digits from botton left show the numbers 1 to 9 and the first nine digits from top right as well?