In addition, some fields in the edge rows/columns are marked with circles. The numbers entered in these fields must show how many skyscrapers are visible from that place in the inner 3x3 square. All these fields are marked.
Solution code: Both diagonals (top left to botom right, top right to bottom left)
on 11. November 2021, 20:34 by str
I set it up on Penpa+ at https://git.io/JX7qj
on 19. September 2020, 02:17 by SudokuExplorer
Fun puzzle! Quite challenging for its size :-)
on 8. August 2020, 01:33 by Ryx
I rated easy, since it only took me 3 starts to get it right ... I think most folks here are more adept at solving, so it might be very easy for them.
Nice puzzle!
on 19. April 2020, 20:19 by glum_hippo
What a marvelous idea! I'm a bit apprehensive of 00034Q now, though... (the quintuple 'scrapers...)
on 26. March 2013, 21:07 by bromp
Absolutely amazing
on 17. March 2013, 17:51 by CHalb
Wow, what a great idea!