Normal Sudoku rules apply.
The grey lines join consecutive digits, not all lines have been drawn.
The two marked cages (top left and bottom right) are Magic squares that total 25 and 15 respectively.
Digits may not repeat in rows cols and summed diagonals.
Solution code: Row 1, Row 9
on 2. March 2021, 19:57 by filuta
Thanks a lot, really enjoyable puzzle!
on 2. March 2021, 03:43 by panthchesh
Thanks for the puzzle! :)
on 1. March 2021, 12:36 by Nairi
Right, this is an oversight on my part. Didn't consider the big magic square at the end at all!
on 1. March 2021, 10:51 by skywalker
Hi Nairi, I think everything is ok. In magic squares digits cannot repeat on diagonals, also.