Rules:
Normal Sudoku rules apply.
Digits may not repeat in a cage and must sum to the number in the top left corner of the cage.
Cells with a 7 dot between them must contain digits that have a difference of 7. Not all dots are given.
The little killer diagonal must sum to a multiple of 7.
The cell with a gray circle must contain an odd digit.
NOTE: I used Google Translate to type the rules in German - I do not speak German; I hope it translates okay!
Solution code: Column 2 followed by column 8.
on 11. September 2021, 01:28 by uvo_mod
Label "Online Solving Tool" ergänzt.