Killer Kropki
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Apply classic sudoku rules.
A white dot between two dotted outlined regions indicates that the sums within those regions have a difference of one. A black dot between two such regions indicates that one of the sums is twice the other sum. When there is no dot between two regions, they cannot have sums that differ by one or are double. Digits may not be repeated in regions.
Sudokupad (no answer check)
Sudokupad (with answer check)
or
Penpa+.
Solution code: Row 9
today, 12:18 by Snookerfan
Beautiful, thanks!
today, 11:55 by marcmees
Great logical flow, interesting till the very end. Thanks
today, 08:54 by Piatato
Lovely!