Propagation
(Published on 19. April 2026, 10:46 by Fool on Hill)
This puzzle is definitely rather harder than my previous puzzle Glyphs, which introduces the logic, and also Odd socks. Those two puzzles use German Whispers. Here I have migrated to XV clues - having noted that the X clues are consonant with the logic. I have also used a V clue rather than a black dot. The previous puzzles are definitely quite easy for people who know the basic logic. I have built in - I hope - a variety of deductions to this one. I have set it initially at 3/5: though it can still be done quite quickly, I think there will be pause for thought.
The additional challenge I will set is to resolve the V clue as early as possible in the solve.
Puzzle rules
Normal Sudoku rules apply.
On a pink Renban line the digits form a consecutive set with no repeats.
Digits separated by a white dot are consecutive. (Partial kropki)
Digits separated by an X sum to 10, and digits separated by a V sum to 5. (Partial XV)
Play here on Sudokupad: Propagation
Solution code: Column 5
Comments
on 22. April 2026, 19:48 by damo_89
Very happy that the resolution of the V clue was done via the intended method.
on 19. April 2026, 16:01 by Marius
Lovely!
on 19. April 2026, 15:05 by Exigus
Had a fantastic time colouring. Thanks!
on 19. April 2026, 14:51 by Snookerfan
Fabulous puzzle! It started really easy, then there were a few hard steps with superb deductions, including the X in Box 7 and the V-clue, that made my day. I would be very impressed by anyone who could resolve that V-clue early in the puzzle as it was the hardest and one of my final steps. Thanks for this gem
on 19. April 2026, 11:34 by Elliott810
Brilliant construction! Thank you:)
