Douro
(Published on 12. March 2026, 23:32 by Xenonetix)
• Normal Sudoku Rules apply.
• There's a one-cell wide orthogonal 'river' snaking from R9C9 to R1C2 without branching or touching itself orthogonally (but may touch diagonally). Digits along the 'river' differ by at least 5 (German Whispers). All remaining cells are 'land'.
• 'Bridges' (=) only cross single 'river' cells, and are the sum of the two adjacent 'land' cells at each end of the 'bridge' (e.g. 2,5,3, ie: Double Arrow). Diagonal 'bridges' only cross 'river' corners.
• Dynamic Fog: Placing a correct digit will clear fog in its cell, and may also clear fog in other cells.
Hope you enjoy! 😄 - Any feedback or comments welcome!
Solution code: Column 3 (top to bottom) with dashes for river borders. (e.g. 123-4-56-789)
Comments
today, 09:32 by wuc
Brilliant 4* fog puzzle. Great setting thx.
on 17. March 2026, 19:51 by rmm466ss
Amazing puzzle.
on 13. March 2026, 18:33 by Franjo
One of the hardest FOW I’ve ever solved. But for sure one of the best, too. Thank you very much for creating and sharing this beautiful gem.
on 13. March 2026, 12:53 by Christounet
Great fun! Thanks :)
on 13. March 2026, 12:17 by Snookerfan
Sublime! At first I missed that the river can touch itself diagonally, my mistake. Great solve path, thanks!
on 13. March 2026, 10:11 by Exigus
Amazing how much could be deduced from just a couple of bridges. Thanks!
