River System (v2)
(Published on 13. June 2023, 20:08 by Schorsch)
Normal Sudoku rules apply.
Each box in the grid has a height value equal to 10 times its center digit. Each cell in the grid has a height value equal to its digit + its boxes’ height.
A river system, represented by the blue lines, flows throughout the grid. After visiting a cell, the river continues downhill to the orthogonal or diagonal neighbour with the lowest height value. If none of the neighbouring cells have a lower height value than the current cell, the river instead ends in a sink, signified by a circle.
Have Fun!
Play on F-Puzzles
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There is now a second puzzle using this ruleset: Split River
Difficulty should be very similar.
Solution code: Digits from row 6 then column 7
Comments
on 12. July 2024, 21:37 by marcmees
very nice. thanks
on 3. November 2023, 22:12 by Schorsch
Fixed my abysmal german spelling :)
on 3. November 2023, 07:25 by AaronB
Great puzzle!
> Thanks!
on 11. October 2023, 23:18 by ArnulfKoch
I must have spent several hours thinking about how others could solve the puzzle. So the rules had to be right. And at some point the penny dropped and then it was a great puzzle.
> Thanks, glad you figured it out!
on 11. October 2023, 11:07 by Schorsch
Formatting, added link to german text
on 11. October 2023, 11:05 by Schorsch
Added link to new puzzle into body text
on 3. October 2023, 21:07 by lukeyy
very nice puzzle. Had the same struggle as Arnulfkoch at the beginning. but once figured out it became quite smooth.
on 20. September 2023, 18:38 by ArnulfKoch
I don't understand the rules. If the flow ends in box 3 and there is an inflow from every other box, the flow in box 1 cannot flow like this, but would have to take the red path: https://blog.arnulf-koch.de/temp/000E5X.png
Similarly in box 7.
What is it about the rules that I don't understand?
> Looks like you made an error with the centers you already filled in. Your logic afterwards is correct, the puzzle is broken if e.g. r8c2 < r9c2
on 17. September 2023, 15:19 by Prutsbeest
Not too difficult yet very nice ruleset. Thanks!
on 17. September 2023, 12:53 by Schorsch
There is now a second puzzle using this ruleset;
https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=000F6Q
Difficulty should be very similar.
on 14. June 2023, 17:15 by kublai
Figured it out... that wall felt really familiar. I bet it was the same one I banged my head against repeatedly last time.
on 14. June 2023, 13:47 by Steven R
Good fun, glad you got it sorted out :)
on 14. June 2023, 10:10 by MonsieurTRISTE
An end point without a circle must be a source.
on 14. June 2023, 08:58 by Torvelo
How can I know which way the river is flowing? Or is figuring that out a part of the puzzle?
on 14. June 2023, 03:18 by Jlrice2
I am glad you got the puzzle reworked. I remember the first one and how I was frustrated with it trying to figure out how to get it to work for an hour before realizing it was taken down
on 13. June 2023, 23:59 by RJBlarmo
Neat idea, fun approachable puzzle!
on 13. June 2023, 20:04 by Schorsch
This is a revision of a puzzle published on may 4th.
Special thanks to Steven R, marty_sears, StefanSch and TomMalufe who played and commented on the original, pointing out an oversight which made the puzzle unsolvable.
<3
