==== LINKS ====
F-puzzles -
SudokuPad
==== RULES ====
Normal Sudoku rules apply : fill the grid with digits 1 to 9 appearing each in every row, column and 3x3 box.
Inequality signs : an inequality sign across two cells points to the one containing the lower digit.
Renbans : along a renban line appear consecutive digits, not necessarily in order, but with no repeats.
German Whispers : along a german whisper line, adjacent digits must differ by at least 5.
Renber Whispan : A grey line is either a renban or a german whisper.
===============
Thanks to Henry Pi James for testing and providing precious feedback !
Solution code: Digits from Column 3 (top to bottom) followed by Row 1 (left to right). 18 digits, no space character.
on 5. July 2024, 23:59 by snuuba
Mindbendingly difficult for me, probably the hardest puzzle I’ve ever solved, but after several hours managed to do it, probably missed a trick or two.
Below is CTC link with solution included, so one can check their logic / progress if so inclined.
https://sudokupad.app/dpbtba8yz0
on 22. September 2023, 13:17 by wullemuus
The break-in really wasn't easy and needed some attempts. After that it solved really fast. Elegant construction!
on 21. September 2023, 14:12 by wullemuus
Just for clarification: Are the little attached lines (e.g. r3c1-r4c1, r3c5- r4c5 and so on) strictly part of the renber whispan in box1/2 or can these lines be something else?
Sktx @wullemuus : they are part of the whole grey line they are connected to, in other terms there are no touching lines in the grid. So if it connects, it's the same renber whispan line.
on 30. August 2023, 01:48 by RedBarchetta
I think that depends on the solver. What is average for me is likely easy for another. I have been solving for just two years now - and if I can't solve it, it's a 5 for me. I think 4 is fair.
on 29. August 2023, 07:15 by RedBarchetta
Two and one-half hours later and what a payoff! Your puzzle is incredibly challenging and highly rewarding. It was fun to apply "if this then that" and just grind it through. I had so many colors, pencils marks, pairs, and other notes that when I finally got the first digit it solved immediately. Great puzzle, thanks!
Sktx @RedBarchetta : Thanks a lot for taking the time to get through it, and I'm really hppy the solve gave you some satisfaction. Do you think I should maybe change the difficulty estimate to 5 stars ?