Unique Under the Fog 4.0
(Published on 12. May 2025, 09:06 by Visumation)
Rules:
Normal sudoku rules apply.
Neighbouring digits on an orange Dutch Whisper line must have a difference of at least 4. (DW)
Neighbouring digits on a green German Whisper must have a difference of at least 5. (GW)
Along purple zipper lines, pairs of digits equidistant from the center of the line have the same sum. On odd-length zipper lines, this sum is the value of the digit in the central position. (Z)
Digits in a cage may not repeat and must sum to the clue in the top left of that cage (if given).
Digits on an arrow sum to the digit in that arrows circle.
Each constraint type may contain no repeated digits anywhere in this puzzle. Eg. If one renban line contains a 5, then no other renban line may contain a 5.
Additionally the grid is partially covered in fog. Placing a correct digit may clear fog in somewhere in the grid.
Solution code: Row 5
Comments
on 7. July 2025, 05:05 by PancakePie
Wow! Once I unlocked the break-in, it was a feast of twists and turns. Very fun! But proved a bit harder than 3 stars over here.
on 4. June 2025, 15:59 by Galc127
Great puzzle and amazing construction.
The break-in(s) was beautiful and I agree it should be more than 3*, maybe 3.5*.
I haven't tried all your puzzles yet, but this is one of my favourites
Thanks.
on 27. May 2025, 19:03 by ostio456
Blimey. That was one hell of a challenge. The way all the different constraints interacted was just magical. Trying to work it out is hard enough, but discovering these interactions and making a puzzle is something else. Well done and thank you for setting
Thank you very much for all your kind words. Really appreciated. Happy you enjoyed the puzzle. Try the other ones in the series if you haven’t. They are not as hard as this…;) /vis
on 20. May 2025, 17:43 by wuc
Masterpiece. Wow that break in was awesome. From my solve time rather 4* to me. Great great fun thx.
Thanks a lot. Yes I think it is 4* as well. Accidentially uploaded without changing…;). /vis
on 19. May 2025, 22:45 by ninjamunk
I spent an ungodly amount of time on this, but managed in the end! Very happy I stuck with it.
Really well done. Its not an easy puzzle. Really glad you managed it. Thanks. /vis
on 19. May 2025, 00:33 by Jorrr2
Very nice! But 3 stars? Can we give it one more? :)
Yeah. Maybe. You guys be the judge. The break-in is probably 4. Thanks. /vis
on 14. May 2025, 03:56 by abihummel
I don't normally attempt 3* puzzles, but I have solved this whole series and would gladly solve 100 more. This combination of constraints is extremely satisfying. Please keep them coming!!! :)
on 13. May 2025, 21:54 by Sparky
Waw, this was very hard for me (I usually go for 1/2*) but it was so worth the time. Hardest fog I've done but probably most satisfying one too, thank you so much for submitting !
Great. Happy you stuck with it. Well done. /vis
on 13. May 2025, 13:46 by da-hans
Very nice. Maybe I missed a key deduction. The first digits came up not that easy.
They are not that easy. You probably took the intended path. Thanks for solving. /vis
on 12. May 2025, 23:11 by VicJameson
This is a great rule set that makes for some equally great puzzles. They really get me thinking. Thanks.
Thanks for solving. And your kind comment. /vis
on 12. May 2025, 21:52 by madhupt
Wonderful puzzle! Not easy but a very satisfying solve. Thanks for sharing.
Wasn’t meant to be easy.thanks a lot for putting in the the time and effort. /vis
on 12. May 2025, 21:37 by cam
Very fun puzzle :)
Thanks a lot.. /vis
on 12. May 2025, 21:14 by VitP
and let us express our appreciation for putting in the extra effort to identify the lines with letters.
Thanks. Chinstrap is the person to thank for that though.
on 12. May 2025, 18:25 by madhupt
Wonderful puzzle! Not easy but a very satisfying solve. Thanks for sharing.
Thanks. Much appreciated. /vis
on 12. May 2025, 17:53 by Franjo
For me it was very tricky to get started (it’s so easy to overlook something important), but surely this is one of the best FoW I ever solved! Thank you very much for creating and sharing this masterpiece.
Thank you very much for your kind comment.
Weird the rating suddenly dropped from 100 to 93.
Guess someone else really hated it. Really glad you enjoyed it though. /vis
on 12. May 2025, 13:23 by Snookerfan
Brilliant! Thank you
Thank you. /vis
on 12. May 2025, 13:08 by Myfyr MJ
Nice puzzle but very difficult.
Thanks.
on 12. May 2025, 12:07 by AngusWBA
Great puzzle, thanks!
Thanks a lot. Glad you enjoyed it. /vis
on 12. May 2025, 10:10 by rameshsrivats
Terrific, as always
Thanks a lot. Happy you liked it, /vis
