Mostly Harmless
(Published on 11. April 2026, 05:47 by AaronH)
Arthur followed Ford's finger, and saw where it was pointing. For a moment it still didn't register, then his mind nearly blew up. "What? Harmless? Is that all it's got to say? Harmless! One word!" - The Hitch Hiker's Guide to the Galaxy
Rules
Normal sudoku rules apply: fill the grid with digits 1–9 so that no digit repeats in any row, column, or 3×3 box.
All variant clues follow their standard meanings; full descriptions are provided below.
- Dynamic Fog: The grid is covered with fog; entering correct digits may clear fog elsewhere, and no guessing is required. Any lines or markings continue and connect beneath fog. Unless revealed, no additional clues should be assumed to exist under the fog.
- Kropki Dots: A black dot indicates one digit is exactly double the other, while a white dot indicates the digits differ by 1.
- X / V Sums: An X between orthogonally adjacent cells indicates the digits sum to 10, and a V indicates the digits sum to 5.
- German Whispers: Along a green line, adjacent digits differ by at least 5.
- Modular Line: Along a teal line, any three adjacent digits must include one digit from each of the modulo‑3 sets {1,4,7}, {2,5,8}, and {3,6,9}.
- Nabner Line: A yellow line cannot contain two digits anywhere on the line that are consecutive.
- Maximum Cells: Cells indicated by greater‑than symbols, must contain a digit greater than all of its orthogonally adjacent neighbours.
Walkthrough Video | Live Solve Video by Logic Lemur Gaming
Primary Phase
- Fit the First - Mostly Harmless <-- You are here
- Fit the Second - Mostly Harmless: Know where your towel is
- Fit the Third - Mostly Harmless: Zaphod Beeblebrox
- Fit the Fourth - Mostly Harmless: Hyperspace Bypass
- Fit the Fifth - Mostly Harmless: Beware of the Leopard
- Fit the Sixth - Mostly Harmless: Heart of Gold
Secondary Phase airing later this year with Mostly Harmless: Babelfish...
Solution code: Row 3 - left to right
Comments
on 9. July 2026, 20:27 by AaronH
Added link to Live Solve Video. Thanks Logic Lemur Gaming
on 9. July 2026, 18:30 by sencha
Would have loved if the maximum cell fog was cleared at the end for a more a pleasant solve, but great puzzle nonetheless!
on 15. June 2026, 06:51 by fredgruff
The number of comments, coupled with the points they’re making show it’s definitely not a 1-star!
on 5. June 2026, 00:31 by Sudokujoker
Nice puzzle! Also just wanted to thank @Narayana for linking to my puzzle - thank you!
on 24. May 2026, 19:01 by itsid
indeed, took me a minute to figure out the end as well...
Sure, reading the rules helped, seeing what is indeed missing and such, but it's not as low hanging of a fruit as the rest has been... still a very beautiful puzzle
on 23. May 2026, 08:55 by Narayana
Aaron: Take a look at this puzzle:
https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=000SY6
Not by me. It is a very nice puzzle that needs more solves and has a Hitch Hiker's theme.
on 30. April 2026, 08:55 by AaronH
Added link to walkthrough
on 24. April 2026, 22:18 by chotoro
Yep, no guessing needed, but I can understand the struggle with the last step. I had to bifurcate a bit to figure out the technique I was missing.
on 24. April 2026, 21:58 by QuozBat
This does solve uniquely without making assumptions on contents of the fog.
on 20. April 2026, 16:57 by KingIsulgard
11:22 For me. R7C2 and R7C3 are ambigous, there's no hint how they should collapse. Had to guess. The maximum hint showed up too late for me.
on 14. April 2026, 03:58 by mbumbee
This is a great puzzle, the last thing is a little hard to spot but not THAT hard!
on 13. April 2026, 19:25 by puppyvardy24
great !!
on 13. April 2026, 12:03 by BG03
This puzzle was mostly harmless. And mostly 1 star difficulty :)
on 12. April 2026, 01:18 by PixelPenguin
I"m stuck with a few boxes on the left side of the puzzle. Probably something obvious I'm missing. Haven't seen the maximum rule pop up yet.
on 11. April 2026, 18:06 by JVA
Thanks for the "standard rules" line, btw
on 11. April 2026, 13:19 by bloodhovnds
this was a really nice puzzle, thank you!
on 11. April 2026, 11:02 by Fool on Hill
I think this solves fine as it is - I put a hidden comment on my final resolution.
on 11. April 2026, 10:15 by JoeyJoeJoe
00:44:51 for me.
