Foggy Knight
(Published on 28. July 2023, 11:02 by Die Hard)
Normal Sudoku rules apply. The grid is covered by fog and correctly placing digits may reveal additional digits.
Each digit (except the digit in the very centre of the grid) satisfies only one of the following conditions:
- It can see the same digit (at least once) with a knight's move.
- It is in its own box (eg: 9 in box 9)
- It is the digit 5.
The digit in the very centre of the grid satisfies two conditions.
No guessing is required or allowed.
Please leave comments.
Cracking the Cryptic Solve
This puzzle was solved on CtC:
Watch the SolveSolution code: All 9 digits from row 9.
Comments
on 8. January 2024, 08:07 by Die Hard
Added link to CtC solve.
on 6. September 2023, 20:00 by OGRussHood
Another mad puzzle that forces the solver to ask mad questions.
on 6. September 2023, 06:09 by Fisherman
Thanks mse326 for your comment. Mark and Simon at CTC were also surprised by the rating. Gentlemen, control your emotions. To err is sudoku.
on 6. September 2023, 02:49 by mse326
I just want to let future solvers know, this puzzle is amazing. The rating seems to be about bugs in the software, not the logic or enjoyment of the puzzle itself. It seems the bugs are fixed so don't let the rating put you off
on 6. September 2023, 00:44 by antiknight
Cool puzzle with a nice second step!
on 5. September 2023, 23:20 by Fool on Hill
This is a well conceived, well executed and enjoyable puzzle to solve.
on 3. September 2023, 04:53 by Die Hard
Updated link now that Sudokupad bugs have been fixed.
on 4. August 2023, 06:08 by Die Hard
I have re-tested both links and on successful completion they both say "The solution is correct".
on 3. August 2023, 15:29 by Superdamicobros
Felt the frustration with the CTC app on this one. Was happy that the link to the alpha version was included. I was worried when I made it to the end and it said my solution was incorrect. Might be worth putting a note to let others know that it doesn’t check for the correct solution. Otherwise a fun ruleset, thanks for the puzzle.
on 3. August 2023, 02:26 by wenchang
Nice Foggy! Spoiler alert!
https://youtu.be/A7MdpaKxX-0
on 2. August 2023, 00:56 by Ragna
All this is quite confusing to me. Sorry.
on 1. August 2023, 14:42 by Die Hard
Added link to alpha App with bug fixes.
on 31. July 2023, 04:37 by thoughtbyte
Fun puzzle, but some of the issues with the puzzle in SudokuPad make the solve a bit frustrating. In addition to not being able to pencil mark some cells, I also couldnt place the digit in a cell once I deduced what it was since there was a given digit underneath the fog. Additionally it seems that the puzzle has an anti-knight so i had to turn off the conflict checker.
I understand the app will release an update that fixes this but perhaps using single cell cages until then would be helpful.
on 30. July 2023, 12:28 by Baklin
This was a fun one to solve. Even with the quirks in CTC with this puzzle. Working without pencil marks gave it another challenge for me. Really fun to solve one I got my head around the limits with these rules. Thanks for setting this.
on 29. July 2023, 19:00 by TempFxD
really wanted to give it a try because it started off quite enjoyable. sadly enough I cant correctly make pencil marks that dont actually reveal the solution
on 29. July 2023, 00:03 by bansalsaab
Very nice ruleset.
on 28. July 2023, 13:12 by by81996672
Fun rules, but not difficult, more people can give it a try
on 28. July 2023, 12:39 by GorgeousNicko
Interesting puzzle, on which I am still working. Two funny issues with the CTC version. One is that some cells (probably those with underlying pre-specified content)will not permit entering of pencil marks. The other is that the anti-knight constraint seems to be active (which, of course, it ought not to be).
on 28. July 2023, 12:26 by Die Hard
A can assure everyone the 2nd deduction is possible through logic (and it does not require any multi-step look-aheads). Happy hunting.
on 28. July 2023, 12:21 by Chelo
This foggy "Miracle" puzzle is one of my favorites, thank you @Die Hard for setting it!..
on 28. July 2023, 11:38 by 28righthand
Thats an interesting quirk I hadnt noticed before - you cant pencil mark a cell if it contains a number that I presume would be uncovered by fog.
