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Feedback and Questions

I've received a lot of interesting comments and questions from Sudoku fans over the last few years and this page is where I try to answer them. I'm also directing Str8ts feedback here. Please feel free to drop me a note on the side of the page. Or you can email me directly at .


Post a Comment or Question here...
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Any Sudoku you want to publish here for easy loading into the solver - 81 characters, use '.' or '0' for unknowns.

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If you are writing to alert me of a problem (thank-you!) please include a url to the page in question.
Can get fixes in quicker if I know immediately where to go.
Many thanks to all the people who have helped improve the solvers and strategies with their feedback!

Tuesday 19-Nov-2024

... by: Paul, Canada

Load Sudoku:

In the partially solved puzzle above the step is a 3D Medusa, producing this output:

3D Medusa

(RULE 5): Uncoloured candidate 2 in E6 can see coloured 2 elsewhere and an oppositely coloured 4 in its own cell. It can be removed.

In the solver the 2 in E6 was coloured not uncoloured. Perhaps, should have coloured the 2 in E5 instead?.

Andrew Stuart writes:
Hard to tell if the 2 in E6 was coloured – you can make a case for it if you trace the chains manually but lets say it was a colour. If it was blue then we’d have two blue numbers in the same cell. A no-no. If it was green we’d have two green candidates in the row. Also a no-no. So it doesn’t really matter. Its about the 4 in E6 and the 2 in G6

Tuesday 19-Nov-2024

... by: Robin Hall, England

Hi, I’ve suddenly encountered a problem I haven’t had before , when pasting in a 81 long string for the importing a Sudoku nothing happens. I have been doing this for a couple of years without any issue but suddenly the import doesn’t work, this is on iOS, I haven’t tried on a widows computer?

Andrew Stuart writes:
I figured out the issues with Import this morning. Missing brackets. 2.28.3, let me know how that goes for you

Monday 18-Nov-2024

... by: Jayalakshmi Vidyashankar, India

hI
The "Import a Sudoku" tab is not functioning at https://www.sudokuwiki.org/Sudoku.htm
Please set it right
thanks
jayaa

Andrew Stuart writes:
I created some bugs in 2.28 but hoping they are gone now. Can you [CRTL]+[F5] in case you need to refresh manually. Does the import problem persist? Working for me this morning

Monday 18-Nov-2024

... by: Gary Lee Jones, usa

Load Jigsaw">
solution count... comes up with a kind of error msg, input string too long and no result, so something else is wrong\ sorry

Andrew Stuart writes:
yes was a bug with changing the dots into zeros. Updated to 2.28.4 on the Jigsaw Solver

Sunday 17-Nov-2024

... by: Andrew Reid, West Sussex

An issue has suddenly appeared when my blog links to your solver. It seems to be dropping the first digit of each puzzle.
You can see what I mean here:
https://andrewspuzzles.blogspot.com/2024/11/sudoku-no-736-extreme.html

Andrew Stuart writes:
Yes sorry I broke it fixing an issue with printing and then broke the fix. Try again now. Appreciate the report

Sunday 17-Nov-2024

... by: Edwin P. McCravy, USA SC

Did you intend to change the printing of the solver so that we are forced to have "123456789" at the top of each empty cell? I would much prefer not have them, but I can find no way to eliminate them when printing. Can you make it an option?

Andrew Stuart writes:
That is an oversight of mine. The candidates "shown" checkbox was not being used. Untick to not print candidates

Saturday 16-Nov-2024

... by: richard allen, CANADA

Starting today, pressing Print 1 or Print 2, results in the same output, which used to be the Print 2 output for the Sudoku Solver.

Andrew Stuart writes:
okay thanks for the report. Fixed. Might need to press [CRTL]+[F5] on the print page

Saturday 9-Nov-2024

... by: John V Lundberg, USA/Georgia

Hi,
Are you aware that if you try to print one of the daily Sudoku puzzles, it always prints puzzle # 4?
https://www.sudokuwiki.org/Daily_Sudoku
John Lundberg
Lund5@infionline.net

Andrew Stuart writes:
Fixed this now! Thanks for the report. Yes was a change recently where I opened all grades. Thought I’d tested the print.

Friday 1-Nov-2024

... by: Jonathan Stannett, UK

I've been using your Killer solver as a training tool for myself over the last 3-4 years. Thank you very much for such a great tool.

I've solved a few Deadly puzzles from The Times newspaper, but the one from 23/10/24 No 9745. has beaten me. I put it into your solver and it reported "Run out of known strategies." without having solved any cells.
Does this tool have any techniques to fault find puzzles, as I believe that two at least cages have been given the wrong totals.

Andrew Stuart writes:
Send it to me and I'll take a look. Use [Email This Board]

Saturday 19-Oct-2024

... by: Karwan N, Sweden

Hi!

Thanks for all the guides and for the solver.

I've been starting to play some of the daily sudokus and I usually like to place all 1-9 notes on each cell and then manually delete notes as I discard possibilities. Is it possible to insert all digits into each cell in quick succession?

Andrew Stuart writes:
This is a good idea. I recently added that feature to Killer Sudoku, so I will do the same for Sudoku
Page:2024 1 2 3 4 5 6 7 8 9 10 11 12 :2023 2022 2021 2020 2019 2018 2017
2015 2014 2013 2012 2011 2010 2009 2008 2007 2006
Thank-you everyone for all your questions and contributions.