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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 .


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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!

Thursday 19-Jun-2025

... by: Tom, France

I seem to be unable to delete unwanted numbers. For example, the 1 in J9 is redundant; the 8 in A5 also. Further, the puzzle appears to be solving itself, incorrectly. Or is it my finger trouble?

Andrew Stuart writes:
Try unchecking “auto clear”. I think that’s it

You’re not the first to ask me about this so there is something not quite right with the user interface. I’m releasing a new version tomorrow so I’m scrapping the auto clear effect on editing the candidates. That should really be just about editing the small board.

Thursday 19-Jun-2025

... by: Helper, CANADA

The Solve Path is not working

Andrew Stuart writes:
Yes sorry about that. Left a typo 's' in the code updating last night
Fixed now, [CTRL]+[F5]

Thanks for the alert

Thursday 19-Jun-2025

... by: Syd, USA

Hello! big fan of your website! Quick bug report, when getting the solve path on the sudoku solver (https://www.sudokuwiki.org/Sudoku.htm) I can see a console error "Uncaught ReferenceError: s is not defined
at HTMLInputElement.grade_sudoku1 (sud_common4.js?v=2.92:1028)". There appears to be an extra s in the function grade_sudoku1() function on 1028.

removing the s from the javascript in the dev tools fixed it right up for me!

Andrew Stuart writes:
Yes sorry about that. Fixed now, [CTRL]+[F5]
Thanks for the alert

Tuesday 10-Jun-2025

... by: joey, USA

When entering a board (for you to solve) I used to be able to type a number and it would automatically move to the next square, now it does not, I need to press right arrow. Can we go back to the old way?

Andrew Stuart writes:
Yes. Tick "Auto Tab". Recently some browsers have changed or reset how cookies are processed so a lot of saved settings have been dropped. However I can't think of a reason not to have "auto tab" on so the next patch will remove it and make it tab by default.

Thursday 5-Jun-2025

... by: ,

Hi Andrew,
The last update of the app is full of bugs :
Solution count is not working. Returns to the list of puzzles.
Hint button makes the app crash.
So it is unsable any more.

Andrew Stuart writes:
Yes. I pushed another update tonight fixing the remaining crashes so hopefully all stable now. Version 1.88

Friday 30-May-2025

... by: Timko259, USA

I have played with your newer version of sudoku now for about a month. I am not in favor of the change you made to cause me to move the cursor after entering a number. This is unnecessary. I prefer the previous method where the cursor automatically advanced to the next slot after entering a choice. This recent change is tedious and unnecessary. As one who has been using this site for a long time, please consider changing this back.

A very loyal user.

Dale

Andrew Stuart writes:
Referring to the small board number entry on the solver?
Is “Auto tab” ticked? For some reason the browsers have adopted a new policy on cookies and this may have been deleted. I hope it sticks if ticked again.

Friday 23-May-2025

... by: A random stranger, Earth

Just a heads up, the "Check" button of the sudoku player doesn't seem to work correctly (at least for custom puzzles), e.g. when you open and immediately click "Check" the player reports the nonsensical "Oops! There are -33 cells which are wrong." Happens both with the packed string and the 81-digits-variant.

Andrew Stuart writes:
Good bug report. Yes if no solution is available the check will be nonsense. Imported puzzles don't have a solution. I've updated it to v2.34 and put in a sanity check and notice. Thanks for the alert.

Tuesday 20-May-2025

... by: Peter Brown, San Diego, California

Load Sudoku:

Small feedback - As you know, when multiple chains are found in the solver, it's nice to be able to explore each one using the left and right arrows.

Sometimes, when you select the next button, the content above the arrows (describing the chain) will have more or less lines, causing the location of the next/prev chain buttons to move.

So, if I want to click through and view each chain, I can't simple keep clicking to see the next chain. I must click, view the chain, then move my mouse to find the button to view the next chain since it might have moved.

It's just a small piece of feedback that could slightly improve the user experience. One solution would be to move the chain browsing buttons above the content describing the current chain in view. That way, the dynamic content can freely change height, without effecting the location of the Next/Prev buttons.

Andrew Stuart writes:
An excellent suggestion! I have implemented it just now. Hopefully a simple page refresh will show it, otherwise [CRTL]+[F5]

Wednesday 14-May-2025

... by: Barbara H, Outside Chicago

I wrote last week complaining that the Str8ts solver loaded correctly but then turned into a completely black page after about 3 seconds. (Android tablet.) Well, that's still true but I just needed more patience. Today the black page turned back into the puzzle about 2 minutes later. Seems like a long time for the page to finish loading. But it did load!

Andrew Stuart writes:
Excellent. If anyone else, let me know

Sunday 11-May-2025

... by: PAUL DAYNES, NEW ZEALAND

I came across this one on YouTube. Your solver does not complete it and at one point the solution count is 26. However, the YouTube poster has a method that does solve it and you may like to investigate this method. https://www.youtube.com/watch?v=m9Xaa4GXs9I

Andrew Stuart writes:
Thanks Paul. I looked and an interesting strategy. I will have to add it. Not sure how useful it will be but a card in the hand for sure
Page:2025 1 2 3 4 5 :2024 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.