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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 - Either 81 numbers or the packed string version.

public - comment/question will be added to feedback column
private - email comment/question directly to Andrew Stuart, don't display here

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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 14-Aug-2025

... by: Tony Payne, United Kingdom

Hi neighbour
Is it an intended "feature" of this website that I was asked to confirm my cookie choices twice? ;o)
First on https://www.sudokuwiki.org/
Second on https://www.str8ts.com/Daily_str8ts
Didn't happen when I went back into the site

Andrew Stuart writes:
I think it's necessary now. I don’t have cross-domain cookies and the browsers don't like it when I try, so that’s where we are I'm afraid. Different sites, click again

Monday 11-Aug-2025

... by: Mark, WV

Re: 6x6 KenDoku Solver- Sample 38

Grader gives "Empty cell: E6"
Due to that the Solve Path ends up broken.
Going step by step, when it comes to E6, it takes out all numbers in D6 resulting in a "0" for the cell solution.

Andrew Stuart writes:
Thanks for the report Mark
Simplest is to delete that sample puzzle which I've now done
Refresh

Saturday 9-Aug-2025

... by: Bob, Russia

The solver page (/sudoku.aspx) is behaving in a very strange way being open on Samsung Internet browser (Galaxy S22+). Many buttons don't work at all (such as Email to a friend, Solve path etc.). Disclaimer in a box under the playfield claims to update to version 2.35 <> 2.37, while this mobile browser has neither keyboard (for Ctrl+F5) nor an option to clear specific site cashes. Please add a UI button for site update action.

Andrew Stuart writes:
Hi Bob. Yes that script should not have been there. I sometimes upload it to test but the real solver is sudoku.htm. I've deleted sudoku.aspx

Wednesday 6-Aug-2025

... by: Charp, Canada

Hi there. The st8ts main page hasn't been loading properly for me for a few days on my laptop in firefox.
https://www.str8ts.com/
Is the issue happening on your end or mine? Missing my daily asymmetrical st8ts!
Thanks

Andrew Stuart writes:
Seems okay to me. Is it persisting in not showing? Add an email address so I can reply directly.

Monday 21-Jul-2025

... by: Antonia Natale, Denver CO

Andrew: A friend of mine just showed me your Sudoku app and I really loved it. However, I have an iPad. Do you have a workaround for your app to run on Apple devices or plans to create an Apple compatible version?

Thanks!

Andrew Stuart writes:
I'm afraid I don't own a Mac and therefore can't run XCode and therefore can't create Apple Apps. The 5 Daily Puzzle app is going to get delisted soon for the same reason. Something I'd like to change , we'll have to see.

Saturday 19-Jul-2025

... by: JVic, Canada

Hello, https://www.sudokuwiki.org/Daily_Killer_Sudoku.aspx does not remember filled in entries after a refresh like it used to. Thanks.

Also, https://www.str8ts.com/Main_Page and https://www.str8ts.com/daily_str8ts should show the same puzzles, the Asymmetrical puzzle is sometimes missing from the second page.

Andrew Stuart writes:
Just checked and the entries are being saved and reloaded for me. Check your cookie caching? Daily Str8ts page hasn't had the second asymmetric puzzle for a long time. Just on the main page

Thursday 17-Jul-2025

... by: Ayumu, CN

Load Sudoku:

Hello, i found something wrong with sudoku solver.
(see link) it don't take a exocet step, but it do have one, that is base=A1,A2; crossline=c347; c-cell=B4,C7; and T-cell=B7,C4;
and another one is C8,C9,c347,A3,B4=>A4,B3=[2345];
also a double exocet is combine with these two single step.

Andrew Stuart writes:
Well done if you found one. My detection is only partial and I lack some rules - not for want of trying. Will revisit Exocet one day

Wednesday 16-Jul-2025

... by: Julia, Nederland

Please can you restrict the diabolical daily sudoku's to the diabolical strategies. It is almost rare for a diabolical daily sudoky not to require extreme strategies....

Andrew Stuart writes:
Yes it's a good time to re-evaluate the puzzle stock, the solver and strategies have moved on a bit since some of those puzzles were made. From tomorrow shouldn't be any 'extreme' strategies in the diabolicals.

Monday 14-Jul-2025

... by: Chris Wray, USA

Has the grading system changed, or has the NY Times puzzle got much easier over the last couple of weeks. I suspect the latter. Puzzles rarely dropped below 100 and Tough before, now they're regularly under 100 and Moderate or Gentle/Easy.

Andrew Stuart writes:
The NYT are not my puzzles, alas, and I don’t track them. So couldn’t comment, but maybe other people can

Monday 14-Jul-2025

... by: Clive, Oxfordshire, UK

The new cage input for Killers is difficult to use, as one can't see clearly where one has entered a cage. The underlying method of click & drag is brilliant - it's the colouring that makes it difficult to see. Could uncaged cells be grey before they are used/coloured in the normal 4-colour way; then it would be easier to see which cages still need to be defined. (or, possibly, defined cages to be outlined in bold - but that might make an enclosed area that has not yet had cages defined ambiguous) The new way of putting in the cage totals is brilliantly simple.

Andrew Stuart writes:
I've had a number of similar comments, all good ideas. I've implemented them just now
Use [CRTL]+[F5] to ensure the latest. V2.1
Using black for the selected/pained shadow instead of white
Synched the cage colours to the ones used on the solver
"Start over" now gives a blank board grey cells indicating no cage membership. Makes seeing what remains very clear.
Page:2025 1 2 3 4 5 6 7 :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.