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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 andrew@str8ts.com.

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.

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Comment, question or feedback:

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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!

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: CLICK TO LOAD

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.

Saturday 12-Jul-2025

... by: Dave, Usa

There is a problem! Once I edit candidates and try to use solver, it puts back the candidates I edited out. This has been happening for about a month. Before that it was fine.

Andrew Stuart writes:

Uncheck "Auto clear". The browsers have changed how cookies are saved, this setting may not stick or has come unstuck

Tuesday 8-Jul-2025

... by: George Heppolette, United Kingdom

Sorry but I cannot create my own killer sudokus with your new version. I cannot construct cages or enter cage values on my Chromebook. Any suggestions please.

Andrew Stuart writes:

I don’t have a chromebook to test unfortunately but I have tested on similar devices. Are you seeing v1.9 in the lower left corner? Do you have a keyboard to refresh the page with [CRTR]+[F5]
I found a video on accessing function keys
https://youtu.be/8mpbdd6nIws
Lets start with that

Saturday 5-Jul-2025

... by: romboc, Canada

Sorry, but this version is still a royal pain. Your version from three days ago was much better and something I liked. The latest version does NOT cancel out the previous entries from a puzzle, but rather it tries to revert to it as one starts to enter new information, constantly and repeatedly, both using the new "Paint" option as well as the old "click on the border" approach. No idea why, but frequently the new number and operand disappear and have to be reentered, sometimes several times!

Andrew Stuart writes:

I have duplicated that on my ipad. Can you confirm what device you are using?
Not duplicating it on PC so must be some Apple/Safari difference and there is no debugger on iPad

I think I’m going to have to separate the cage making from the clue entering and make it a user selection
Just too difficult with fat fingers on an ipad to try and do both at the same time

Will update as soon as

Friday 4-Jul-2025

... by: Laura, Canada

The killer sudoku solver (https://www.sudokuwiki.org/KillerSudoku.aspx) is not allowing me to enter anything. Not sure if it is an issue with my computer or the website. I honestly preferred the borders because I could use those on my phone.

Andrew Stuart writes:

Yes it doesn't work on some devices or poorly. I thought it was perfectly fine on desktop. This morning I updated the 6x6 forgetting the 9x9 uses the same code so probably broke the 9x9. As I have guests at the moment it might be a tonight or the morning before I can figure it out

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Thank-you everyone for all your questions and contributions.