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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 - 81 characters, use '.' or '0' for unknowns.

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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!

Friday 16-Aug-2024

... by: Donin, Michigan

was curious if you would be willing to add a solver for Percent Sudoku?

i've been using an android app for sudoku called Andoku 2 which has a few different game modes like X, hyper(windoku), percent, color, and squiggly(jigsaw), noticing you already had solvers for most of these already
i've been getting stuck on the Extreme difficulty ones from this app sometimes, with a lot of them requiring more than a couple XY-chains and possibly other diabolical strategies

i took a liking to percent sudoku as it's basically a half/half combo of X and windoku

really been loving using your solver to just help with that "next step" i needed to find in some of the regular sudokus i've played, great website, feels better than all the others i've tried

i can send/email examples of a few of the ones i've been getting stuck on if needed

Andrew Stuart writes:

Yes that should be pretty easy to set up. I'm currently working on Jigsaw Killer Sudoku solver and player, but when I'm done...

Saturday 10-Aug-2024

... by: john, us

Can import today for some reason??

Andrew Stuart writes:

Need a bit more info. From where to where?

Tuesday 6-Aug-2024

... by: Robert Maier, Los Angeles

This is just a notification of a possible IOS version compatibility issue. I still use IOS 12.5.7 on an iPad and recently observed the Sudoku Solver no longer populates the main grid with values of any kind, The problem appears using either Chrome or Safari to access your site. This problem does not affect another iPad running IOS 17.6 or a Linux box running Chrome. I assume it merely reflects the gradual loss of function associated with the older device/version combinations and I don't expect you to do anything about it. Your site is an excellent resource.

Andrew Stuart writes:

That's sad to know. I recently bought an old second hand ipad to test on. That has iOS 15.1 and I've been able to check everything works on that. If I had access to more resources I'd buy one of those subs to a site where every old browser can be spun up in a virtual machine. Getting reports from people not able to see the Daily Killer since I've started to use a more modern version of javascript (ES6 and not ES5). Should be able to do a work around I hope.

Tuesday 6-Aug-2024

... by: Nigel, UK

Your Sudoku solver no longer works with Firefox 52.9.0 ESR (the latest version that works on 32-bit windows). It used to start up with a default puzzle, now it's just blank. Typing in the numbers is different and autotab no longer works. Then, having typed in the puzzle I need help with, 'Take Step' does nothing. I presume this is since your July 2024 update. Is there any chance of Firefox 52.9.0 compatibility again, for people like me who are stuck on 32-bit windows.

Andrew Stuart writes:

So I was able to download that exact version and just install it and check for myself. Makes it sooo much easier. I’ve had other reports that the new Daily Killer isn’t working and I found I needed to remove one javascript modern item and it works fine now. And that code is the all ES6 javascipt. Looking at the Sudoku Solver I see some class initialisers could be changed. That makes the solver work but no luck with the solution count. So this Firefox doesn’t like the WASM wrapper for the new solution count but I’ve by-passed it to make the grader and solve path work. A number of CSS issues I see but will fix later. Let me know how pages look now [CRTL]+[F5] if not immediate

Sunday 4-Aug-2024

... by: jp, Australia

Load Sudoku: CLICK TO LOAD

It gives the clue (naked quad, h7!=3) but remains stuck on Wait.
Also, it repeats endlessly:
Sorry, you didn't get the security code correct, please try again

Andrew Stuart writes:

Might have been when I was restarting the service. Or just very busy. Loaded the puzzle and works for me this morning. Extreme, so took a while.

Friday 2-Aug-2024

... by: Nada Savatic, US

When I try to clear the board to create a new puzzle (start over button), the killer cell lines are deleted, but the numbers remain. Have to manually erase all numbers

Andrew Stuart writes:

I think this is fixed now. Do let me know if not.

Thursday 1-Aug-2024

... by: Paul, Germany

Load Sudoku: CLICK TO LOAD

Greetings!

[This] has, at step 1, four naked pairs. However, in the Solve Path you list seven naked pairs: one is listed in column 7(A,B) and also in box 3; another is listed in column 1(E,F) and also in box 4; and so on. In other words, three out of the four naked pairs are shown in the Solve Path twice: once in a column and once in a box. I hesitate to say that this is wrong, but could perhaps the Solve Path listing be optimised so that it eliminates double entries?

TIA, Paul

Andrew Stuart writes:

That’s a fascinating example and quite insane. Pairs usually don’t stack up quite like this and it usually isn’t a problem. I feel I have to show all examples in one round otherwise the take step could get tedious. In this case I can see that finer steps would be better. The thing is I save all the eliminations until the strategy is finished to avoid knock-on effects. I feel I might introduce bugs if I make a complicated filter for this edge case

Wednesday 31-Jul-2024

... by: rocky, earth

I tried the 6x6 KenDoku® Solver. When I edit the candidates, they disappear and cannot enter again. Can you pls check this? Thanks

Andrew Stuart writes:

Fixed! Undeclared variable. Oops. Refresh the page

Monday 29-Jul-2024

... by: Lincoln Kinnicutt, Boston

For the past several days, the jigsaw solver does not work. Cannot load an Archived or imported Sudoku into it.

Thanks.

Andrew Stuart writes:

Ok fixed this now! Tough one but got there

Saturday 27-Jul-2024

... by: Carl in 't Veld, The Netherlands

I use your fantastic site a lot to continuously learn new sudoku tricks. I wonder if you are planning a mobile friendly version?

Andrew Stuart writes:

I’ve tried! I really tried to make the site work on Mobile. The puzzle players seem to be decent enough. Okay I’ve not tried to make the solver work on mobile – it is just too big. I was hoping people would use the Android App but sales are slight. I will attempt a small solver version for mobile in the near future. But have to consider if it will pay for the costs. Is something I’d like to do. Maybe a supporters only feature

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Thank-you everyone for all your questions and contributions.