Solver App for Android
Strategies for Popular Number Puzzles
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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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Many thanks to all the people who have helped improve the solvers and strategies with their feedback!

Saturday 20-Jul-2024

... by: chris, Scotland

Your Send To Solver button isn't working.

Andrew Stuart writes:
Beg your pardon, didn’t upload all the updated files last night
[CRTL]+[F5] and refresh. Should work now

Saturday 20-Jul-2024

... by: Dan, United States

killer Sudoku not loading

Andrew Stuart writes:
Beg your pardon, didn’t upload all the updated files last night
[CRTL]+[F5] and refresh. Should work now

Monday 15-Jul-2024

... by: Graham, UK

I am trying to print off todays daily sudoku on a computer and it is not formatting correctly. It looks as though it may have been formatted for a phone or ipad. I also tried ones from last week that formatted OK when I printed them off last week but now are scrunched. The Killer doesn't seem to be affected and formats correctly!

Andrew Stuart writes:
I figured it out. I was testing the [Print] button on the player
I forgot there is a print link at the top of the page. Working now

Wednesday 10-Jul-2024

... by: Phil Salisbury, United States

How do I print The Sudoku Solve Path dark enough to read/?

Andrew Stuart writes:
Taking about the output file?
That's a good point, not tested it for printing. I see it needed some "@media print" CSS
Try now

Monday 8-Jul-2024

... by: Romy Boreiko, Canada

As of today (2024-07-08) your KenKen program does not enter any numbers at all, neither the given nor the possible ones. The only time any numbers are filled in is using the Step function, but all you get are the one single answer number. The whole thing is pretty useless at this time.

Andrew Stuart writes:
My apologies, it was so obvious. Can't see the wood for the trees sometimes
White digits! Seems the page was working in "quirks mode". I've fixed it up now
I do intend to give the 6x6 solvers some love very soon. Quite old code in there and almost finished with the 9x9s now

[CRTL]+[F5] to refresh if it doesn’t work automatically

Monday 8-Jul-2024

... by: GT, Canada and I believe are supposed to show the same two puzzles but the second page often only shows one puzzle. I think later in the day it often shows the second puzzle. Not sure if this is intentional.

Andrew Stuart writes:
The Daily Str8ts page has only the main symmetrical Str8ts puzzle. The Main Page has two puzzles. Both invoke the same player with the same parameters so they must be the same. Write to me if you see a difference and I'll investigate.

Monday 8-Jul-2024

... by: Joel, USA

Hi! Great solver here but I recently started playing a slightly different version of Killer Sudoku where the number within each 3x3 square don’t have to add up to 45…only the rows do. For example, R1C1 and R2C3 could have the same # even if they are in that same top left grid. Would be great if there was a way to solve these types too.

Andrew Stuart writes:
That reminds me of KenKen but with the difference that all the operators are addition. That is a valid but unusual setup for KenKen but it doesn’t use the 3x3 boxes.

Sunday 7-Jul-2024

... by: Jan, Germany

In the solver, trying to edit candidates leads to an x/y NaN, which makes the solver unuseable. Chrome 126.0

Andrew Stuart writes:
Thanks! Should be fixed now

Friday 5-Jul-2024

... by: Ivydoom, Europe

Just found your solver. I absolutely appreciate the step-by-step solving so I can actually learn how to get better instead of simply looking op a solution. So just thanks!

Andrew Stuart writes:
Fantastic and thanks for the feedback!

Thursday 4-Jul-2024

... by: Tom, France

Is it my finger trouble, or have you stopped supplying strong link data on simple colouring checks?

Andrew Stuart writes:
Fixed now, refresh. Yes something I was fixing yesterday caused me to delete something I shouldn't have. There's a reason I don't work on nuclear reactor code ;)
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Thank-you everyone for all your questions and contributions.