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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Any Sudoku you want to publish here for easy loading into the solver - 81 characters, use '.' or '0' for unknowns.

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Many thanks to all the people who have helped improve the solvers and strategies with their feedback!

Friday 17-Feb-2023

... by: Nabl, Netherlands

Load Puzzle

There is a X wing in this puzzle for 4s. It is not recognized

Andrew Stuart writes:
Can't see it. More details?

Friday 3-Feb-2023

... by: Béryl, France

Hello! I've discovered your site a week ago and I love it! I've been trying to use it to teach myself how to learn methods. I want to enter possibilities by myself and only when stuck use the solver. However when I enter only one possibility in a cell, it shows up as the answer for the cell. I work number by number in all the grid and not cell by cell so it's just temporary to have one possibility, i'll write others when I'll search for other numbers. Is there anyway that I haven't found yet or is it just not the right logic to solve Sudoku? Thank you for you help!

Andrew Stuart writes:
The solver needs to control the candidate spread if you are using "Take step"
I suggest you use "Player >" to send the puzzle to the player which does allow candidate editing
And if you get stuck "send to solver"
The solver will still ignore your candidates since it needs all logically present ones, not just the ones important to you. But you can step from that point to discover the strategy

Tuesday 31-Jan-2023

... by: Angelika, Germany

Hallo again,
Sorry, I need help again:
When I want to print a str8ts puzzle, the black squares are not there. How can a get them?
Thanks and have a nice day.

Andrew Stuart writes:
When you get the printer choice dialog box - tick "Print Background-images" in the print options.

Tuesday 24-Jan-2023

... by: Mary Clark, Canada

FYI, I just completed the Daily Str8ts and filled in all the cells but I had a mistake. No error messages came up. I fixed the cell and then got the Congrats message.
In the previous version, as soon as all the cells were filled in, the number of errors would be reported.

Andrew Stuart writes:
Doh! Yes there was a typo in the code. Fixed now, version 2.15
Many thanks for letting me know, appreciated

Monday 16-Jan-2023

... by: Terje, Norway

Reported a bug on sheet. Seems to work normal again. Love this sheet and have used it for years loading hard puzzles and doing step 1 and 2 before printing.

Andrew Stuart writes:
No clear what page you are referring to. I was just now fixing something on the sudoku player which might have broken it for 10 minutes. Also - please send email so I can respond directly

Friday 13-Jan-2023

... by: Rex Welsh, Ontario, Canada

Load Sudoku:

Hello Andrew

I want to thank you for all the work you did in building this site.

I wanted to mention that the box that changes with the steps that explains why some choices were made does not advance to the next explanation. I had hoped that others would have mentioned this to you.

On another topic, I saved the string :

It does not matter what it actually is but I found no way to plug this in so that I could try the puzzle another time. I do see one above but that goes to you and not the main panel.

Thank you again for all the work you have done to help me learn more about this game.

Rex (It's my real name)

Andrew Stuart writes:
To create a perma-link to a puzzle use the "Email This Board" button, creates this link (from your definition):

If you mean the blue results box below the solver board then yes it only updates when there is something returned to the solver. So steps that merely clear off candidates or set solved cells don’t generate text to put in that box. I guess it's a minor thing but sometimes I think its better to keep it since people may move forward but still want to refer back to the text.

Thursday 12-Jan-2023

... by: Bill Campbell, Williamsburg, Virginia 23188 United States of America

How can I simply move a Sudoku puzzle from Daily to Sudoku Solver without losing my entries?

Andrew Stuart writes:
Hi Bill. The Daily Sudoku has a button "+ Solved Cells" which will transfer your progress. However it doesn't make sense to transfer the candidates you entered. The solver needs all the candidates logically available so it will override your fewer entries.

Thursday 12-Jan-2023

... by: Barbara, Germany

Dear Andrew Stuart,
Since years I loved to play str8ts nearly every day. But now the keyboard covers the riddle while writing and I had to scroll up and down all the time. And so I have no clear view. It's an Android mobile phone.
Can you help me? I would be sad If I could not solve your str8ts any more.

Andrew Stuart writes:
Not good, love to fix.
To anyone with similar issues - please send me a screen shot? with the keyboard showing would be great. So many devices and screens I'm mostly guessing how it looks for most people despite having my own android phone. I added a checkbox on the player "Numeric keypad". Does that help? Suspect it takes the same space
Thinking of adding my own keyboard popup

Thursday 5-Jan-2023

... by: John, Texas

Exact same problem as Kath, Canada, except I'm on an android device,

Also, until the recent changes i used to get a full keyboard to use in str8ts, which was useful for making corrections... now just get a minimal numeric keypad

Andrew Stuart writes:
Ok I'm going to put an option on the player
When I use Android with the default keyboard the numbers are not shown, you have to SHIFT to see them

Thursday 5-Jan-2023

... by: Harry, Niederland

Fruher kamen die kleine ziffern auf ein linie.Die neu methode ist meer verwirrend Absolut klein verbesserung

Andrew Stuart writes:
Look for the "Notes 3x3" and untick
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Thank-you everyone for all your questions and contributions.