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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 - 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 13-May-2022

... by: James Leonard, USA

The archived Sunday puzzles for May 01 and May 08 are blank and the date shown for them is December 30 1899 ! Cheers.

Andrew Stuart writes:

Thanks for the alert. Looks like I uploaded new stock for all the grades except the Sunday extremes. I've put them up now, have a look


Sunday 8-May-2022

... by: David Andrew, England

It's happened again! Just like last Sunday, the Extreme Daily Sudoku is blank. I have Javascript enabled on my Mac, and the other puzzles, including the Extremes for April and before, are all fine.

Andrew Stuart writes:

I've put them up now, have a look. Sorry about the delay!

Saturday 1-Jan-2022

... by: Jeff Sussman, new sudoku user

Love your work. Very helpful. Have yet to find one you can't handle.
Q: Can a user paste an entire Sudoku directly into the small board?
(I'm keeping a list of them in Excel with comments and it'd be great if I can copy/paste back into the small board later.)

Andrew Stuart writes:

Not in a 9x9 square shape, no. I can see the utility of that, but if you are working in excel, should be easy to concatenate the numbers into a cell so they are all in a line. You can even add the prefix

to the start of the cell to get a direct link from excel to the solver
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