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!

Friday 22-Jun-2012

... by: Deb H, USA

I found an instance today -- first time I've noticed it -- that when I used the auto clear function, the deletions that I had made individually were lost. When I removed the auto clear function all worked properly.

Andrew Stuart writes:

I think you'll want 'Auto Clear' off if you manually edit the small board. It does refresh the whole board with the clues and solutions entered.

Wednesday 20-Jun-2012

... by: Mat, us


start with escargot. put 3 in cell H5. Step through solver until solver uses pattern overlay for first time. It solves correctly to eliminate three 6s, but the yellow fields seem to show pattern for 9s

later it will solve for 8s and it works fine.


Andrew Stuart writes:

Extremely well spotted, nice catch. I've updated the solver under the hood and its now highlighting the correct cells in yellow. Thanks for writing in

Monday 18-Jun-2012

... by: Alain, France

hi, is there a file containing the sudoks techniques you explain on your site ? Thanks Alain.

Andrew Stuart writes:

Not sure what you mean by file...but I am intending to publish an ebook with the site contents and lot more. You'll the announcements on the site when that goes live

Thursday 14-Jun-2012

... by: Robert, USA

congratulations! just bought the IPAD app 5 daily puzzles and have not had time to play any games yet but it looks like a winner!

Andrew Stuart writes:

Thanks Robert. Hope you are having fun!

Monday 11-Jun-2012

... by: pomahony2, Richardson, TX 75081 USA

Mr. Stuart,
I have your book, I just wanted to say "Thank You" for shareing your knowledge with us.
I apprecialte the book and the web-site.
Pat OMahony

Andrew Stuart writes:

Hi Pat

Really glad you like the book and the website, you're most welcome. Thanks for dropping me a note!

Sunday 3-Jun-2012

... by: Katrina, Canada

Love the site, I was doing Sudoku's in the newspaper, and now, when I am stumped, I load them into this site. I've mastered a few techniques. thank you!

Friday 1-Jun-2012

... by: John Oursler, USA

Why are all the possibles shown when I put in a puzzle to print out? I used to do this and the squares were empty where there no numbers and I could use my on system(I try to get to only 2 or 3 possibles before I write them in. Is there a way to clear the possibles before I print the puzzle? Thanks for this great web site.

Andrew Stuart writes:

Untick "Show Candidates"

I'll look at reverting to the old system for this one aspect but it gets complicated with the new features I've added especially the auto saving

Tuesday 29-May-2012

... by: BT Bost, US

What happened to Clear button on the grid? Am I missing it? It helps when entering a personal puzzle

Andrew Stuart writes:

Changed to "New" but its in the same position.

Tuesday 29-May-2012

... by: Pieter, Newtown, Australia

Congratulations Andrew and Happy Birthday! I've just noticed it was your Solver's 7th birthday on 28th May 2012. I'd say it has well and truly come of age!

I was reading the Version History page and noticed your own comment for V1.10 "Just nice to know that after two weeks we're still finding better strategies". Ha ha ha!

Well Done!

Andrew Stuart writes:

Wow, has it been so long!
That reminder made me laugh too
Cheers Pieter :)

Wednesday 23-May-2012

... by: Keslen, Canada

Load Sudoku:

When your solver gets to the hidden 149 triple in Box 4, it does something weird with the highlighting, bringing attention to the two 9's in the the far right column of the puzzle.

Andrew Stuart writes:

Well spotted, yes there was a bug with the green candidates being improperly highlighted. It occurred on those rare occasions when the one of the three cells in the triple didn't have a candidate to remove. Thoroughly tested on my set of hidden triple examples now, should be working properly. Appreciate the alert
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Thank-you everyone for all your questions and contributions.