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!

Sunday 1-Jan-2017

... by: Steven A Bloedel, usa

there is a problem buying puzzle packs. they do not show up like they use to to make a selection for puchase.

also, where can i go to get help with aic's. i can do almost locked sets, but just can not see aic's. i understand them, just can not see them in a puzzle.

Andrew Stuart writes:

I will be releasing some more puzzle packs soon. I upgraded to Windows 10 this year as did many people. Now I find that my old copy of Adobe Indesign isn't working and I can't run the scripts to make the packs. Still scratching my head on this one, but hopefully a workaround soon

Some of the strategies like AICs are a bit academic, in that they are more difficult for pen and paper humans. But we need them if we are going to progress on the crazy difficult puzzles. Sudoku is unusual for being so deep. I added a feature on the solver which shows chains, have you played with that? Otherwise I can only suggest examples. I know some people are good with AICs visually but very few. You'll be pretty expert if you can solve up to locked sets.

Have a great new year

EDIT: New 2017 Puzzle packs available!
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Thank-you everyone for all your questions and contributions.