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 23-Jul-2006

... by: Terry Stewart, Rochester, Minnesota, USA

Load Sudoku:

This puzzle can be solved with your older version (circa 2006-06-06), but gets stuck with the current version (online) at the point where the old version finds a Y-Wing. When I say "gets stuck" I mean that pressing the "take step" button seems to have no effect and gives no message.

I really appreciate the work you put into the Sudoku Solver,
Terry Stewart
Rochester, MN USA

Andrew Stuart writes:
I was doing some back end work this morning which may have interrupted the solver app. I've just run this and it solves completely with just simple colouring as the hardest strategy. Seems fine right now.

Saturday 22-Jul-2006

... by: Joanne W, Wales, UK

Wonderful step-through solver, very much appreciated. helped me learn a great deal.

Saturday 22-Jul-2006

... by: BoB, USA

Load Sudoku:

The previous version of the web solver notified the user when all strategies were exhausted with a pop-up message. The message would tell the user they must take a guess. The new version now simply rolls over and tries all the strategies again. Don't know if you consider this a bug. The following puzzle is an example.

[Edited - see link above]

Also, I love your solver. I think it's the best because of it's "step" design versus solving the whole puzzle in one step. The teaching tutorials are some of the best I've seen.



Andrew Stuart writes:
A bug, well spotted, it wasn't actually doing the last strat. I've fixed it I think, have a go now.
Thanks for the alert!
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Thank-you everyone for all your questions and contributions.