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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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If you are writing to alert me of a problem (thank-you!) please include a url to the page in question.
Can get fixes in quicker if I know immediately where to go.
Many thanks to all the people who have helped improve the solvers and strategies with their feedback!

Saturday 11-Apr-2020

... by: David Eide, Oregon United States.

During this stay at home pandemic I thought it would be fun to play Sudoku for two. Not that there is such a thing but Andrew is a clever man and can find a way that two people can complete a puzzle competing against each other. Of course scores and records should be kept so anyone can challenge the top players. Well, people should be rated so a No 1 is not wasting time competing against a No. 8. Thanks. Oh, please let me know when it is available.

Andrew Stuart writes:
I did toy with this idea way back in 2005 and did get some kind of 2 way player working. The tech was unreliable and clunky but that's improved since back then. I'll move it up the to-do list.

The rules I envisaged was both players could fill in any cell at any time and get a point for each correct number. Negative number for incorrect - to discourage spamming. There is an issue of deadlocking, mainly that who gets it first is down to the timing to the server.

Then there is the whole issue of managing queues of people and matching them up. Asynchronous programming is a bit of a dark art. Probably require a good but expensive developer to get it right.

Would be nice at this time, I agree.
I will keep in you in mind for testing then.
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Thank-you everyone for all your questions and contributions.