Thanks for the great site Andrew, and good on you for keeping it ad free. Made a long-overdue contribution today - appreciate your work! Larry

Thanks Andrew. I've been using your excellent KS solver quite a lot :))

If you do Bitcoin, you might consider putting a "receive address" on your Donate page similar to the bottom right of this page:

https://bitcointicker.co/stamp/btc/usd/12hr/

Optionally, you could generate a new address, occasionally, so that it's not so easy to snoop what donations have been made (or have not ;) -- perhaps automate the address change (?)

Cheers,

Dave B (UK)

I've been pushing my limits with advanced sudoku since lockdown, and sudokuwiki.org has been such a great resource. Thanks for providing it. Hope to donate again later. Joe D

Many thanks for all the effort that you must have invested into programming the algorithms/heuristics and the website, which is a joy to visit.

Thank you for all of the great information. Your explanations are simple, straightforward and easy to understand. I've been trying to figure out X-Wings and XY Wings for a while now, your instructions and examples were a huge help to me.

Thank you so much.
I learned a lot from your comprehensive and superb explanations.

I have been enjoying your site for a number of years now, and have vastly increased my ability to solve tough Sudoku puzzles. I finally realized I could make a donation for it - thank you so much!

Thanks a lot for all the work