SudokuWiki.org
Strategies for Popular Number Puzzles
Donations
There is a long and worthy tradition on the Internet of putting up great stuff for free. It is that spirit I have hosted and developed my step-by-step solver and created puzzles to play since 2005. It has been great fun and I have had many useful contributions and suggestions that keep it leading-edge.
It does generate a great deal of traffic however and I want to minimise clutter from advertisements. sudokuwiki.org is hosted on its own server with all the website projects I maintain. If you would like to help with the server hosting costs the donate button on the right will take you through the secure Stripe process. No account creation is necessary.
Many thanks if you have donated !
Andrew Stuart
It does generate a great deal of traffic however and I want to minimise clutter from advertisements. sudokuwiki.org is hosted on its own server with all the website projects I maintain. If you would like to help with the server hosting costs the donate button on the right will take you through the secure Stripe process. No account creation is necessary.
Many thanks if you have donated !
Andrew Stuart
... by: Dan
Saturday 1-Mar-2025
genuinely one of the most invaluable resources on the internet, thank you so much for hosting this for free
... by: Mawf
Sunday 15-Dec-2024
Thanks, Andrew,
Just opted for a one year membership. I really appreciate your site; you've taught me most of my sudoku solving strategies. I look forward to checking out the rest of your puzzles.
Thanks,
Mawf
Just opted for a one year membership. I really appreciate your site; you've taught me most of my sudoku solving strategies. I look forward to checking out the rest of your puzzles.
Thanks,
Mawf
... by: Phil Salisbury
Thursday 16-May-2024
We have been using Sadman Sudoku for many years and loved it. We have changed to Chromebox and can no longer use Sadman's software.
Your Sudoku software works very well on Chromebox, BUT, I cannot find the solutions written out. Where are they?
Thanks for your great work!
Phil
Your Sudoku software works very well on Chromebox, BUT, I cannot find the solutions written out. Where are they?
Thanks for your great work!
Phil
... by: sapper
Tuesday 5-Dec-2023
What a very excellent site, this has really helped to take my Sudoku solving skills to the next level (but I'm still very much a learner)
regards Sapper JJ
regards Sapper JJ
... by: Larry
Tuesday 7-Nov-2023
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
... by: Daxx
Friday 27-Oct-2023
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)
... by: Yeonghun Kim
Saturday 4-Mar-2023
I really appreciate your all effort for this webpage.
I'm from South Korea, Ph.D student in CS (developer) and also a puzzle lover interested in many of number-based puzzle like Sudoku (with so many variations), Kakuro, Nonogram, TetraSquare, Bridges, and so on.
My recent dream is to apply SuDoKu global competition and try to learn so many nice sudoku solving techniques.
In Korea, there is a general wiki named 나무위키(NamuWiki, 'Namu'=tree) having a document about the techniques but lack of some advanced techs.
Today I've found this page, shocked about your step-by-step solver with all tech documents and really being encoraged to enjoy sudoku harder than before.
Thanks again and hope eternity of this page.
I'm from South Korea, Ph.D student in CS (developer) and also a puzzle lover interested in many of number-based puzzle like Sudoku (with so many variations), Kakuro, Nonogram, TetraSquare, Bridges, and so on.
My recent dream is to apply SuDoKu global competition and try to learn so many nice sudoku solving techniques.
In Korea, there is a general wiki named 나무위키(NamuWiki, 'Namu'=tree) having a document about the techniques but lack of some advanced techs.
Today I've found this page, shocked about your step-by-step solver with all tech documents and really being encoraged to enjoy sudoku harder than before.
Thanks again and hope eternity of this page.
Andrew Stuart writes:
Thank-you, very kind!... by: Joe D
Wednesday 8-Feb-2023
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
... by: Papa Charlie
Tuesday 7-Feb-2023
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.
... by: Mike H
Wednesday 15-Jun-2022
Finally, I GET Sudoku thanks to this app!
... by: Mohegan Son
Sunday 12-Jun-2022
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.
... by: renevers
Tuesday 12-Apr-2022
Your puzzles make my day good. One killer and a Jigsaw
... by: Gunnar W.
Tuesday 4-Jan-2022
Thank you so much.
I learned a lot from your comprehensive and superb explanations.
I learned a lot from your comprehensive and superb explanations.
Andrew Stuart writes:
Thank you as well!... by: P Brenner
Wednesday 29-Dec-2021
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!
Andrew Stuart writes:
Just been checking Stripe - thank you very much for your docation! Really glad the site has been so useful to youHave a great 2022!
... by: Uli S
Saturday 17-Jul-2021
Thanks a lot for all the work
Andrew Stuart writes:
Thank you!