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 !