Privacy policy
You can use every hint, answer and tool on this site without an account. We collect as little as we can.
Stored in your browser
- Theme choice (light, dark or automatic), so the site looks the way you picked.
- Solver progress, so your boards are still there if you reload the page. The solver has a button to clear it.
These stay on your device and are not sent to us. Clearing your browser's site data removes them.
If you vote, share a result or comment
The first time you take part, we set a cookie with a random ID so you can change your vote later and so we can limit spam. It lasts up to 400 days. We store your vote, any result or comment you submit, and the display name you choose, if any. We do not ask for your name or email to take part.
If you contact us or report a correction
We store your message and, only if you give it, your email address so we can reply. Your email is never published. Correction notes we publish never include your message or contact details.
Server logs and security
Like most websites, our server keeps short-term technical logs, such as IP address, browser type and the pages requested, to keep the site running and to stop abuse. To limit spam, form submissions are briefly counted per network address. The site is delivered through Cloudflare, which handles these requests on our behalf.
Visitor statistics
We use Cloudflare Web Analytics to count page views and see how fast pages load. Cloudflare adds a small script from static.cloudflareinsights.com to our pages, which reports the page address and page-load timing to Cloudflare. Cloudflare says this service does not collect visitors' personal data and does not track individual people across websites. We see only totals, such as page views per page.
What we do not do
We do not sell personal information and we do not show advertising. If that changes, we will update this page first.
Your choices
To have your comments, results or messages removed, use the contact form and tell us roughly when you posted. If you left an email with a message, we can find it that way.