Privacy

In short

• There are no accounts and no ads.
• Your progress stays in this browser.
• The site tracks usage only if you allow it. That helps make it easier to use.
• Report/Feedback sends only what you write in it, when you press Send.

Kept in your browser

Your attempts, answers, results, the theme you chose and your choice about statistics are kept in the local storage of this browser on this device. The site does not send them anywhere.

To delete everything, clear the data of this site in the settings of your browser. A private window or a browser that blocks storage keeps your progress only until the page is closed.

Usage statistics

Statistics have one goal, to make the site easier to use. They show which pages people open, where they get stuck and what is hard to find.

If you allow them, a statistics service tracks clicks, scrolling and mouse movement on these pages. Text you type into a field is never included. To tell one visit from another, it keeps a random ID in a cookie. No names and no emails.

Data about single visits is kept for 30 days, totals for 9 months. Statistics stay off until you turn them on, and you can turn them off here at any time.

Report/Feedback

When you press Send, your message, its topic, the question or page you are on and the email you left go to the author by email through Cloudflare. The email is optional and is used only for a reply.

Changes and questions

When this page changes, the date at the top changes too. If the change is about statistics, the site asks you again.

Questions about your data go through Report/Feedback.