Short version: there are no accounts, no ads, and nothing personal is collected.
Nothing leaves your device. Your place in a game is saved in your own browser so a refresh does not lose it. Cards are calculated from a code rather than stored anywhere, which is why there is no database behind this site.
We use Vercel Web Analytics to count page visits. It does not use tracking cookies and does not identify individual people. We can see that a page was visited and roughly what kind of device it was — nothing that points back to a person.
We also use Google Search Console, which reports how many people found the site through Google searches. It reports totals, never individuals.
If you send a message, we receive your email address and what you wrote, so that we can reply. It is handled by Formspree and sent on to us by email. We do not add you to any mailing list.
This is often used at children's parties and in classrooms. Players never enter names, emails or anything else — no player ever signs in or types anything into the site. Only an adult using the contact form ever provides information.
Use the contact form and we will answer.