Privacy policy

When you open ballknowledge, you're signed in anonymously — no account, no email, no password required. That anonymous identity is what lets us keep your streak and remember which players you've already seen.

We store, tied to that anonymous identity:

• Your game sessions — mode, date, whether you solved it, how many guesses.
• Each individual guess and its score breakdown.
• Your streak and the players you've already been served, so you don't repeat one.
• A display name, only if you choose to set one for the leaderboard — it's optional and entirely up to you what it says.

If you choose to “upgrade” your anonymous account with an email address (so your streak survives a device change), that email is stored too — but this is opt-in. Most players never do this, and the game works fully without it.

We do not collect your IP address, device fingerprint, contacts, photos, or anything else outside of gameplay. There is nothing to opt out of beyond what's listed here.

We use Vercel Analytics and Speed Insights — first-party, page-view and performance data served from this site's own domain, not a third-party tracker. We don't run Google Analytics, ad pixels, or any cross-site tracking.

Every piece of data above exists to run the game itself: scoring your guesses, keeping your streak, ranking the daily leaderboard, and letting a head-to-head challenge link know who solved what. Nothing is sold, and nothing is shared with advertisers.

Since sign-in is anonymous, there's no account dashboard yet to self-serve a deletion. Email ballknowledge@gmail.com and we'll delete your data on request.

See the cookies policy for exactly which cookies we use and why.

If what we collect changes, this page will change with it — it's meant to always describe what the app actually does, not what it used to do.