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privacy

Updated 2026-05-13

what we collect

stak.gg stores the minimum needed to make a leaderboard work:

  • An anonymous identifier (a random UUID). On the web it lives in a cookie called mu_id. In the iOS app it lives in the device Keychain. We do not link this to your name, email, phone, IP address, or any third-party identifier.
  • A handle — either auto-generated for you or one you chose. Handles are visible on the public leaderboard.
  • Your run stats: peak tile, drops, merges, cascades, and the move log (column + tile value + millisecond timestamp). Move logs power the replay feature.

what we do not collect

  • No email, no phone number, no name, no account.
  • No advertising identifiers, no SDKs that track you across apps.
  • No analytics product. We read aggregate request logs (nginx), nothing more.
  • No third parties have access to anything we store.

where it lives

Everything is stored in a PostgreSQL database on a server we operate in the Netherlands. Daily encrypted backups are kept for 30 days. The server logs HTTP requests (timestamp, path, user-agent, status code, approximate location from IP geolocation) for operational debugging, retained for 14 days.

your controls

  • Delete your data. In the iOS app, tap your handle in the [1] PLAYER panel and choose reset identity in the sheet. On the web, clear the mu_id cookie in your browser. Either action anonymizes your runs server-side (handle becomes deleted) and unlinks them from any future activity.
  • Report a handle. The leaderboard supports reporting offensive handles — long-press a row in the iOS app, or use the report action on the web. Reports are reviewed manually.
  • Change your handle. Tap your handle pill on the web home page to edit it.

kids

stak.gg has an age rating of 9+. It does not knowingly collect data from anyone under 13. Because no name, age, or contact info is ever collected, we can't tell.

changes

If this policy changes materially we'll update the date above. There's no mailing list, so check this page if you care.

contact

Questions: patrick@movingup.nu.