Privacy Policy

Two modes do need an account, because they have to remember who you are: themed Topics, and Tournament challenges against a friend. Signing in uses Sign in with Apple, so the app never sees or stores a password.

When you sign in, we store the app-specific identifier Apple gives us, your device's time zone (so an evening reminder arrives in the evening) and whether you want that reminder. Apple passes on your email address only the first time you authorize the app; if it does, we keep it to identify your account. You can use Apple's Hide My Email instead, and everything works the same.

Tournament also asks you to choose a display name. That name is what your opponent sees, so pick something you're happy for them to read — it doesn't have to be your real name. If you turn on notifications, the app registers a token for your device so we can send them.

Once you sign in, the app's usage records for your install (described under Analytics) are linked to your account, including those from before you signed in.

When you play a round, the app sends your map guess and year guess to our server to score it and return the correct answer. We keep each scored guess, with the random install identifier and, if you're signed in, your account, so we can see which events are hardest and how the game is played. Nothing about a guess identifies you by name.

Each finished week of the Weekly Expedition is also kept: the stamp you earned, how many days you played the Daily Challenge, and how many of the week's topics and duels you played — again with the install identifier and, if you're signed in, your account.

Signed in, some results are kept against your account so the features can work. We record which days you completed the Daily Challenge, which is what keeps your streak in step across devices. In a Tournament we store both players' guesses, scores and timings so the match can be scored and shown to you both — your opponent only ever sees your guess for an event they have already played themselves. A challenge stops accepting play seven days after it was created.

The app records what happens as you use it — for example, which screen you opened, which game you started and finished, your score, and which badges and stamps you earned — so we can understand how the game is played and improve it. These events go to Firebase Analytics, a service provided by Google, and to our own database.

Each event carries the random identifier the app creates for your install, the app version and your device's language and region setting. If you're signed in, our copy is also linked to your account, so we can see, for example, how players who sign in use the game differently. Firebase works out which country players are in from the IP address, at the country level only — never a precise location — and the app never asks for or accesses your device's location.

None of this is used for advertising or to track you across other apps or websites. See Firebase's privacy policy for details on how Google processes its part.