Who we are and what this covers

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Sudoku - Grid Master ("the app") is published by Skogmill, based in Sweden. The app has no accounts, no advertising and no third-party tracking. You can play every puzzle without sharing anything.

This policy explains what leaves your device when you take part in leaderboards, challenges or weekly events, who can see it, and how to have it removed. Skogmill is the data controller.

 

What the app sends, and when

Information leaves your device only when you submit to a leaderboard, answer a challenge or finish a weekly event. Then the app sends:

• A display name. A name you choose. Challenges and weekly events need one; the daily leaderboard asks for one when you submit a score. If you would rather not be identifiable, do not use your full real name.

• Your result. Completion time, number of mistakes, difficulty, the score calculated from them, and the time it was received.

• A player identifier. A random code made by the app or, if you are signed in to iCloud, tied to your iCloud account. It tells your own entries apart and prevents duplicates. It is not linked to your real name, email or any other personal information, unless you use your real name as your display name.

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Leaderboards are public

Your display name, time, mistakes, difficulty and score are visible to every user of the app in the daily, weekly, monthly and yearly leaderboards. You are shown a notice before your first daily submission, and submitting a daily score is optional.

Entries stay visible for as long as the leaderboard they belong to is shown, or until you ask us to remove them (see Your rights).

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Challenges against friends

When you challenge a friend, the app creates a challenge record with the puzzle, your display name, your result and the time. Your friend opens a link, is asked for a display name before playing, and their name, result and whether they finished are added to the same record. Both of you see each other's name and result.

A challenge can be answered once, within 10 days. Anyone who has the link can open it, so only send it to people you want to play with. The app does not read your contacts and does not see who you send a link to.

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Weekly events

Each week the app offers an event puzzle that everyone plays once. If you have not chosen a display name, the app asks for one and tells you it appears on the event leaderboard.

When you finish the puzzle, your result is sent automatically to that week's event leaderboard: display name, time, mistakes, score and your player identifier. It is visible to every user of the app. A puzzle you do not finish, or lose, is not sent.

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Notifications

The app can send two notifications: a reminder about an unfinished daily puzzle, and, only if you switch it on, a reminder on Monday mornings when a new weekly event starts. Both are scheduled on your device by iOS.

The app does not use a push notification server and does not collect a notification token. You can turn each reminder off in the app's Settings, or all notifications in iOS Settings.

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Data that stays on your device

Your statistics, achievements, streaks, saved games, game and challenge history, weekly event results and medals, and settings are stored on your device. If you are signed in to iCloud, parts of this are synced between your own devices through your personal iCloud account. We cannot see it, and it is never sent to us or to anyone else.

You can reset your statistics in Settings. Deleting the app removes what is stored on the device. Data synced through iCloud can be managed in iOS Settings under your name and iCloud.

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Where the data is stored and who can see it

Leaderboard, challenge and event data is stored in Apple's CloudKit. We do not run our own servers. Apple processes it on our behalf and may store it on servers outside the EU and EEA, under Apple's own terms and safeguards.

We can see these records in CloudKit. We use them only to run leaderboards, challenges and events, to keep them fair (for example, to prevent duplicate entries), and to handle removal requests. We do not sell, rent or share them with anyone for advertising or marketing.

If you choose to share analytics with app developers in iOS Settings, Apple may give us anonymous crash and usage statistics that do not identify you. We advertise the app on the App Store with Apple Search Ads and receive summarised campaign statistics from Apple, not information about individual users.

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What we do not do

• We do not show advertisements in the app.

• We do not use third-party analytics or tracking tools.

• We do not collect your device's advertising identifier (IDFA).

• We do not ask for an account, email address or phone number.

• We do not collect your location.

• We do not access your contacts, photos or microphone.

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Why we handle it, and how long we keep it

We handle leaderboard, challenge and event data to provide the features you choose to use, and because we have a legitimate interest in keeping them fair and secure.

We keep entries for as long as the leaderboards, challenge history or events they belong to are shown in the app, and until you ask us to delete them. We hold no other personal data about you.

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Children, security, changes and contact

Children. The app is not directed at children under 13 and does not knowingly collect their personal information. The display name is the only text a player types, and it is public on leaderboards, so parents should help children choose a name that does not identify them.

Security. Leaderboard, challenge and event data is protected by Apple while stored and in transit. No system is perfectly secure.

Changes. If this policy changes, the new version is posted at this address with a new date.