Privacy policy

Last updated: 7 November 2026

This privacy policy describes how Cube Sudoku (“the app”) handles information. The app is published by Dream Factory (Patrick Schibli), Uster, Switzerland.

Contact: patrick@dream-factory.app

Cube Sudoku is an offline 3D Sudoku game. It contains no advertising, no third-party analytics, and no tracking for advertising or measurement. You can play without creating an account.

1. What the app stores on your device

The app keeps gameplay data locally so you can continue where you left off:

• the current free-play and Daily Cube sessions (board, notes, undo history, timer)
• statistics such as solved puzzles, best times, streaks, mistakes, and hints used
• settings and tutorial progress
• Assistance and scoring: previously shown hint steps, checked cell values, revealed incorrect values, the error-checking state, and the scoring rules and time penalties applied. These details preserve your game and score when you resume and prevent the same assistance from adding time again.
• Free puzzle allowance: the number of free puzzles started and the start time of your most recent free puzzle, so the app can determine when another free puzzle becomes available.
• Game Center: daily results awaiting submission and their associated UTC day. Results from previous UTC days are not submitted to a new day’s leaderboard.

This data stays on the device unless one of the optional services below is enabled. Deleting the app removes the local data.

2. Optional iCloud (CloudKit)

When iCloud is available for the app, Cube Sudoku syncs your completed puzzle history to the private CloudKit database in your iCloud account. Starting with version 1.2, results are stored in the CubeSudokuSolveHistoryV2 zone of the iCloud.app.dream-factory.cubesudoku container. Existing results in the earlier CubeSudokuSolveHistory zone are still read; version 1.2 no longer writes results to that earlier zone.

A result includes the puzzle identifier, difficulty, playing time, completion date, mistake and hint counts and, where applicable, daily puzzle identifiers, generation data and puzzle rating. It also includes the scoring rules version and an assistance summary: whether error checking was used, how many values were checked and incorrect values revealed, the total time penalty, and whether these details are complete.

Sync supports restoring and reconciling your result statistics. It transfers completed puzzle history, not the full game in progress with its notes or the detailed record of individual checked cell values and hint steps. Earlier app versions cannot read the new zone. Update the app on all your devices to make results from version 1.2 available there.

• The local device remains authoritative if iCloud is unavailable.
• The data is stored in your private CloudKit database, not in a public database.
• You can stop this by signing out of iCloud or disabling iCloud for the app in system settings.

The app does not read your contacts, photos, or other iCloud content.

3. Optional Game Center

Game Center is optional. The app works fully if you decline sign-in or have no network.

If you sign in, Apple may process your Game Center identifier and alias so the app can:

• submit scores for solved Daily Cubes to their matching Easy, Medium, or Hard leaderboards
• unlock achievements

For eligible completed daily puzzles, the app submits a ranked time to the appropriate Game Center leaderboard. Starting with version 1.2, this time consists of active playing time plus time penalties for newly shown hint steps, the first activation of error checking on certain difficulty levels, and newly revealed incorrect values. The rules for each difficulty level are explained on our support page. Results calculated under different scoring rules use separate leaderboards. Game Center data is processed by Apple under Apple’s privacy policy. Signing out of Game Center stops new submissions; existing leaderboard entries remain under Apple’s Game Center rules.

4. Purchases (StoreKit)

The full version is a one-time non-consumable In-App Purchase processed by Apple. Apple handles payment, receipts, Family Sharing, Ask to Buy, and restore.

The app reads the transaction result only to unlock paid features (unlimited puzzles, Expert and Master, unlimited hints, detailed statistics). It does not receive your full payment-card details.

To restore an existing purchase, use “Restore Purchases” in the app. Use the Apple Account associated with the original purchase or an eligible Family Sharing entitlement.

5. What we do not collect

The app does not:

• show ads or use an advertising identifier
• include analytics, crash-reporting, or attribution SDKs
• sell or share personal data with data brokers
• require an email, name, or password of its own
• access the camera, microphone, contacts, or location

The developer website dream-factory.app is separate from the app and may use its own cookies or analytics. This policy covers the Cube Sudoku app only.

6. Legal basis (EEA / UK / Switzerland)

Where GDPR or the Swiss FADP applies, processing is based on:

• contract / requested service — local gameplay, StoreKit unlock, optional iCloud sync and Game Center
• legitimate interests — running and supporting the app, answering support mail

You may request access, correction, deletion, or restriction, and you may lodge a complaint with a supervisory authority. For device-local data, deleting the app is the practical deletion path. For iCloud and Game Center, use Apple’s account controls as well.

7. Children

Cube Sudoku is a puzzle game suitable for a general audience. It does not knowingly collect personal data from children. Game Center and iCloud follow the Apple ID and parental-control settings on the device (including Ask to Buy).

8. Changes

If this policy changes, the “Last updated” date will change. Material changes will be reflected in the copy you host at the privacy URL used on the App Store product page.

9. Contact

Dream Factory
Patrick Schibli
Uster, Switzerland
patrick@dream-factory.app