(SECUSO) Privacy Friendly Sudoku without permissions or advertising
About this app
Privacy Friendly Sudoku is a logic puzzle game. The goal is to fill the complete board with numbers. Every number may only occur once in every column, row and subsection.
Privacy Friendly Sudoku has three different game modes: 1. a 6x6 game field with 2x3 subsections 2. a 9x9 game field with 3x3 subsections 3. a 12x12 game field with 3x4 subsections
For each game mode there are four different difficulty levels that are not measured by the number of preset values, but rather by the solving strategies needed to solve the game. The generator always tries to provide a game that has the minimum amount of preset values needed to solve the game. Additionally, users can create their own custom sudokus of arbitrary difficulty for each of the three game modes.
Sudokus can be shared with other users by using the available import and export functions. Another community feature is the 'daily sudoku', which is newly generated each day and the same for every user of the app.
The app can be used in both light and dark mode.
Our Privacy Friendly App differs from other applications with respect to two aspects: 1. The Privacy Friendly Sudoku App does not use any permission. 2. The Privacy Friendly Sudoku App completely relinquishes advertisement. Many other free apps in the Google Play Store dazzle annoying advertising and also shortens battery life.
Feel free to contact us via: Bluesky - @secusoresearch.bsky.social https://bsky.app/profile/secusoresearch.bsky.social Mastodon - @SECUSO_Research@bawü.social https://xn--baw-joa.social/@SECUSO_Research/ Job opening - https://secuso.aifb.kit.edu/english/Job_Offers.php
Licensed under GPL-3.0-only, by SECUSO - Security Usability Society.
What's New in v3.2.6
Imported from the F-Droid repository index.
Version history
Feb 24, 2026 · 5 MB · Android API 17–34 · code 101
Imported from the F-Droid repository index.
SHA-256 1aff917f4ac9952bd956f2b19589787b015decc23b4c13268d19f1437c68b5b3
Aug 1, 2025 · 5 MB · Android API 17–34 · code 100
Imported from the F-Droid repository index.
SHA-256 1fa02f0e3f12c293cf5f8d93fad1161869e8d5c5ba4c06ee412694d3b6954da7
Apr 25, 2025 · 5 MB · Android API 17–34 · code 19
Imported from the F-Droid repository index.
SHA-256 c2a582760a33b1c84d9de7247293091aea74832ab2c804337af56e21b3f06ba0
Will it run on your device?
73%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.secuso.privacyfriendlysudoku is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 3.2.5 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Sudoku (Privacy Friendly) first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Sudoku (Privacy Friendly), and a listing is removed when the evidence for it stops holding up.
Get Sudoku (Privacy Friendly)
Every source we list for org.secuso.privacyfriendlysudoku is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
1aff917f4ac9952bd956f2b19589787b015decc23b4c13268d19f1437c68b5b3
Signing certificate
2715af26961bf27383ac5efcd3aa7203c1004d189e9b2d7d5f6d7386cd8095d8
Permissions Required
What each permission lets Sudoku (Privacy Friendly) do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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