# Sudoku (Privacy Friendly) (open-source game)

> Sudoku (Privacy Friendly) is a free, open-source game for Android. (SECUSO) Privacy Friendly Sudoku without permissions or advertising. It has 207 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/SecUSo/privacy-friendly-sudoku |
| Platforms | Android |
| Built with | Java |
| GitHub stars | 207 |
| License | GPL-3.0-only (open source) |
| F-Droid | https://f-droid.org/packages/org.secuso.privacyfriendlysudoku/ (package org.secuso.privacyfriendlysudoku) |
| F-Droid anti-features | none flagged |
| Google Play | not linked |
| App Store | not linked |
| Website | https://secuso.aifb.kit.edu/english/Sudoku.php |
| Official | no |
| Category | Games |
| Latest release | v3.2.6 (Feb 9, 2026) |
| Last commit | Apr 17, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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Canonical page: https://appsgit.com/mobile-apps/sudoku-privacy-friendly
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