Privacy Friendly Sudoku is a logic based game.
It does not use any permission, as the app can provide its full functionality without the usage of permissions. It also does neither include advertisement nor tracking mechanisms.
As it is part of the Privacy Friendly Apps developed by the SECUSO research group of the Technische Universtität Darmstadt in Germany it is optimized due to user's privacy.
Further development requires Android Studio.
Privacy Friendly Sudoku is lisenced under the GPLv3. The icons ic_trophy_award_black_48dp and ic_trophy_black_48dp are licensed under the Sil Open Font License Version 1.1.