Open Sudoku is a free and open-source Android game developed by Óscar García Amor. It is a Sudoku game that offers several input modes, including a finger-friendly mode and a numpad at the bottom of the screen. The game is based on the original code of Roman Mašek and has been designed to be ad-free.

In addition to the standard puzzles, Open Sudoku allows users to download puzzles from the web, enter them by hand, or generate them using GNOME Sudoku. The game also keeps track of the user's game time and history, allowing them to export their progress to an sdcard. The game also offers themes for users to customize their experience.