Free Sudoku is a puzzle game designed for Android 9.0, developed by MobiDev Studio, and available for free. It is a great way to pass the time while also training your brain. This version is incredibly lightweight, taking up less than 2MB of space, making it quick to install and start playing.

One of the best features of Free Sudoku is its 3 difficulty levels, which cater to players of all skill levels. Additionally, the game offers pencil marks (also known as notes), which can be very helpful when solving complex puzzles. You can also check for errors and clear notes, making the gameplay even smoother. Furthermore, the game has an auto-save feature, so you can pick up right where you left off, as well as unlimited undo and redo options.

Overall, Free Sudoku is an enjoyable and challenging puzzle game that is perfect for anyone looking for a fun way to train their brain. However, it is important to note that the game does not offer an auto-fill feature, although this can be disabled if desired. If you have any questions or concerns, please contact the developer's support team at