Sudoku is the perfect puzzle app for all ages. With its easy-to-use interface, this game is sure to be your favorite. This app comes with four difficulty levels that will keep you engaged for hours. You can exit the game anytime, and Sudoku will save your progress automatically.

Sudoku offers three input modes - "Digit first," "Cell first," and popup. It also includes pencil marks with an auto-fill/erase option, selected digit and various other highlighting options, show digit counts option, and unlimited undo and redo options. You can submit your results and track your progress online, and even take part in weekly Sudoku competitions.

This app supports trackball, touch screen, and keyboard. The game also includes intelligent hints that use only logic and two levels of automatic error checking options. However, the app is ad-supported, and you have a choice of ad formats: in-game banners or in-between games interstitials.

To use the app's competitions and game results upload feature, the INTERNET permission is required. Additionally, the READ and WRITE_EXTERNAL_STORAGE are needed for move-to-SD functionality. If you have any questions, comments, or suggestions about improving this Sudoku app, please contact the support team at

Enjoy Sudoku and its various features that make it the ultimate puzzle companion.