Web Sudoku is a popular Sudoku website that has recently launched an Android app. It offers an offline Sudoku playing experience on your phone and tablet. The app provides four free levels of difficulty, including Easy, Medium, Hard, and Evil. Along with these levels, the app has an additional Extreme level that offers the hardest puzzles yet.

The app has an easy-to-use interface with a left-handed mode option, which makes it more accessible for left-handed users. The "How am I doing?" button helps users check for mistakes during gameplay. The app also features a "Pencil marking" option that lets users enter possible numbers in a cell. In addition, users can race against the clock in "Competitive mode" and compare their time with millions of Sudoku solvers.

The app also allows users to print unlimited free puzzles using Google CloudPrint. Users can share their Sudoku puzzles with friends and compete with each other. The app supports both landscape and portrait modes, making it convenient for users to play in any orientation. Overall, Web Sudoku is a comprehensive Sudoku app that offers a wide range of features and levels of difficulty, making it a must-try for Sudoku enthusiasts.