Sudoku Classic Fun:6400 Levels is an iPhone game that offers over 6000 unique number puzzles to give your mind a real workout! With 4 difficulty levels ranging from easy to master, this game is suitable for players of all skill levels.

One of the standout features of Sudoku Classic Fun is its auto-save functionality, which allows you to save your progress on each level and continue whenever you have some free time. This ensures that you never lose your progress and can pick up right where you left off.

To help you solve the puzzles, the game highlights any duplicates and conflicts, making it easier to avoid repeating numbers in a row, column, or block. You can also make notes in the free cells to keep track of possible numbers, giving you a strategic advantage.

Additional features include hints, auto-check, and duplicates highlight, which provide assistance and guidance throughout the game. The undo feature allows you to reverse any incorrect inputs, ensuring that you can correct mistakes without starting the level over.

With colorful highlights of different cells, Sudoku Classic Fun offers a visually pleasing experience that enhances the gameplay. Whether you're a Sudoku enthusiast or new to the game, this app provides hours of brain-teasing entertainment on your iPhone and iPad.