Sudoku - Classic Puzzle Game

Overview
Embark on a brain-teasing journey with Sudoku - Classic Puzzle Game, a digital twist on the time-honored numbers challenge.

Key Features
1. Four levels of difficulty, catering to novices and Sudoku veterans alike.
2. Hundreds of unique puzzles across all difficulty settings.
3. Save your progress automatically to return to your last spot with ease.
4. Offer an infinite number of undos and redos for stress-free play.
5. Efficient drafting with auto-fill functionality.
6. Hints available for beginners to learn and improve their skills.
7. Advanced color input system designed for expert puzzle solvers.
8. A clean graphical interface along with smooth gameplay controls.
9. Record your accomplishments with Google Play Games achievements.
10. Compatible with both smartphones and tablets for on-the-go puzzle solving.

Helpful Features
1. Flexible selection modes: toggle between selecting digits or cells first.
2. Pencil in possibilities with either automatic or manual pencil modes.
3. Configurable keyboard layouts for comfortable number entry.
4. Helping highlights indicate vertical and horizontal potential matches.
5. Highlight and find all instances of a specific digit with the number finder.
6. Keep track of numbers used with the handy number counter.
7. Rule violation warnings to avoid mistakes as you play.
8. Visual feedback on the keyboard for correct or incorrect number counts.
9. Advanced players can use multiple colors aid to strategize number placements.
10. Error detection: Automatically flags inconsistencies as you go.
11. Perpetual auto-fill progressively updates pencil-mark possibilities.
12. Enlarged number display provides clear visibility.

Interesting Gameplay
1. Carefully fill the 9x9 grid with numbers, ensuring no repetition in any row, column, or 3x3 sub-grid.
2. Strategize to decode the logical pattern for placing the digits correctly.
3. Experiment with complex solutions as you ascend to higher difficulty levels.
4. Use accumulation techniques like cross-hatching to reveal hidden numbers.
5. Utilize process of elimination for placing correct numbers and combating challenging puzzles.