SUDOKU - Simple brain puzzle

* Sudoku - Classic Brain Puzzle Train your brain with the world's most popular number puzzle! Whether you're a beginner or a Sudoku master, enjoy a premium puzzle experience with our beautifully designed app. ** KEY FEATURES * Multiple Difficulty Levels • Easy, Medium, Hard, Expert, and Special modes • Perfect for beginners and advanced players alike • Progressive unlock system to challenge yourself * Smart Game Features • Pencil mode for note-taking • Auto-remove memos when placing numbers • Smart notes to prevent invalid entries • Unlimited undo function • Hint system with step-by-step explanations * Track Your Progress • Detailed statistics for each difficulty • Personal best times and win rates • Perfect game tracking * 2-Player Battle Mode • Challenge friends in real-time battles • Compete to solve puzzles faster * Customizable Experience • Light and Dark themes • Timer and mistake limit options • Highlight same numbers and areas • Sound effects toggle * Multilingual Support • English, Korean, Japanese, Chinese