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?? Main Features

### Core Game Features
- Classic Sudoku Gameplay: A standard 9×9 Sudoku grid
- Multiple Difficulty Levels:
- Easy: Remove 30 numbers
- Medium: Remove 40 numbers
- Hard: Remove 50 numbers
- Smart Hint System: Provides friendly hints when no cells are selected or fixed numbers are selected
- Game Statistics: Records game time, moves, and best scores

### Customization Options
- Symbol Selection:
- Number Mode: Uses numbers 1-9
- Letter Mode: Uses letters A-I
- Background Themes:
- Default Gradient Background
- Pattern Background 1
- Pattern Background 2
- Game-Specific Backgrounds

### User Experience
- Immersive Status Bar: Full-screen gaming experience
- Smooth Animations: Button click feedback, title animation, and decorative element animation
- Game History: Saves the last 5 game records
- Success/Failure Dialog: A beautiful prompt interface at the end of the game

## How to Play

### Basic Rules
1. Objective: Fill in the 9×9 grid with numbers (or letters) so that each row, column, and 3×3 square contains 1-9 (or A-I).
2. Rules:
- Each row can only contain 1-9 (or A-I) once each.
- Each column can only contain 1-9 (or A-I) once each.
- Each 3×3 square can only contain 1-9 (or A-I) once each.
- The initial number (black) cannot be modified.
- The user-entered number (blue) can be modified.

### How to Play
1. Select Cell: Click any cell in the Sudoku grid.
2. Fill in Numbers/Letters: Click the number/letter button at the bottom.
3. Clear Content: Click the Clear button to delete the contents of the selected cell.
4. Game End: When all cells are filled or an error occurs.

### Game Process
1. Start the game and select the difficulty level.
2. Click a blank cell to select it.
3. Use the buttons at the bottom to fill in the corresponding numbers/letters.
4. Continue filling until the entire grid is complete.
5. A completion dialog and statistics will be displayed upon successful completion.

## ⚙️ Settings

### Difficulty Settings
- Easy: Suitable for beginners, removes 30 numbers
- Medium: Standard difficulty, removes 40 numbers
- Hard: Challenging mode, removes 50 numbers

### Symbol Settings
- Number Mode: Traditional numbers 1-9
- Letter Mode: Letters A-I for added gameplay variety

### Background Settings
- Default Background: Classic gradient background
- Pattern Background 1: Simple geometric pattern
- Pattern Background 2: Soft gradient colors
- Game Background: Dedicated game theme background