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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