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### Basic Rules
1. **Click Cards**: Click on a card in the game area to move it to the bottom tray.

2. **Match-3 Mechanism**: When there are 3 cards of the same pattern in the tray, these cards will automatically be eliminated.

3. **Victory Condition**: Eliminate all cards in the game area to win.

4. **Loss Condition**: The game is lost when the tray is full and no match-3 can be formed.

### Game Mechanics

- **Card Obscuring**: Upper-layer cards obscure lower-layer cards; only unobscure cards can be clicked.

- **Smart Detection**: The game automatically detects unfinishable situations and ends early.

- **Tool Assistance**: Provides shuffling, undo, and hint tools.

## Game Modes

### 1. Classic Mode

- **Number of Cards**: 20-30 cards

- **Difficulty Level**: Moderate

- **Suitable for**: Beginner players

### 2. Endless Mode

- **Features**: Increasing difficulty level. **Challenge**: Suitable for players seeking a challenge

**Continuous Play**: Allows for multiple consecutive levels

### 3. Hard Mode

**Features**: Dense card stacking

**Difficulty Level**: High

**Suitable for**: Experienced players

### 4. Daily Challenge

**Features**: New puzzles updated daily

**Uniqueness**: Different challenges every day

**Social**: Compare scores with friends

## Assistive Tools

### Shuffle

**Function**: Rearranges cards in the game area

**Limitation**: Cannot be used when there are fewer than 2 cards remaining

**Sound Effects**: Provides special sound feedback when used

### Undo

**Function**: Undoes the last move

**Limitation**: Cannot be used when there are no undoable actions

**Strategy**: Recommended for use at crucial moments

### Hint

- **Function:** Highlights cards that can form a match-3.

**Smart:** Prioritizes cards that can form a match-3.

**Limitation:** Cannot be used when there are no available moves.