PopBubble

PopBubble is a classic Bubble Shooter elimination game. Players shoot colored bubbles from the bottom of the screen toward the top, aiming to group 3 or more same-colored bubbles together to pop them. The goal is to clear all bubbles in the current level.

### 2. Basic Controls

1. Aim & Shoot: Press and drag on the bottom of the screen to adjust your aim angle (a guide line will be shown). Release your finger to fire the bubble.
2. Wall Bounce: Bubbles bounce off the left and right walls. Use ricochets to reach bubbles that are hard to hit directly.
3. Switch Color: Tap the switch button next to the launcher to change the current bubble's color, helping you match hard-to-reach areas.
4. Pause: Tap the pause button at the top to pause the game. From the pause panel, you can toggle music and sound effects independently.

### 3. Core Mechanics

- Color Matching: When a fired bubble hits the ceiling or an existing bubble, it locks into place. If 3 or more same-colored bubbles become adjacent, they are popped.
- Hanging Drop: After popping, any bubbles disconnected from the ceiling will fall. Falling bubbles grant bonus points.
- Combo System: Each successful elimination increases the combo counter. The higher the combo, the more points per bubble. If a shot results in no elimination, the combo resets to 0.
- Running Out of Bubbles: If you exhaust all allocated bubbles before clearing the level, the game ends in failure.

### 4. Special Power-ups

Special items unlock starting from Level 3. There are 4 types:

| Power-up | Icon | Effect |
|----------|------|--------|
| Bomb | 💣 | Destroys the target bubble and all 6 adjacent bubbles around it |
| Laser | 🔫 | Pierces in a straight line, eliminating every bubble in its path |
| Rainbow Ball | 🌈 | A wild card that matches any color; pops all connected same-colored bubbles around the target |
| Lightning | ⚡ | Eliminates an entire row of bubbles at the target position |

> Each power-up starts with 1 free charge. Once depleted, you can buy more for 100 coins each, or watch an ad if you run out of coins.

### 5. Scoring

- Pop Score: Combo × 10 (per bubble popped)
- Drop Score: Combo × 2 × 10 (per bubble that falls)
- Perfect Score: Total initial bubbles in the level × 40

### 6. Star Rating

Each level awards 1–3 stars based on your final score:

| Stars | Requirement |
|-------|-------------|
| ⭐⭐⭐ 3 Stars | Score ≥ 100% of Perfect Score |
| ⭐⭐ 2 Stars | Score ≥ 70% of Perfect Score |
| ⭐ 1 Star | Score ≥ 20% of Perfect Score |

### 7. Rewards & Economy

- Daily Check-in: Available from Level 8 onwards. A 7-day repeating check-in system rewards you with power-ups or coins. Watch an ad to double your reward.
- Online Reward: Claim a random power-up + 80 coins every 120 seconds of playtime.
- Coin Shop: Earn coins by watching ads. Spend 100 coins to purchase any power-up.
- Revival on Failure: When you run out of bubbles, watch a video ad to receive 5 extra bubbles and continue playing.

### 8. Levels & Difficulty

- The game features 32 predefined levels. Higher level numbers mean greater difficulty.
- Special obstacle bubbles may appear:
- Rock Balls (value 7): Cannot be popped; you must shoot around them.
- Ice Balls (value 6): Require two hits to be fully eliminated.