AirDuel

Air Duel is a vertical-scrolling shoot 'em up (STG) game. You control a fighter jet battling through waves of enemy aircraft and powerful Bosses across 9 levels. The game features multiple upgrade systems including purchasable planes, equipment enhancements, and pet companions.

### 2. Basic Controls

| Control | How To |
|---------|--------|
| Move | Touch and drag on the screen; your fighter follows your finger |
| Auto-fire | Your plane shoots automatically — focus on dodging and positioning |
| Use Skills | Tap the skill buttons at the bottom of the screen |

### 3. Skill System

There are 4 active skills available:

| Skill | Cooldown | Effect |
|-------|----------|--------|
| Normal Missile | 6 sec | Fires a missile straight ahead. Can buy extra ammo. |
| Ice Missile | 5 sec | Fires a homing missile that tracks enemies. Can buy extra ammo. |
| Nuke | 3 sec | Full-screen attack: 150 damage to normal enemies, 300 to Bosses |
| Shield | 20 sec | Become invincible for 8 seconds. Cannot use during cooldown. |

Note: Normal Missiles, Ice Missiles, and Nukes have limited uses. Purchase more ammo from the shop.

### 4. Level Progression

1. Enemy waves spawn from the top of the screen
2. Destroy enemies to earn Level Score
3. Once your score reaches the pass score, remaining enemies are cleared
4. A "WARNING" animation appears
5. The Boss enters from the top
6. Defeat the Boss to clear the level

> 9 levels total. Each has different enemy types, Bosses, and pass scores. Difficulty increases with each level — enemies and Bosses have more HP.

### 5. Win / Lose Conditions

- Win: Reach the pass score → defeat the Boss → your plane flies off screen → victory screen
- Lose: Your HP drops to 0 → game over screen
- Revive:
- Watch a rewarded video ad to revive once after first death
- Revive with: full HP + shield + default weapon

### 6. Power-up Drops

Destroyed enemies may drop power-ups. Fly over them to collect:

| Item | Effect |
|------|--------|
| Sub-weapon (box1) | Particle effect secondary cannon, lasts 6 sec |
| Barrage (box2) | Pink circular bullet barrage, lasts 8 sec |
| Line Bullets (box3) | Enhanced row of bullets, lasts 4 sec |
| Heart (box4) | Restore 35% HP |
| Normal Missile | Missile ammo +1 |
| Ice Missile | Ice missile ammo +1 |
| Nuke | Nuke +1 |
| Gold Coin | Coins +6 |
| Medal | Medals +3 |

### 7. Shop System (Hangar)

Access from the main menu via "My Hangar". It has 3 tabs:

#### Fighters

| Name | Price | HP | ATK | Weapon |
|------|-------|----|-----|--------|
| Fox No.1 | Free (starter) | 5 | 1 | Heavy machine gun |
| Blue Fat Man | 1,200 coins | 10 | 2 | Dual Gatling |
| Superstar | 2,900 coins | 12 | 5 | Flame bomb |
| Harvester No.1 | 4,500 coins | 18 | 8 | Triple enhanced cannon |
| Devourer | 6,200 coins | 20 | 10 | Particle cannon |

#### Equipment

| Item | Price | Effect |
|------|-------|--------|
| Ordinary missile | 180 coins | Normal missile capacity +1 |
| Ice missile | 380 coins | Ice missile capacity +1 |
| Protective steel plate | 800 coins | Defense +3 |
| Armor-piercing projectile | 1,200 coins | Attack +1 |
| Nuclear bomb | 260 coins | Nuke +1 |

#### Pets

| Name | Price | Description |
|------|-------|-------------|
| Perfect | 500 coins | Two wingmen assist in combat |
| Guardian | 680 coins | Fires barrages forward and to the sides |
| H/PJ Defense Gun | 950 coins | Smart gatling gun, auto-locks targets |
| Black Angel | 1,280 coins | Fires homing shadow missiles; heals 10% HP per second |

### 8. Level Completion Rewards

After clearing a level, you receive:
- Random 50~280 medals
- Random 100~560 coins
- Highest level progress is updated

Double Rewards: Watch a rewarded video ad to double your medals and coins.