Created a complete typing game with all requested features:

**Game Mechanics:**
- Words fall from random positions at varying speeds
- Type words correctly to clear them before they reach the bottom
- Missing words reduces health by 10%
- Game ends at zero health

**Difficulty Levels:**
- Easy/Medium/Hard/Extreme settings
- Affects word complexity, fall speed, and spawn rate

**Features:**
- Combo system with visual feedback (appears at 3+ consecutive words)
- Power-ups: Slow Time (5 seconds) and Clear All (removes all words)
- High score system (persists in localStorage)
- Real-time HUD showing score, health, level, and high score

**Word Themes:**
- Common English words
- Programming terms
- Mixed mode

**Game Modes:**
- Normal play
- Practice mode
- Daily challenge (UI ready)

**Visual Design:**
- Dark navy background (#1a1b2e)
- White text with neon blue (#00fff5) highlights
- Gradient health bar
- Particle effects on word completion
- Glowing effects on typed portions

**Audio:**
- Soft click sounds on typing
- Pop sound on word completion
- Synthesized using Web Audio API

**Mobile Support:**
- Responsive layout
- Touch-friendly buttons
- Auto-focus on input field

File saved to: `public/typing-rain.html`