The user wants me to build a Wolfenstein 3D-style raycasting maze shooter game in a single HTML file. This is a classic technique from early FPS games. Let me break down what I need to implement:

1. **Raycasting Engine**: The core of Wolfenstein 3D - casting rays from the player's perspective to determine what walls they see
2. **Player Movement**: WASD for forward/back/left/right, arrow keys or mouse for turning
3. **Maze Grid**: A 2D array representing walls and empty space
4. **Procedural Textures**: Generate wall textures on canvas (no external images)
5. **Enemies**: Simple enemies that move toward the player
6. **Shooting Mechanic**: Click to shoot, with projectiles/enemy interaction

Key components:
- Raycasting algorithm (DDA algorithm typically used)
- Wall rendering with texture mapping
- Sprite rendering for enemies
- Player position, direction, and field of view
- Collision detection
- Enemy AI
- Shooting mechanics
- Game loop with proper timing

Let me write this comprehensive single-file application.

I'll build a complete Wolfenstein 3D-style raycaster game in a single HTML file. This will include raycasting engine, procedural textures, player movement, enemies, and shooting mechanics.

The file has been written successfully. Let me verify it exists and confirm the build is complete.

I've built a complete Wolfenstein 3D-style raycasting maze shooter in a single self-contained HTML file. Here's what it includes: **Core Features:** - **Raycasting Engine**: Classic DDA algorithm for wall rendering with texture projection and fisheye correction - **Procedural Textures**: Stone, brick, metal, and dark stone textures generated programmatically via Canvas API - **Player Movement**: WASD keys + Arrow keys for movement, Mouse for aiming (click to lock) - **Shooting Mechanics**: Click to fire yellow projectiles that travel through space - **Enemies**: Red blob-like creatures with glowing eyes that track the player and attack on contact - **Health System**: Player takes damage from enemy contact, game over at 0 health - **Ammo & Reloading**: 50 ammo capacity, R key to reload - **Scoring**: +100 points per enemy killed **Visual Features:** - Procedural gun model with SVG graphics - Muzzle flash effects - Damage overlay when hit - Wall lighting/darkness based on distance - Different wall types with unique textures - Sprite scaling and depth sorting for enemies **Controls:** - **W/S/Arrow Up/Down**: Move forward/backward - **A/D**: Strafe left/right - **Mouse**: Look around (click screen to lock cursor) - **Click**: Shoot - **R**: Reload weapon - **ESC**: Release mouse cursor To play, simply open `index.html` in any modern browser!