I'm going to create a complete Wolfenstein 3D-style raycasting engine in a single HTML file, implementing the core rendering loop with ray-casting to generate the 3D perspective view.

I'll build a Wolfenstein 3D style raycasting shooter in a single self-contained HTML file.

I'm checking the rendering logic for potential issues. The column drawing uses putImageData with a dirty rectangle to update only the affected region, and while the image data persists between columns, that's fine since I'm only writing to the specific y-range and updating just that area. The ceiling and floor gradient render first, then walls overwrite via putImageData, which replaces pixels directly without blending—exactly what I need. The sprite shading has some unused code but functions correctly.

Now I should verify the HTML itself has no syntax errors by running it through Node to parse.

Let me verify the JS has no syntax errors:

I'm checking the putImageData call in drawTexColumn — the parameters look correct with dx set to col, dy at 0, and the dirty region spanning from yStart to yEnd, so that should work as intended.

The sprite shading is essentially a no-op which is fine, and while drawing the sprite slice per column with individual drawImage calls across the full width could be expensive, it's acceptable. The overall raycaster logic with FOV tangent calculations and camera handling looks solid, so I think this is ready.

Syntax checks pass. The game is complete in a single self-contained `index.html`. ## What I built A **Wolfenstein 3D–style raycasting maze shooter** — everything (HTML/CSS/JS + all art) is inline in `/workspace/index.html` with zero external resources. **Rendering** - Classic DDA raycaster, one ray per screen column (640 rays), with perpendicular-distance correction to avoid fisheye - Per-column vertical texture mapping into a 1px `ImageData` buffer for speed - Distance + side shading (darker on Y-facing walls and farther surfaces) - Gradient ceiling/floor **Procedural textures** (all generated at runtime, 64×64): 1. Red brick with mortar 2. Blue-grey stone blocks 3. Mossy green panels 4. Riveted metal hazard door **Enemies** - Procedurally drawn guard sprites (idle / shooting / dead frames) - Billboarded with correct camera-space projection and z-buffer occlusion (walls hide enemies) - Simple AI: chase player when in line-of-sight (DDA visibility check), shoot with distance-based hit chance **Gameplay & controls** - **WASD** — move/strafe · **← →** or **mouse** (pointer-lock) — turn - **Click / Space / left-mouse** — shoot (hitscan based on angular target size) - HUD with health bar, ammo, enemy count, score - Muzzle flash, gun bob + recoil kick, red damage flash - Win when all guards are eliminated; lose at 0 HP; start/end overlays with restart You can open `index.html` directly in any browser — no server or network needed.