Since a lot of people are asking here is how it was built: Cluade Opus 5 on 'UltraCode', it ran a few hours. I had some back and fourth with it to polish. The assets were generated with: autosprite.io/ Here was the original prompt: We are going to build a large, explorable 3D world with Three.js and Vite. At the center, create a massive castle on a hill that the player can walk toward, enter, and explore. Really focus on making the world feel alive and cinematic. Prioritize detailed lighting, volumetric clouds, dense grass, wind simulation, particle effects, god rays, atmospheric fog, and polished camera effects. The castle should feel AAA-quality, with imposing architecture, a functional drawbridge, outer walls, towers, and a large interior courtyard. Make the entire experience feel cohesive, immersive, and visually incredible.