# How to Build 3D Worlds with Astra > Source: > Published: 2026-09-07 22:00:00+00:00 Over the last few weeks, I’ve had GPT-6 Astra build a photorealistic 3D Manhattan in Unreal Engine, a 1:1 browser-native replica of the neighborhood I grew up in (complete with a playable zombie survival game), a simulated civilization populated by autonomous agents, among many other experimental builds. Collectively, these experiments have pulled over 15 million views on X. The reaction is almost always the same: *“What’s the prompt?” “There’s no way that’s one shot.” “How did you get it to look like that?”* Unfortunately, there is no silver-bullet prompt... however, the loop is the same every time: Reference→Assets→Assembly→Critique→Ship. Free for subscribers ## The rest of this guide is for subscribers. It’s free. Drop your email and the full method, prompts included, unlocks right here. Every new AI reviewed and every method I actually use, in plain English. **Always free.** Already subscribed? Enter the email you used and it opens instantly. You’re in. The full method is unlocked below. Keep reading.