Summary
Sabrina Ramonov puts ChatGPT Astra through one of its most demanding tests yet: cloning Minecraft — including mining, crafting, combat, farming, physics, and animals — from a single prompt, with no human intervention during the build. She leaves Astra running while going hiking and returns to document the results.
The build log tells the story in milestones: a functional forest and inventory appear at 15 minutes; log-to-pickaxe crafting works at 20 minutes; a pre-built village called Meadowvale with a cottage, crops, chest, and mine arrives at 45 minutes; water and sand physics drop in at 70 minutes; and by 195 minutes the game supports full survival gameplay including armor, cave lighting, combat with knockback, and crop harvesting with replanting. When mining a plant crashes the game at 20 minutes, Astra diagnoses and fixes it autonomously.
Ramonov also opens the hood on how Astra structured the project: the game runs in JavaScript in-browser, Three.js handles 3D rendering, Rapier manages physics (ensuring dropped items land on surfaces rather than falling through), and Blender — running as an actual app on her computer — generates the blocky character models and pixel textures. Astra pulled existing Minecraft crafting recipe data rather than inventing its own. The result is less about the finished game and more about what it demonstrates: a coding agent capable of multi-hour autonomous iteration across a complex, multi-library technical stack.
📺 Source: Sabrina Ramonov 🍄 · Published September 12, 2026
🏷️ Format: Hands On Build
