Minecraft is one of the world’s most popular video games, where players explore, gather resources, craft items and try to survive in a virtual universe constructed of 3D cubes that represent different materials.

The Ender Dragon is the game’s difficult final test. To reach and defeat this dragon, players must complete a long series of connected challenges, such as gathering raw resources, building tools and finding a hidden underground stronghold.

Now, four AI agents have done it, and they only needed one game-specific instruction: “defeat the Ender Dragon.”