Because it is

This impressed me: GPT-5.6 Astra turned Zork (the classic 1977 text adventure) into a full 3D playable action-adventure game It kept the original plot & puzzles, added fight scenes, and built all of the characters & environments directly in Threejs code

There’s all kinds of weird stuff, like being able to move behind the Fireplace or the window “in the corner of the house” being smack dab in the middle of that face of the building.