It might have, however a ton of gamedev related code (like giving adding physics to an object, and having it explode on contact with something else), is either

It might have, however a ton of gamedev related code (like giving adding physics to an object, and having it explode on contact with something else), is either formulaic, or can be glued together from pieces of other code, a feat ChatGPT is definitely capable of. It doesn't require it to develop a sophisticated model of the problem. And the above applies to a lot of prod code as well.