Yes, virtually all of it. I just made a few tiny tweaks to the HTML just to save a bit of time since so I didn't have to wait on GPT-4's full answer for the tiny change I knew it would make anyway. But the design, layout, coding, back-end high scores, etc is all of GPT-4's own making -- not mine. I didn't tell it how to do anything. I just gave it requests of *what* to do.