Unity 3D, the increasingly popular WYSIWYG—ish engine for building video games, does a lot of things really well. Helping you build in-game user interfaces? That’s not one of them. At least, not yet.

Unity, the software company that 70% of mobile games use, is deploying generative AI in games. It’s a massive strategic play that the company’s CEO says will drive similar growth in gaming to the 2D ...