As gaming hits draw tens of millions of simultaneous players, Roblox engineers make sure the internet’s youth never deal with buffering.

Shares of Roblox Corp. surged to a record high on Thursday after the video game maker reported higher user numbers and bookings than analysts had expected.

Right now, AI can only think in three dimensions of static content — text, images, and 3D models. But, Roblox wants to teach AI to produce 4D content that interacts seamlessly with the game ...