The “How to Train Your Dragon” game on Roblox has more than 28 million visits. Over the weekend, the movie raked in $83.7 million in ticket sales in the U.S. and Canada, surpassing expectations.

Roblox will make its upcoming 3D Foundational Model open source—and wants it to see wider adoption across the gaming industry. This means third-party game developers could change the model as ...