The creator of “Blue Lock: Rivals” thought kids on Roblox might like a soccer video game with an anime vibe. It sold a few months later for more than $3 million. The 19-year-old, who asked that his ...

Surrounded by virtual cliffs and a cascading waterfall, dragon riders on Roblox’s massive online gaming platform immerse themselves in a memorable scene from “How to Train Your Dragon.” In the ...