In just under two months, a Roblox user-created game called Grow a Garden has become a massive hit.

(Bloomberg) -- Brookhaven RP, the most popular title on Roblox Corp.’s video-game service, was sold by its mystery creator to Voldex Entertainment Ltd., a startup that specializes in developing ...

Like YouTube, Roblox started as an online stage for young creators. As the company grows toward 100 million active daily users, contributors are making big money selling games.