A few Roblox players create controversial games inspired by the tragic OceanGate submersible accident, which happened recently.

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.

Inside the buying frenzy turning teenage coders into millionaires--and reshaping Roblox's billion-dollar creator economy.

Whether it serves as a chill escape from the onslaught of the real world or simply a way to beat vacation doldrums, a viral ...